Scordinin

Scordinin: A Reference Article

1. Identity and Natural Source

Botanical Origin

Scordinin is a naturally occurring compound isolated from garlic (Allium sativum L. and the closely related species Allium scorodoprasum L.), bulbous plants of the family Amaryllidaceae. Allium sativum L. (garlic) belongs to the family Amaryllidaceae, has been originated in Asia, and is also widely cultivated in Egypt, Mexico, China, and Europe. The genus name scorodo- (from Greek skorodon, garlic) is directly reflected in the compound's name, and the species identifier scorodoprasum refers to the "garlic leek," indicating the broader Allium context from which scordinin was first studied.

Chemical Identity and Nomenclature

Scordinin was historically identified in Japanese phytochemical research as a biologically active, non-odoriferous constituent of garlic distinct from allicin. Bactericidal action and side effects such as blood poisoning have been noticed concerning allicin, which causes the penetrating smell in garlic; on the other hand, scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects. It represents a chemically distinct fraction from the volatile thiosulfinates (such as allicin) that are responsible for garlic's characteristic odor and pungency.

The chemical investigation of scordinin was reported in a series of Japanese studies from the 1960s and 1970s. A key publication indexed on PubMed—"Studies on biological active component in garlic (Allium scorodoprasm L. or Allium sativum). II. Chemical structure of scordinin A1"—represents one of the earliest attempts at full structural elucidation of the scordinin A1 sub-fraction. Further work by Kominato, Nishimura, and Takeyama examined related subfractions: Kominato Y., Nishimura S., and Takeyama K. (1976) reported "Studies on biologically active components in garlic (Allium sativum): II. Thiamin-retaining effects of scordinin A, B mixture and antibacterial activities of the scordinin decomposition products." A Japanese patent (Kominato, 1970) was also filed relating to scordinines A and B from garlic. Kominato K. (1970) filed a Japanese patent on "Scordinines A and B from garlic."

Scordinin is thus understood as a family of related compounds (scordinin A, scordinin B, and sub-fractions such as scordinin A1) rather than a single, fully characterized molecular entity with a single IUPAC name widely accepted in contemporary chemical databases. No methods for scordinin assay in such preparations had been presented previously; as an index substance for the assay, lactic acid—a fixed quantity of which formed after alkaline hydrolysis of scordinin—was chosen. This analytical finding (that alkaline hydrolysis yields lactic acid as a quantifiable marker) points to the complex, ester-containing nature of the scordinin molecule(s).

Research on the "biologically active component in garlic (Allium scorodoprasum L. or Allium sativum)" encompassed the "thiamine retaining effects of scordinin A, B mixture and antibacterial activities of scordinin A1's decomposition product." This demonstrates that scordinin exists as a mixture of at least two related fractions (A and B), each with differing properties, and that decomposition products of scordinin A1 exhibit their own antibacterial activity.

In contemporary supplement science, scordinin is characterized as a sulfur-containing compound concentrated in aged or odorless garlic preparations. It is structurally related to, but distinct from, the major organosulfur compounds of garlic such as allicin, alliin, ajoene, diallyl sulfide (DAS), diallyl disulfide (DADS), diallyl trisulfide (DATS), S-allylcysteine (SAC), and S-allylmercaptocysteine (SAMC). Sulfur-containing compounds such as alliin, allicin, ajoenes, vinyldithiins, and sulfides are the main constituents isolated from A. sativum extracts.

Common Forms and Preparations

Scordinin is concentrated through the aging and processing of garlic. Aged garlic extract (AGE) is produced by aging raw garlic (Allium sativum L.) in an alcoholic solution for more than 10 months. During this extended aging process, the volatile, odoriferous compounds such as allicin are either absent or greatly reduced, while more stable sulfur constituents including scordinin accumulate. Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities; for this purpose, scordinin has been widely added to tonic-nourishing health food supplements. Supplement products made from odorless or aged garlic preparations are the primary commercial vehicles for scordinin.

The development of an enzymatic assay method for scordinin in commercial health food preparations was published in the Nippon Eiseigaku Zasshi (Japanese Journal of Hygiene) in 1980, documenting the use of a lactate dehydrogenase (LDH)-based system to quantify the compound. No methods for scordinin assay in such preparations had been presented previously; as an index substance for the assay, lactic acid—a fixed quantity of which formed after alkaline hydrolysis of scordinin—was chosen, and the contents in the hydrolyzate were determined by LDH to convert them into scordinin. The assay procedure involved alkaline hydrolysis followed by ultracentrifugation to remove interfering particles. Samples equivalent to 50 mg of scordinin were hydrolyzed in a 10% sodium hydroxide solution, neutralized with hydrochloric acid, and ultracentrifuged at 12,000G; enzymatic assay of the contents were then converted into scordinin in the sample using a conversion formula.

2. Traditional and Historical Use

Garlic as the Broader Ethnobotanical Context

Because scordinin is a constituent of garlic, its traditional use context is inseparable from the millennia-long history of garlic use across major civilizations. Garlic (Allium sativum) has been integral to human culture and medicine for more than 5,000 years, serving as both a culinary staple and therapeutic agent; ancient cultures including those of Egypt, Greece, China, Persia, Sumer, and India recognized its antimicrobial, cardiovascular, and immune-enhancing properties, integrating garlic into diets, rituals, and medicinal practices.

In the Ebers Papyrus (around 1500 BC), various medicinal plants were mentioned, among others the much-appreciated garlic, described as efficient in healing 32 illnesses. The pharaoh Tutankhamun (1320 BC) was sent on his journey to the afterlife accompanied by garlic; archaeologists have discovered garlic bulbs in the pyramids.

There is evidence that during the earliest Olympics, which originated in Greece, garlic was fed to the athletes before they competed, conceivably functioning as one of the first so-called "performance-enhancing" agents used in competitive athletics. Hippocrates, widely regarded as the father of medicine, made garlic a part of his therapeutic armamentarium, advocating its use for pulmonary complaints, as a cleansing or purgative agent, and for abdominal growths.

By or before 2000 BC, garlic was in wide use in China and formed part of the daily diet, particularly when consumed together with raw meat; records dating from that era suggest that garlic was also used in combination therapy, and fatigue, headache, and insomnia were often treated with garlic. In ancient Indian medicine, garlic was a valuable remedy used as a tonic, roborans, to cure a lack of appetite, common weakness, cough, skin disease, rheumatism, and haemorrhoids; in the Vedas—the Indian holy book—garlic was mentioned among other medicinal plants.

In traditional Chinese medicine, garlic is prepared and served in different forms such as syrup, extract, decoct, garlic oil, tincture, and infusion, and they are exploited for their medicinal benefits in the treatment of several diseases such as food poisoning, cholera, fever, headache, dysentery, and for lowering blood pressure, and as a stimulant, diuretic, expectorant, and diaphoretic agent. Specific preparation methods, such as fermentation and aging, contributed to the therapeutic versatility of garlic, as observed in black garlic traditions.

In many cultures, garlic was administered to provide strength and increase work capacity for laborers. This historical use as a tonic and stamina-promoter is directly relevant to scordinin's later scientific characterization as the garlic constituent associated with such tonic properties.

Scordinin's Specific Traditional Role in Japanese Health Food Culture

The identification of scordinin as a discrete compound and its promotion as a tonic constituent is particularly associated with Japan. Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects; for this purpose, scordinin has been widely added to tonic-nourishing health food supplements. The existence of an assay paper published in the Japanese Journal of Hygiene in 1980 specifically to measure scordinin in "commercial tonic preparations" demonstrates that by the late 1970s and early 1980s, scordinin was already an established ingredient in Japan's health food supplement industry. Application of the present method to some commercial tonic preparations proved that the method was satisfactorily effective.

The connection of scordinin to the thiamine (vitamin B1) retention activities of garlic, documented in the 1976 Kominato–Nishimura–Takeyama study on the scordinin A, B mixture, links scordinin to Japan's broader mid-twentieth century research interest in garlic–thiamine interactions and the development of fat-soluble thiamine derivatives (allithiamine). Studies on biologically active components in garlic reported thiamin-retaining effects of the scordinin A, B mixture and antibacterial activities of the scordinin decomposition products.

3. Key Constituents and Active Compounds in Garlic — Context for Scordinin

Garlic (Allium sativum) is widely consumed as a natural prophylactic worldwide and produces more than 200 identified chemical compounds, with more than 20 different kinds of sulfide compounds. Scordinin represents one class of these compounds, specifically associated with the non-volatile, odorless fraction.

The broader category of garlic organosulfur compounds to which scordinin belongs can be understood as follows. The bioactivity of garlic is primarily attributed to various organosulfur compounds (OSCs), such as reactive thiosulfinates like allicin, lipid-soluble allyl sulfides and polysulfides (e.g., diallyl sulfide, diallyl disulfide, diallyl trisulfide), and water-soluble derivatives present in aged garlic extract (AGE), notably S-allyl-L-cysteine (SAC) and S-allyl-mercaptocysteine (SAMC). Scordinin is classified with the non-odoriferous, aged-preparation-associated fraction rather than with allicin or the volatile allyl sulfides.

Sulfur-containing compounds from A. sativum are derivatives of S-alkenyl-l-cysteine sulfoxides, ajoene molecules, thiosulfinates, sulfides, and S-allylcysteine. The scordinin fractions are structurally distinct from these well-characterized species, with the alkaline hydrolysis product of lactic acid pointing toward a more complex ester or lactate-containing backbone not common to the mainstream allyl-sulfide compounds.

Scordinin A, B Fractions and Decomposition Products

As documented in primary literature, scordinin exists as at least two major fractions—scordinin A and scordinin B. Scordinin A was further resolved into sub-fractions including scordinin A1, for which a chemical structure was reported (PubMed PMID 5363289, study published circa 1965). The "thiamine retaining effects of scordinin A, B mixture and antibacterial activities of scordinin A1's decomposition product" were reported in Japanese-language research by Kominato, Nishimura, and Takeyama. This decomposition product retains antibacterial activity, distinguishing it from the intact scordinin molecule.

Relationship to Thiamine (Vitamin B1) Metabolism

One of the most historically documented properties of scordinin is its thiamine-related activity. The 1976 study by Kominato, Nishimura, and Takeyama specifically examined the thiamine-retaining effects of the scordinin A and B mixture. Studies by Kominato, Nishimura, and Takeyama on biologically active components in garlic reported thiamin-retaining effects of the scordinin A, B mixture and antibacterial activities of the scordinin decomposition products. Garlic sulfur compounds in general are known to form complexes with thiamine: allicin reacts with thiamine to form allithiamine, a fat-soluble thiamine analog with enhanced bioavailability. The scordinin fractions' thiamine-retaining capacity suggests a structural or biochemical interaction with this B-vitamin pathway, though the precise mechanism for scordinin specifically has not been independently replicated in modern peer-reviewed literature.

4. Mechanisms of Action Associated with Scordinin and Its Parent Preparations

Because dedicated mechanistic studies on purified scordinin compounds are sparse in the contemporary peer-reviewed literature, much of what is proposed about its mechanisms draws on (a) the earlier Japanese studies describing its biological activities, and (b) broader research on the garlic organosulfur compound class to which it belongs. The following mechanisms are those directly attributed to scordinin or to the non-odoriferous, aged garlic fraction within which scordinin has been the characterized active principle.

Antilipemic (Lipid-Lowering) Activity

Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects; for this purpose, scordinin has been widely added to tonic-nourishing health food supplements. The antilipemic designation indicates a proposed capacity to reduce blood lipid levels, which is consistent with the general cardiovascular benefits ascribed to garlic preparations. For the broader class of garlic organosulfur compounds, aged garlic extract contains various biologically active sulfur-containing amino acids such as S-allylcysteine (SAC), S-1-propenylcysteine (S1PC), and S-allylmercaptocysteine (SAMC), which have been demonstrated to lower hypertension, improve atherosclerosis, and enhance immunity through their anti-inflammatory and antioxidant activities.

Tonic and Stamina-Promoting Effects

The designation of scordinin as the "main tonic principle active in garlic used in health foods" is the explicit framing of the 1980 Japanese Journal of Hygiene paper. Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects. The "cell generating" (or cell-proliferative) property attributed to scordinin suggests a growth-promoting or regenerative mechanism, which aligns with its historical use in physical performance and recovery contexts.

Thiamine-Retaining and Thiamine-Like Activity

The thiamine-retaining effect attributed to the scordinin A and B mixture implies that scordinin may interact with thiamine at a biochemical level—either by forming a stable complex with it (analogous to how allicin forms allithiamine) or by protecting thiamine from degradation, thus effectively increasing the bioavailability or functional availability of vitamin B1. The structural relationship between garlic sulfur compounds and thiamine was a significant area of Japanese pharmacological research in the mid-twentieth century. Studies on biologically active components in garlic examined the thiamin-retaining effects of the scordinin A, B mixture. No independent modern studies have confirmed or extended this proposed mechanism.

Antibacterial Activity of Decomposition Products

Distinct from intact scordinin, its decomposition product—specifically from scordinin A1—retains antibacterial activity, as documented in the same Japanese research series. The study on "biologically active component in garlic (Allium scorodoprasum L. or Allium sativum)" investigated "thiamine retaining effects of scordinin A, B mixture and antibacterial activities of scordinin A1's decomposition product." This is analogous to allicin, whose decomposition products (ajoene, vinyldithiins, allyl sulfides) also retain distinct biological activities. Allicin, a thiosulfinate compound, has been identified as a key contributor to garlic's antimicrobial activity; furthermore, diallyl trisulfide (DATS) and ajoene, organosulfur derivatives of allicin, have demonstrated antimicrobial efficacy in previous studies.

Immunomodulatory and Antioxidant Effects (Aged Garlic Fraction Context)

Glutathione and aged garlic extract are sulfur-containing products that play important protective and regulatory roles within the immune system and in oxidative processes. Recent studies have shown that sulfur-containing compounds from garlic have beneficial effects in attenuating outcomes associated with cardiovascular disease and inflammation by a mechanism that may be related to the H₂S signaling pathway. Scordinin, as part of the aged/odorless garlic extract, is incorporated into the broader biological context of these mechanisms, though it has not been isolated and tested in its own right in contemporary immunological studies.

5. Scientific Evidence by Area of Use

Important methodological note: The available primary peer-reviewed evidence specifically on scordinin as an isolated, purified compound is limited to a small number of Japanese studies from the 1960s–1980s (notably those by Kominato, Nishimura, and Takeyama), several of which are available only in Japanese-language journals and are cited by subsequent secondary sources. No modern randomized controlled trials (RCTs) or systematic reviews specifically on scordinin have been identified in contemporary databases. The evidence base for the health areas described below therefore draws on: (1) primary scordinin-specific studies, where available; and (2) the broader evidence for the aged/odorless garlic preparations of which scordinin is a marker constituent, clearly labeled as such.

5.1 Lipid-Lowering / Cardiovascular Effects

Scordinin-specific evidence: The antilipemic property is noted as one of scordinin's "useful biological activities" in the Japanese Journal of Hygiene paper (1980), but no clinical trial data on scordinin per se are available in accessible peer-reviewed databases.

Broader aged garlic extract evidence: The bioactivity of garlic is primarily attributed to various organosulfur compounds (OSCs); these compounds exhibit antimicrobial, antihypertensive, antithrombotic, anticancer, antidiabetic, and neuroprotective properties. Human clinical trials on aged garlic extract (of which scordinin is a characterized constituent) have examined cardiovascular endpoints. Aged garlic extract contains various biologically active sulfur-containing amino acids such as SAC, S1PC, and SAMC, which have been demonstrated to lower hypertension, improve atherosclerosis, and enhance immunity through their anti-inflammatory and antioxidant activities.

Evidence strength: For scordinin specifically — weak; based on historical characterization in Japanese literature, no modern RCTs. For aged garlic extract broadly — moderate, supported by multiple human trials, though study quality varies.

5.2 Tonic / Physical Performance / Anti-Fatigue Effects

Scordinin-specific evidence: The identification of scordinin as the primary "tonic principle" in garlic health foods is explicitly stated in the 1980 Japanese Journal of Hygiene paper. Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects; for this purpose, scordinin has been widely added to tonic-nourishing health food supplements. No independent clinical trial data on scordinin's tonic or anti-fatigue effects in human subjects have been identified in accessible English-language peer-reviewed databases.

Historical garlic evidence: There is evidence that during the earliest Olympics, garlic was fed to the athletes before they competed, conceivably functioning as one of the first so-called "performance-enhancing" agents used in competitive athletics. In many cultures, garlic was administered to provide strength and increase work capacity for laborers.

Evidence strength: For scordinin specifically — very weak; limited to historical characterization and traditional use descriptions, with no modern clinical trials identified. For garlic broadly in physical performance — preliminary, with the historical evidence not constituting clinical proof.

5.3 Thiamine-Related / Metabolic Effects

Scordinin-specific evidence: The thiamine-retaining effects of the scordinin A, B mixture were investigated by Kominato, Nishimura, and Takeyama (1976). Studies on biologically active components in garlic reported thiamin-retaining effects of the scordinin A, B mixture and antibacterial activities of the scordinin decomposition products. The precise nature of this thiamine retention (whether it increases bioavailability, protects from degradation, or forms an allithiamine-like complex) is not clearly elucidated in available English-language summaries of the original Japanese study.

Evidence strength: Preliminary and dated; based on a single research series from the 1970s with no modern replication identified.

5.4 Antibacterial / Antimicrobial Effects

Scordinin-specific evidence: The decomposition product of scordinin A1 was reported to exhibit antibacterial activity. Research documented "antibacterial activities of scordinin A1's decomposition product." This is consistent with the wider antimicrobial properties of garlic sulfur compounds, where enzymatic or chemical degradation generates active antimicrobial species.

Broader garlic antimicrobial evidence: Garlic offers a wide range of health benefits, particularly its notable antibacterial and antifungal properties, largely attributed to its diverse sulfur-containing compounds; among these, allicin, a thiosulfinate compound, has been identified as a key contributor to garlic's antimicrobial activity. Despite these promising findings, robust evidence from randomized controlled trials evaluating garlic's antimicrobial efficacy in humans remains limited.

Evidence strength: For the scordinin A1 decomposition product — preliminary, based on the original Japanese research series; no modern in vitro or in vivo confirmation identified separately. For garlic broadly — RCT evidence limited.

5.5 Cell-Generating / Proliferative Effects

Scordinin has been described as possessing "cell generating effects" in the 1980 Japanese Journal of Hygiene paper. Scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities including antilipemic and cell-generating effects. The term "cell generating" in this context likely refers to a mitogenic or proliferation-supporting action, which in the mid-twentieth century Japanese literature may have related to observed effects on growth promotion. No modern in vitro, in vivo, or clinical studies specifically characterizing this mechanism of scordinin have been identified in accessible databases.

Evidence strength: Very weak; a descriptive claim from a 1980 assay methodology paper, with no supporting mechanistic studies identified in the contemporary literature.

5.6 Oral/Periodontal Health

This evidence relates to the aged garlic extract fraction, not specifically to scordinin per se. It was reported that the administration of AGE alleviated gingivitis in a clinical trial; to gain insight into this effect of AGE, it was examined whether AGE and the sulfur compounds SAC, S1PC, and SAMC influence the effects of TNF-α in inducing ICAM-1 expression and IL-6 secretion in Ca9-22 human gingival epithelial cells.

Evidence strength: Preliminary; single randomized clinical trial on AGE broadly; not specific to scordinin.

6. Body Systems and Health Areas Associated with Scordinin

• Cardiovascular system: Antilipemic effects are the most consistently cited biological activity for scordinin in the original Japanese literature. The broader aged garlic extract literature supports cardiovascular benefits including blood pressure reduction, antiplatelet activity, and anti-atherosclerotic effects. Garlic organosulfur compounds exhibit antimicrobial, antihypertensive, antithrombotic, anticancer, antidiabetic, and neuroprotective properties.
• Metabolic / energy metabolism: Thiamine-retaining properties of scordinin A and B link it to carbohydrate metabolism and energy production, given thiamine's (vitamin B1's) indispensable role in glucose metabolism and energy generation.
• Immune system: Aged garlic extract plays important protective and regulatory roles within the immune system and in oxidative processes. Scordinin as a component of aged garlic preparations is associated with this immunomodulatory context.
• Physical performance / musculoskeletal: The historical designation of scordinin as a "tonic" and its connection to physical stamina and anti-fatigue uses link it to musculoskeletal performance and recovery, though clinical evidence is absent.
• Antimicrobial (non-systemic): The antibacterial activity of scordinin A1 decomposition products suggests relevance to infection defense, consistent with garlic's broader antimicrobial reputation.
• Gastrointestinal system: Experimental evidence demonstrated that the sulfur-free compound aged garlic extract protects the intestinal mucosa in experimental mice. Scordinin, as a non-odoriferous component of such preparations, is consistent with this protective context.

7. Dosage Forms and Reported Dosages

No dedicated dose-finding clinical trials specifically investigating scordinin have been identified in accessible peer-reviewed databases. The dosage information available relates to the preparations in which scordinin is a characterized constituent.

Analytical standard quantity: In the 1980 enzymatic assay methodology paper, samples equivalent to 50 mg of scordinin were hydrolyzed in a 10% sodium hydroxide solution, neutralized with hydrochloric acid, and ultracentrifuged at 12,000G for assay purposes; this is an analytical quantity, not a clinical dose.

Aged garlic extract context: The aged garlic extract (AGE) product profile published in a patent document shows that the "AGE" product contains primarily the water-soluble compounds S-allylcysteine (SAC, 0.62 mg/g) and SAMC (0.14 mg/g), but it also contains lesser amounts of the lipid-soluble compounds diallyl sulfide, triallyl sulfide, and diallyl disulfide (DADS). Scordinin is not separately quantified in this profile. The total amount of sulfur compounds is 2.14 mg/g.

Supplement preparations: Commercial odorless garlic products specifically promoted for scordinin content are typically aged 18 months and are described as concentrated to yield high amounts of scordinin, though the precise per-dose scordinin content is not stated in available peer-reviewed sources and is not reproduced here from retail or marketing sources.

Consistent with the broader AGE research literature, aged garlic extract is produced by aging raw garlic in an alcoholic solution for more than 10 months. This extended processing is required for scordinin-enriched preparations, distinguishing them from fresh garlic products.

8. Safety Considerations and Interactions

No dedicated safety or toxicology studies specifically on isolated scordinin are available in the accessible peer-reviewed literature. Safety data derive from the broader garlic and aged garlic extract literature, with the following factual observations documented in scientific sources.

General Tolerability of Garlic Preparations

Research studies have established that while garlic is deemed safe when consumed in moderation amounts, therapeutic doses may induce gastrointestinal distress, and excessive quantities have been linked to liver harm.

Odorlessness as a Distinguishing Safety Feature

The non-odoriferous character of scordinin was explicitly contrasted with allicin in the Japanese literature: bactericidal action and side effects such as blood poisoning have been noticed concerning allicin, which causes the penetrating smell in garlic; on the other hand, scordinin, which is not odoriferous in garlic, is said to carry out many useful biological activities. This framing implies that scordinin-enriched, odorless preparations were viewed in the Japanese health food industry as offering the beneficial properties of garlic without allicin's associated toxicological profile. However, no systematic comparative safety study has been identified.

Gastrointestinal Mucosa

Upon oral ingestion, dehydrated raw garlic powder damages the stomach mucosa promptly; however, experimental mice's intestinal mucosa is protected by the sulfur-free compound aged garlic extract. Aged preparations (the primary vehicle for scordinin) appear to have a more favorable mucosal safety profile than raw or dehydrated garlic.

Platelet and Anticoagulant Interactions

Anticoagulant and fibrinolytic properties, in addition to a significant decrease in platelet production and conflicting effects on fibrinolytic effectiveness, have been documented in garlic, as reported in prior studies. These effects are attributed to garlic's organosulfur compounds broadly; preparations containing scordinin (aged garlic extract) share this class context. Individuals taking anticoagulant or antiplatelet medications should be aware of this established pharmacological interaction of garlic compounds.

Drug Metabolism (CYP450)

For individual aged garlic extract compounds, pharmacokinetic characterization is available. A pharmacokinetic study of S-1-propenylcysteine (S1PC) — a related aged garlic extract compound — revealed that S1PC was readily absorbed after oral administration in rats and dogs with bioavailability of 88–100%; additionally, S1PC had little inhibitory influence on human cytochrome P450 activities, even at a concentration of 1 mM. No equivalent CYP450 data have been published for purified scordinin.

Evidence Limitations

The scordinin-specific literature is limited primarily to Japanese-language studies from the 1960s through the early 1980s, with the most accessible peer-reviewed source being the 1980 enzymatic assay paper in the Japanese Journal of Hygiene. The compound does not feature in major pharmacopeial monographs (e.g., WHO monographs on garlic focus on allicin and alliin), in NIH Office of Dietary Supplements fact sheets, in Cochrane reviews, or in ESCOP/Commission E monographs as a separately characterized entity. The broader garlic and aged garlic extract literature provides a mechanistic and clinical context, but extrapolating those findings directly to scordinin requires caution, as the contribution of scordinin versus other AGE constituents (SAC, SAMC, S1PC) to observed effects has not been separately quantified in clinical research.

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