Methionine Methylsulfonium Chloride (Vitamin U): A Comprehensive Reference
1. Identity, Nomenclature, and Physical Characteristics
S-methylmethionine (SMM; also referred to in the literature as methylmethionine sulfonium chloride, MMSC, and "vitamin U") is a methylated derivative of the essential amino acid methionine and belongs to the class of sulfonium compounds. Though often referred to as Vitamin U, it is not a true vitamin but rather a sulfur-containing compound derived from methionine, an essential amino acid.
The compound carries a variety of synonymous chemical and common names in the scientific and commercial literature. These include: DL-methionine methylsulfonium chloride, S-methylmethionine sulfonium chloride, methyl-methionine sulphonium chloride, DL-methylmethionine sulfoniumchloride, S-methyl-DL-methionine-sulfoniumchloride, and (3-amino-3-carboxypropyl)dimethylsulfonium chloride.
The L-form (the biologically relevant enantiomer) carries the CAS number 3493-12-7 and has the molecular formula C₆H₁₄ClNO₂S, with a molecular weight of 199.70. In its pure form it appears as a white crystal or white crystalline powder with a pH of 4.0 to 5.0 in solution. The compound is hygroscopic in nature. The racemic DL-form carries the separate CAS number 63889-27-0. DL-methionine methylsulfonium (DL-MMSC), a racemic mixture, has been used in research to study its mechanism of protection against gastric ulceration.
Vitamin U is a highly active compound but may not have any essential function in the body. The name "Vitamin U" is given to MMSC as a molecule with many biological activities, but it does not have a confirmed essential function and is not currently accepted as a true vitamin.
2. Natural Sources and Distribution
MMSC is widespread in nature in flowering plants and vegetables. S-methyl-methionine (SMM) is commonly found in plants such as cabbage, broccoli, wheat, and sunflowers.
Quantitative analysis of SMM content across a wide range of food plants has been conducted. Investigation of the content of S-methylmethionine (SMM) in the extracts of 53 plant and 13 animal products using an ion exchange clean-up procedure followed by two-dimensional thin layer chromatography found that the richest plant SMM sources (in mg/100 g) are cabbage (53–104), kohlrabi (81–110), turnip (51–72), tomatoes (45–83), celery (38–78), leeks (66–75), garlic-leaves (44–64), beet (22–37), raspberries (27), and strawberries (14–25). Animal products are poor in SMM.
Within the cabbage plant itself, distribution is uneven. The level of SMM is highest in the middle parts of leaves including midribs, and the level of vitamin U is dependent on the part of the plant sample. Research on the effects of cooking methods has shown that cabbage contains high levels of SMM (192.85 mg/100 g dry weight) compared to other cruciferous vegetables, and blanching cabbage leaves for one to ten minutes decreases glucosinolate and SMM levels, whereas microwaving or steaming cabbage for 5–10 minutes preserves glucosinolate and SMM levels.
Storage conditions also significantly affect SMM content. Storage of plants rich in SMM for six months showed average decreases of: celery 38%, kohlrabi 39%, turnip 43%, and leeks 32%. Storage of cabbage at uncontrolled temperatures resulted in a decrease of 62%, while cold storage at 0–1°C reduced SMM by 34%.
3. Biosynthesis and Plant Biochemistry
S-methylmethionine arises in plants via the methylation of methionine by S-adenosyl methionine (SAM), with the coproduct being S-adenosyl homocysteine. Vitamin U (DL-methionine methylsulfonium chloride) is a natural methionine-derivative found as an active component in the methionine cycle of plants where it serves as a substrate for methyl transferases.
Although its biological role in plants is not well understood, SMM is known to preserve methionine, serve as a methyl donor, and regulate S-adenosylmethionine (SAM). Microbial production of SMM has also been explored: introducing a plant-derived MMT gene encoding methionine S-methyltransferase into engineered Saccharomyces cerevisiae sake K6 allowed microbial production of S-methyl-methionine.
4. Traditional and Historical Use
The modern scientific history of MMSC begins in the mid-twentieth century, though the use of cabbage-based preparations for gastrointestinal complaints has older antecedents. The use of cabbage to treat peptic ulcers dates back to at least the 1940s, when Dr. Garnett Cheney at Stanford University published clinical studies in the 1940s and 1950s demonstrating that fresh cabbage juice, rich in S-methylmethionine, could accelerate the healing of peptic ulcers, including duodenal ulcers.
The term "Vitamin U" was coined in 1950 by Garnett Cheney for uncharacterized anti-ulcerogenic factors in raw cabbage juice that may help speed healing of peptic ulcers. Dr. Cheney was of the opinion that peptic ulcers resulted from a deficiency of a nutritional factor he termed Vitamin U, later identified as the amino acid S-methylmethionine.
Cheney conducted a series of progressively larger clinical observations. The therapeutic use of vitamin U in the form of cabbage juice in the treatment of a group of thirteen patients was reported in 1949, and a further report dealing with the clinical use of this form of therapy was made in 1950; a subsequent report consisted of an analysis of the therapeutic effect of vitamin U in cabbage juice on the healing of peptic ulcer in 100 patients (including the 13 originally reported upon) treated over a period of two-and-a-half years.
Vitamin U is a synonym for methylmethionine sulfonium chloride. It is an important natural factor in raw cabbage juice that supports gastric health. In Japan, it is used in over-the-counter pharmaceutical preparations, and it is recognized in the Japanese Pharmaceutical Codex and the Japanese Pharmacopoeia as an official medicinal substance.
In Japan, peptic ulcer disease is treated clinically with a combination of a mucosal protectant and acid suppressants, and the effects of MMSC as part of such combination therapy have been formally investigated.
5. Key Constituents and Chemical Nature
MMSC is itself the active ingredient rather than an extract containing multiple constituents. It is a derivative of L-methionine and a naturally occurring sulfonium compound found in a large number of plants. Its unique chemical feature is the presence of a positively charged sulfonium group, which distinguishes it from simple methionine and gives it distinctive biological reactivity.
In humans, SMM participates in one-carbon (methyl group) transfer reactions. SMM serves as a substrate for the BHMT2 enzyme and participates in the protection of the liver from acetaminophen-induced toxicity through regulation of methionine and glutathione metabolism. Its relationship to the broader one-carbon metabolic network means it intersects with homocysteine, glutathione, and S-adenosylmethionine pathways.
6. Established and Proposed Mechanisms of Action
6.1 Gastric Cytoprotection
Oral administration of methylmethionine sulfonium stimulates healing of ischemia-induced acute gastric mucosal injuries in rats without suppression of acid secretion, indicating a cytoprotective rather than an antisecretory mechanism of action.
SH-containing endogenous substances and exogenous molecules such as methylmethionine-sulfonium chloride (MMSC) prevent mucosal damage due to their ability to absorb and neutralize free radicals released in xenobiotic-triggered cell damage, inhibit TNF-α expression, reduce the aspirin-induced leukocyte-endothelium adhesion, and stimulate mucin release.
The augmentation of mucin production has been directly studied in isolated gastric cells. MMSC was shown to inhibit ethanol-induced gastric mucosal damage and increase the amount of surface mucin in rats; a subsequent study examined whether MMSC augmented mucin secretion and changed the distribution of mucin vesicles ultrastructurally in mucous cells using primary cultured mucous cells from rabbit glandular stomach, and also investigated changes in intracellular cyclic AMP (cAMP) and cytosolic free Ca²⁺ levels.
6.2 Antioxidant and Free Radical Scavenging Activity
Vitamin U (S-Methylmethionine sulfonium) chloride is an orally active anti-ulcer agent with antioxidant activity. SMM has also exhibited protective effects against valproic acid-induced hepatotoxicity, primarily through its free radical scavenging properties.
6.3 Anti-inflammatory Activity
Tests conducted on mice demonstrated that methylmethionine-sulfonium chloride (vitamin U) is capable of lowering the permeability of skin capillaries following the action of stimulants, and it greatly potentiates the antiphlogistic (anti-inflammatory) effect of acetylsalicylic acid, this action being more pronounced with vitamin U administered one hour before intake of acetylsalicylic acid. Given in a dose of 1000 mg/kg, vitamin U helps reduce exudation in aseptic serositis in rats, and its antiphlogistic effect comes in conjunction with its ability to exercise a protective action against lesion of the gastric mucosa produced by acetylsalicylic acid.
6.4 Wound Healing and Fibroblast Activation
SMMS is a derivative of the amino acid methionine synthesized in a variety of plants and is widely referred to as vitamin U because of its potent therapeutic effect on gastrointestinal ulceration; skin wounds are accompanied by mucosal erosion and share similar histopathological aspects with gastric ulcers, making it plausible that SMMS may promote skin wound healing. Single SMMS treatment was sufficient to promote the growth of human dermal fibroblasts (hDFs) as well as their migration, which are indispensable steps for skin wound healing; the promotion of hDF proliferation and migration resulted from considerable activation of ERK1/2 by SMMS.
6.5 Methyl Donor Activity
SMM is known to preserve methionine, serve as a methyl donor, and regulate S-adenosylmethionine (SAM). This positions MMSC within the broader one-carbon metabolism network, potentially supporting methylation-dependent processes including DNA methylation, neurotransmitter synthesis, and detoxification reactions, though direct clinical evidence for these downstream effects in humans remains limited.
7. Scientific Evidence by Area of Use
7.1 Peptic Ulcer Disease and Gastric Mucosal Protection
This is the most extensively studied area and the foundation of MMSC's clinical reputation.
Early clinical observations (1949–1956): Thirteen patients with peptic ulcer were treated with fresh cabbage juice, which experiments had indicated contains an antipeptic ulcer factor (vitamin U) that prevents the development of histamine-induced peptic ulcers in guinea pigs. The average crater healing time for seven of these patients who had duodenal ulcer was only 10.4 days, while the average time reported in the literature for 62 patients treated by standard therapy was 37 days. The average crater healing time for six patients with gastric ulcer treated with cabbage juice was only 7.3 days, compared with 42 days as reported in the literature for six patients treated by standard therapy.
Controlled trial at San Quentin Prison: A clinical study was undertaken to evaluate the effectiveness of concentrated cabbage juice in the treatment of peptic ulcers. Patients with a diagnosed ulcer crater were treated in a double-blind control experiment, given either concentrated cabbage juice or a placebo facsimile. The evaluation of the merit of this treatment was based upon repeated x-ray examinations of the ulcer crater. A period of 22 days was allowed for ulcer crater healing time, and the results of this experiment indicated concentrated cabbage juice to be effective in healing of peptic ulcer.
More recent clinical evidence: Drozdov et al. (2023) demonstrated that the daily administration of 300 mg of a dietary supplement containing SMM significantly alleviated the severity of dyspeptic symptoms in patients with chronic gastritis.
A study designed to evaluate the effect of methylmethionine sulfonium chloride (vitamin U) intake on the symptoms of dyspepsia and the quality of life of patients with chronic gastritis included 37 patients (21 men and 16 women) aged 35–60 years with chronic gastritis of various etiologies. All patients were prescribed S-methylmethionine at a dose of 300 mg per day, and clinical manifestations of dyspepsia were assessed using the GSRS questionnaire, while quality of life was assessed using the SF-36 questionnaire.
In experimental models, MMSC prevented the ethanol-induced gastric mucosal damage, stimulated mucin release and its redistribution on the gastric mucosal surface; and in clinical trials, MMSC effectively facilitated remission in duodenal ulcer.
In a separate double-blind study of hematemesis treatment caused by erosive gastritis, patients receiving cysteine or MMSC demonstrated more stable hemodynamic parameters and the absence of recurrent bleeding.
Evidence strength: Cheney's studies are historically significant but were conducted before modern randomized controlled trial standards; they lacked full blinding in the earlier series and used small patient numbers. The San Quentin study used a double-blind design. Modern evidence remains limited. Well-designed Phase II randomized controlled trials and innovative pharmaceutical formulations are urgently needed to translate preclinical promise into clinical benefits.
The accumulated data on the effectiveness of vitamin U allow consideration of it as an adjunct to the main therapy of gastritis and ulcers in order to increase efficiency, as well as a means to prevent exacerbations.
7.2 Lipid Metabolism and Hypolipidemic Effects
The hypolipidemic and anti-atheromatous effect of MMSC were investigated using various experimental procedures. In the results, orally administered MMSC markedly normalized dietary-induced hyperlipidemia in rats and rabbits, demonstrating lowering effects on plasma total cholesterol, beta-lipoprotein, and phospholipids, with no appreciable effect on plasma triglycerides. In normolipidemic and surfactant-induced hyperlipidemic rats, MMSC did not decrease plasma lipid levels.
In a human clinical study, oral administration of L-MMSC resulted in a statistically significant decrease of serum total cholesterol (9.7%, P < 0.001), but not of serum triglycerides; statistically significant increases in serum high-density lipoprotein (HDL) were also reported.
Effects of MMSC on aminonucleoside-induced nephrotic hyperlipidemia in rats were investigated. Repeated oral administration of MMSC at a dose of 1000 mg/kg daily exhibited significant amelioration of plasma cholesterol and phospholipid levels, and the treatment improved nephrotic syndrome itself by producing an increase of urinary volume and a decrease of urinary protein excretion. The results suggest that MMSC may be useful as single or combined therapy for human nephrotic syndrome and its related hyperlipidemia.
Evidence strength: The human evidence for hypolipidemic effects is limited to a small number of studies, several of which are not modern controlled trials. Animal data is more extensive. Vitamin U has beneficial effects on lipid metabolism; a daily dose of 1,500 milligrams has been reported to reduce total blood cholesterol levels, with beneficial changes in HDL levels also noted. These human findings require confirmation in larger, adequately powered trials.
7.3 Wound Healing and Skin Repair
In animal models, topical administration of SMMS to both physical and chemical wounds facilitated wound closure and promoted re-epithelialization compared with a control. Single SMMS treatment was sufficient to promote the growth of human dermal fibroblasts (hDFs) as well as their migration, which are indispensable steps for skin wound healing. It was concluded that SMMS facilitated the repair process of skin damage by activation of dermal fibroblasts, suggesting that SMMS has potential as a skin wound-healing agent.
Evidence strength: Evidence for wound healing is primarily from in vitro human cell experiments and animal models. No large-scale controlled human clinical trials for topical wound healing have been identified in the peer-reviewed literature.
7.4 Photoprotection
SMMS has been investigated for photoprotective effects. SMMS increased the viability of keratinocyte progenitor cells (KPCs) and human dermal fibroblasts (hDFs) following UVB irradiation, reduced UVB-induced apoptosis in these cells, increased phosphorylation of extracellular signal-regulated kinases (ERK), and attenuated UVB-induced reactive oxygen species (ROS) generation in KPCs and hDFs.
SMMS induced collagen synthesis and reduced the matrix metalloproteinase-1 (MMP-1) expression in UVB-irradiated hDFs. In animal studies, application of 5% and 10% SMMS before and after UVB irradiation significantly decreased the UVB-induced erythema index and depletion of Langerhans cells.
Researchers have also sought to develop odor-improved derivatives for cosmetic use. SMMS confers wound-healing and photoprotective effects on the skin, suggesting its use as a cosmetic raw material; however, it has an unpleasant odor, and odor-free SMMS derivatives were synthesized by eliminating dimethyl sulfide.
Evidence strength: Photoprotective evidence is based on in vitro cell studies and animal experiments published in peer-reviewed journals (International Journal of Molecular Sciences, PMC). Human clinical trials demonstrating topical photoprotection have not yet been reported.
7.5 Hepatoprotection
Protective effects of SMMS in valproic acid-induced liver and kidney injury have been reported. Findings from such investigations show that Vitamin U prevents liver damage caused by valproic acid (VPA) through increasing antioxidant enzyme capacity and hepatocyte proliferation by triggering inflammation and apoptosis-related pathways.
Similar antioxidant and hepatoprotective effects of SMM have been demonstrated in models of valproate-induced liver injury. Historically derived from observations of antiulcer activity in plant-derived foods, SMM has been studied in preclinical models and limited clinical settings for its multilevel pharmacological effects.
Evidence strength: Hepatoprotective evidence is derived from animal models and in vitro studies. Controlled human data is lacking for this indication.
7.6 Adipogenesis Inhibition
S-methylmethionine sulfonium chloride was originally studied for its inhibition of ulceration in the digestive system. Vitamin U is ubiquitously expressed in the tissues of flowering plants, and while there have been reports on its hypolipidemic effect, its precise function remains unknown. Research has been conducted to evaluate the anti-obesity effect of vitamin U in 3T3-L1 pre-adipocyte cell lines. Vitamin U inhibits adipocyte differentiation in such in vitro models.
Evidence strength: Inhibition of adipocyte differentiation has been demonstrated in pre-adipocyte cell line models only. No human clinical evidence for anti-obesity effects has been established.
7.7 Antitumor Activity
The adverse effects of radiotherapy and chemotherapy are increasing the need to investigate alternative medicine to improve cancer cell response to treatment. Research has investigated the ameliorative effect of S-methyl methionine sulphonium chloride against hepatocellular carcinoma (HCC) induced in albino rats through the reduction of lipid peroxide, inflammatory cytokines, and GP3 expression. MMSC has shown effective activity against liver cancer in mammalian studies. Liver cancer is often resistant to chemotherapy and cannot be removed by surgery; MMSC has potential as a natural molecule that could help in treatment. However, no human studies have proven its effectiveness.
Evidence strength: Limited to animal and in vitro studies. Not established in human clinical trials.
7.8 Radioprotection
Earlier research has explored radioprotective properties. Radioprotective effects of S-methylmethionine (vitamin U) were reported in applied biochemistry and microbiology. This area of investigation is older and not currently supported by modern clinical evidence.
8. Body Systems and Health Areas Associated with MMSC
A review of the pleiotropic pharmacological effects of MMSC highlights important pharmacological protective effects for various organs, including the stomach, liver, kidneys, skin, eyes, and brain.
- Gastrointestinal system: The primary area of historical and ongoing research; gastric ulcer, duodenal ulcer, gastritis, erosive mucosal lesions.
- Liver: Hepatoprotective effects studied in drug-induced hepatotoxicity models.
- Kidneys: Renal protection studied in models of drug-induced nephrotoxicity and nephrotic syndrome.
- Skin: Wound healing, photoprotection, and collagen synthesis.
- Cardiovascular/metabolic: Lipid-lowering effects investigated in humans and animal models.
- Immune and oxidative stress: Antioxidant, anti-inflammatory, and TNF-α modulating effects.
The most consistently reported properties include gastroprotective and antiulcer effects, as well as antioxidant, anti-inflammatory, cytoprotective, and regenerative activities observed predominantly in preclinical studies; particular attention has been paid to organ-specific protection in the nervous system, liver, kidneys, lungs, skin, eyes, and oral tissues, although human evidence remains scarce.
9. Dosage Forms and Dosages Reported in Studies
Oral tablets and capsules: The most common dosage form used in clinical and pharmacological research. In a clinical study in 37 patients with chronic gastritis, all patients were prescribed S-methylmethionine at a dose of 300 mg per day. Daily administration of 300 mg of a dietary supplement containing SMM was also used in a demonstration that significantly alleviated dyspeptic symptoms in patients with chronic gastritis.
A daily dose of 1,500 milligrams has been reported to reduce total blood cholesterol levels in studies examining lipid effects.
In animal studies, doses have generally been considerably higher on a weight basis. In rat studies of nephrotic hyperlipidemia, repeated oral administration of MMSC at a dose of 1,000 mg/kg daily was used. In anti-inflammatory animal experiments, vitamin U was given at a dose of 1,000 mg/kg to reduce exudation in aseptic serositis in rats.
Fresh cabbage juice: In the 1940s and 1950s, Dr. Garnett Cheney had his peptic ulcer patients drink one liter of fresh cabbage juice every day to heal stomach and duodenal ulcers. In one of Cheney's better-known studies, a quart of raw cabbage juice was administered to 100 patients with a peptic ulcer, and within two to five days, major improvements were seen in the number of cases experiencing an end to ulcer pain.
Topical preparations: In animal studies, application of 5% and 10% SMMS before and after UVB irradiation was used for photoprotection experiments. In animal wound-healing models, topical administration of SMMS for a given period of time facilitated wound closure and promoted re-epithelialization.
Japanese OTC pharmaceutical use: Vitamin U is recognized as an important natural factor in raw cabbage juice that supports gastric health, and in Japan it is used in over-the-counter pharmaceutical preparations.
Since MMSC is not accepted as a vitamin, no dosage or recommended dietary allowances have been prescribed. Consuming it in food in any amount is considered probably safe.
10. Combination with Conventional Therapy
In Japan, peptic ulcer disease is treated clinically with a combination of a mucosal protectant and acid suppressants. Rats given the combination of famotidine plus MMSC were compared with controls, famotidine-only, and MMSC-only groups in a study examining effects on gastric mucus cells over seven days of treatment.
Though research on Vitamin U declined after the rise of more potent pharmaceutical treatments like proton pump inhibitors (PPIs), it remains of interest in natural medicine and gastrointestinal health formulas due to its non-toxic profile.
11. Safety Considerations
Despite the relatively small number of research studies, the notable antioxidant and anti-inflammatory properties of MMSC, along with its extensive range of target organs and tissues and its low toxicity, position it as a promising candidate for the development of novel medicines.
S-methylmethionine (methylmethionine sulfonium chloride), better known as vitamin U, is a metabolic substrate that affects many metabolic processes in the human organism. Since its discovery, a large number of studies has been produced demonstrating its safety and effectiveness in various diseases, especially in diseases of the gastrointestinal tract.
Odor: One notable practical issue with MMSC formulations concerns its odor. SMMS has an unpleasant odor attributable to dimethyl sulfide; researchers have synthesized odor-free SMMS derivatives by eliminating the dimethyl sulfide component for use in cosmetic applications. This is relevant to both dietary supplement palatability and topical formulation development.
Stability: As noted in natural source sections, MMSC is thermolabile and is significantly degraded by boiling or blanching, which has implications for dietary delivery via food sources.
Absence of essential function classification: Vitamin U is a highly active compound but may not have any essential function in the body. It is not currently accepted as a true vitamin, does not have a confirmed essential function, and carries no established recommended dietary allowance.
Drug interactions: MMSC greatly potentiates the antiphlogistic effect of acetylsalicylic acid, an interaction observed in animal experiments. Whether this interaction is clinically relevant in humans at supplemental doses has not been formally studied. No well-characterized drug interaction studies in humans were identified in the peer-reviewed literature.
Overall evidence limitations: Narrative reviews critically evaluating the available evidence on SMM's pharmacological actions across organ systems note that it covers gastroprotective and antiulcer effects as well as antioxidant, anti-inflammatory, cytoprotective, and regenerative activities observed predominantly in preclinical studies. Well-designed Phase II randomized controlled trials and innovative pharmaceutical formulations are urgently needed to translate preclinical promise into clinical benefits.
References
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