Fitoeño

Phytoene: A Comprehensive Reference

1. Identity and Chemical Characterization

Chemical Names and Classification

Phytoene (C₄₀H₆₄, systematic name: (6E,10E,14E,16E,18E,22E,26E)-2,6,10,14,19,23,27,31-octamethyldotriaconta-2,6,10,14,16,18,22,26,30-nonaene) is a natural carotenoid and a rarity among naturally synthesized carotenoids, which are tetraterpenoids with a common C40 backbone of isoprenoid units. Phytoene is colourless and has a lower number — three — of conjugated double bonds compared to other coloured carotenoids that have at least ten conjugated double bonds. This structural characteristic is the defining feature that distinguishes phytoene from the majority of the carotenoid family.

As a consequence of this structural feature, among other distinctive physicochemical properties, phytoene's maximum absorption occurs in the ultraviolet region (λ_max of 286 nm in petroleum ether), far away from the wavelengths of 400–550 nm for colored carotenoids causing them to be yellow, orange, or red. Mainly due to its lack of color, which rendered its detection more difficult in the past, the field of phytoene has been largely overlooked in carotenoid research.

Phytoene is often abbreviated as PT or PHY in the scientific literature and is closely related to its immediate metabolic successor, phytofluene (PTF), together forming the class of "colourless carotenoids." The UVR-absorbing colourless carotenoids phytoene and phytofluene are rarities in the carotenoid family and have been largely ignored in studies dealing with food science and technology, nutrition, public health, and cosmetics.

Stereoisomers

Some Z isomers are commonly found in nature; typical examples include (15Z)-phytoene, which is usually the major isomer in carotenogenic organisms. Carotenoids usually occur in nature as all-trans-isomers, but exceptions are known, such as 15-cis-phytoene isolated from carrots, tomatoes, and other organisms.

2. Natural Sources and Biosynthetic Origin

Biosynthesis

The classical structure of tetraterpenes (C40) includes an initial skeleton formation in phytoene, which involves the coupling of two geranylgeranyl diphosphate (GGPP) molecules, with its sequence analogous to those observed in triterpenes and squalene. The first committed step that determines the flux in the carotenoid pathway is the synthesis of phytoene catalyzed by phytoene synthase (PSY).

In the subsequent steps, the production of all-trans-lycopene from 15-cis-phytoene involves four enzymes: phytoene desaturase (PDS), ζ-carotene isomerase (ZISO), ζ-carotene desaturase (ZDS), and carotenoid isomerase (CRTISO). Phytoene is stepwisely desaturated to form lycopene via phytofluene, ζ-carotene, and neurosporene by phytoene desaturase. Lycopene is the main pigment that accumulates in red tomato fruits but, in most other plant tissues, lycopene is further modified into carotenoid molecules with cyclic end groups, such as α or β carotene, which can in turn be converted into molecules containing oxygen moieties (the xanthophylls).

Food Sources

Phytoene is present in common foods of Western diets — including tomatoes, red grapefruits, watermelon, apricot, carrots, some peppers, cantaloupe, banana, melon, some citrus, avocado, nectarine, and peach — as well as in foods less common in the diet such as caja, buriti, mamey, marimari, physalis, gac, rosehips, and fruits of Acrocomia aculeata.

The natural cellular levels of phytoene from different sources vary over a wide range. Among the most commonly known carotenoid-rich food sources, tomatoes contain the highest phytoene content (~5 mg/kg fresh weight). Lycopene occupies the largest portion, about 80–90%, of the carotenoids in ripe tomatoes, followed by β-carotene and phytoene.

Algae are another potential source of the colourless carotenoids. The halotolerant marine microalga Dunaliella salina is one of the richest sources of natural carotenoids (up to 10% dry weight), the majority of which is β-carotene. Recent research constitutes a relatively new area which has emerged from phytoene's importance as a precursor of colored carotenoids but also as a major dietary carotenoid found in widely consumed foods such as tomatoes, oranges, red peppers, grapefruits, and carrots.

The fungus Blakeslea trispora has also been identified as a microbial producer of phytoene. Bioprocess kinetics optimized by response surface methodology have revealed maximum phytoene content of 5.02 mg/g dry biomass and yield of 203.91 mg/L culture medium, comparable or even higher than those reported for other potent phytoene microbial producers.

3. Traditional and Historical Use

Phytoene as a discrete, chemically identified compound is a product of modern analytical chemistry, and there is no documented tradition of its use as an isolated substance in historical or ethnobotanical medicine. The compound was not characterised chemically until the mid-twentieth century, and its dietary significance was not recognised until the late 1990s onward.

However, phytoene is naturally present in foods — particularly tomatoes, carrots, and citrus — that have been consumed across many cultures throughout recorded history. Recent comprehensive reviews have indicated that phytoene and phytofluene are major dietary carotenoids found in widely consumed products, including tomatoes, carrots, citrus, and derivatives, and are readily bioavailable, being present as major carotenoids in plasma, human milk, skin, and other tissues. The traditional use of tomatoes in Mediterranean cuisine, carrots across Asia and Europe, and tropical fruits in South American and African diets would have provided substantial unrecognised dietary phytoene exposure, though historical populations would have associated any perceived health benefits with the whole food rather than with this specific compound.

It is very important to revisit the studies finding associations about tomato consumption and health benefits, as these are very often attributed to lycopene and not to the presence of phytoene and phytofluene, among other bioactives. The isolation and commercial concentration of phytoene into supplement and cosmeceutical formulations is a twenty-first-century development, reflecting the maturation of carotenoid analytical science.

4. Common Forms and Preparations

In modern dietary supplement and nutricosmetic applications, phytoene is available in several standardised forms:

• Tomato-derived extracts: Phytoene products sourced from tomatoes have been commercialised in the cosmetic industry, such as PhytoflORAL® (Frutarom Industries Ltd., Herzliya, Israel). The source for phytoene and phytofluene, a tomato powder rich in colourless carotenoids and poor in strongly coloured carotenoids, namely PhytoflORAL®, has been used as the test material in clinical studies.
• Yellow tomato extract (standardised): Lumenato is a standardised, solvent-free yellow tomato extract. Applications of the products include soft gels, liquid-filled capsules, powder beverages, gummies, and nutritional bars.
• Microalgae-derived extracts: Extracts from two microalgae, Chlorella sorokiniana and Dunaliella bardawil, contain high levels of phytoene, and these phytoene-rich extracts have protective effects similar to pure phytoene.
• Topical preparations: Short- and long-term human in vivo skin compatibility studies with phytoene- and phytofluene-rich tomato and Dunaliella salina alga extracts have shown a lack of irritancy or sensitisation reactions, supporting the safe use of phytoene- and phytofluene-rich products in human topical applications.

5. Key Constituents and Mechanisms of Action

Phytoene as a Biosynthetic Precursor

Phytoene is the product of the first committed reaction of carotenogenesis, but a series of redox reactions normally converts it to carotenes rapidly. In organisms or food matrices where this desaturation is incomplete or inhibited, phytoene can accumulate substantially. Plastoquinone mimics have been used successfully to induce the accumulation of phytoene in plant or algal cells; they bind competitively to the plastoquinone binding site of phytoene desaturase (PDS) and block phytoene desaturation.

UV-Absorption Properties

One of phytoene's most chemically significant and physiologically relevant characteristics is its absorption in the ultraviolet range. Dietary interventions of colourless carotenoids, phytoene and phytofluene, according to their distinct structural and biological actions, maximise the absorption of damaging light in the ultraviolet range, unlike coloured carotenoids that have maximum absorption in the visible range. This UV-absorbing capacity gives these molecules a physicochemically direct rationale for photoprotection that coloured carotenoids (such as lycopene and β-carotene) do not possess to the same degree.

Antioxidant Activity

The mechanisms by which carotenoids can be beneficial are not only antioxidant; there is also evidence that they can be prooxidants, enhance gap-junction cell communication, and modulate gene expression. For phytoene specifically, antioxidant activity has been attributed to its ability to quench reactive oxygen species. Phytoene may directly scavenge free radicals and promote the production of other scavengers, thus preventing oxidative damage.

Anti-Inflammatory Activity

Phytoene and phytofluene are biologically very active, exhibiting anti-inflammatory, antioxidant, and anticarcinogenic properties both in vitro and in vivo. For instance, these carotenoids can act either additively or synergistically with CoQ10 to lower the production of inflammatory mediators in UV-irradiated or IL-1-stimulated human dermal fibroblast cell cultures, and they can protect CoQ10 from degradation.

Anti-Cancer and Antiproliferative Activity

Phytoene's potential biological actions include antioxidant, anti-inflammatory, and anti-carcinogenic activity, as well as UVR-induced damage protection. More specifically, phytoene and phytofluene could participate in antioxidant and anti-inflammatory actions, decrease DNA damage in lymphocytes, and protect against skin and other tissue damage.

Role in the Carotenoid Biosynthetic Network

GGPP and phytoene are in the pathway for biological synthesis of all C₄₀ carotenoids such as beta-carotene and zeaxanthin, so that the genes encoding enzymes for preparing GGPP and phytoene, and GGPP and phytoene themselves, are also useful in the synthesis of all carotenoids, including beta-carotene and zeaxanthin.

6. Bioavailability in Humans

Phytoene and phytofluene are readily absorbed from tomato foods and tomato extracts by humans. Animal models of carotenoid absorption suggest preferential accumulation of phytoene and phytofluene in some tissues.

There is compelling evidence that the largely overlooked colourless carotenoids phytoene and phytofluene are major dietary carotenoids and readily bioavailable. Their intakes as well as levels in foods and human samples are comparable and sometimes higher than those of the carotenoids commonly studied in the context of agro-food and health (lutein, zeaxanthin, β-cryptoxanthin, α-carotene, β-carotene, and lycopene).

A cross-sectional and dietary intervention study in Spanish adults (n = 101 for the observational arm; n = 29 for the intervention arm; age range 45–65 years) reported specific plasma levels. This study aimed to assess phytoene and phytofluene concentrations in serum from healthy Spanish normolipemic subjects; serum and faecal concentrations were analysed by HPLC and dietary intake by 3 × 24-hour recalls. Phytoene showed higher concentrations than phytofluene in serum, faeces, and in dietary intake. Phytoene concentrations in serum were 0.16 ± 0.07 µmol/L, in faeces 17.7 ± 20.3 µg/g, and in dietary intake the median was 2.4 mg/person/day. Carrots and tomatoes were the major dietary contributors of these carotenoids.

Typically, phytoene levels in plasma are in the 0.1–1.0 µM range. Concentrations of these carotenoids in plasma increased when phytoene-rich foods were ingested, while the restriction of such foods or the intake of foods with a low content in these carotenoids caused a decrease of their concentration in plasma, with phytoene decreasing faster than phytofluene.

The post-prandial absorption of phytoene in humans has been directly demonstrated in a clinical study using tangerine tomato juice. Post-prandial absorption of 44.9 mg phytoene found in substantial concentrations in tangerine tomato juice was documented. The unique carotenoid profile of tangerine tomatoes allowed investigators to study the post-prandial absorption of phytoene, phytofluene, ζ-carotene, and neurosporene into chylomicrons in humans.

7. Scientific Evidence by Health Area

7.1 Skin Health and Photoprotection

The most extensively studied application for phytoene is photoprotection of the skin. Attention has been focused on the colourless UV radiation (UVR)-absorbing dietary carotenoids phytoene and phytofluene, which are attracting increased interest in food science and technology, nutrition, health, and cosmetics. These compounds are major dietary carotenoids, readily bioavailable, and have been shown to be involved in several health-promoting actions. The growing evidence that these unique UVR-absorbing carotenoids with distinctive structures and properties can be beneficial in these contexts has been highlighted.

Clinical evidence: A clinical study — described as an open intra-individual study conducted at Dermscan Poland (January to April 2013) — evaluated the photoprotective effects of oral supplementation with PhytoflORAL®, a tomato powder rich in phytoene and phytofluene. The study showed that daily intake of these carotenoids protects the skin from UV radiation by increasing the Minimal Erythemal Dose (MED) and the skin's natural resistance to UV-induced erythema. Skin quality was reportedly improved in 55–95% of the volunteers (clinical and subjective assessment). The study provides direct evidence that dietary supplements containing a tomato powder rich in the colourless carotenoids phytoene and phytofluene can help protect the skin against UV damage, providing a significant photoprotective effect. One subject suffered from possibly product-related headaches. The number of subjects was too small for a full assertion of the effect and a further study with more subjects was advised.

A double-blind, randomised, placebo-controlled trial of tomato phytonutrients (containing phytoene alongside phytofluene and lycopene) is referenced by Groten et al. (Skin Pharmacol Physiol, 2019). Tomato phytonutrients balance UV response: results from a double-blind, randomized, placebo-controlled study (Skin Pharmacol Physiol, 2019; 32:101–8). Additionally, supplementation with tomato-based products has been shown to increase lycopene, phytofluene, and phytoene levels in human serum and protect against UV-light-induced erythema. This finding was documented in the International Journal of Vitamin and Nutrition Research (Aust O, Stahl W, Sies H, Tronnierr H, Heinrich U).

The results of four pre-clinical and three human clinical trials highlight the bioavailability of key phytonutrients including phytoene and phytofluene in blood plasma in as little as two weeks.

Evidence strength: Preliminary to moderate. Several clinical and mechanistic studies support photoprotection; however, many trials used combined phytoene/phytofluene/lycopene preparations, making it difficult to attribute effects solely to phytoene.

7.2 Antioxidant and Anti-Inflammatory Effects

The antioxidant and anti-inflammatory potential of phytoene has been demonstrated in cell culture and preclinical models. In addition to skin health, the distinct chemical structures and biological actions of phytoene and phytofluene are attributed to antioxidant, anti-inflammatory, and anticancer activities.

In vitro, phytoene has been shown to act synergistically with other endogenous antioxidants. These carotenoids can act either additively or synergistically with CoQ10 to lower the production of inflammatory mediators in UV-irradiated or IL-1-stimulated human dermal fibroblast cell cultures, and they can protect CoQ10 from degradation.

Evidence strength: Largely in vitro and preclinical. Human evidence specifically attributing anti-inflammatory effects to phytoene as an isolated compound is limited.

7.3 Cancer — Preclinical and Epidemiological Evidence

Beyond their role as vitamin A precursors, carotenoids intervene in important biological actions that can contribute to reducing the risk of diverse diseases — including cancer, cardiovascular disease, skin, bone, eye, and metabolic disease — and may be beneficial in relation to cognition and early development.

A large population-based incident case-control study examined dietary carotenoid intake and breast cancer risk. Results showed that higher intake of lycopene, phytoene, phytofluene, total non-provitamin A and provitamin A, β-carotene, and lutein/zeaxanthin were associated with outcomes in breast cancer risk assessment. A study on colorectal cancer has also been referenced in the literature: a preliminary assessment of the protective and antitumour effects of phytoene-containing bacterial and microalgal extracts in colorectal cancer was published in 2025.

Phytoene has been shown in cell culture to inhibit growth of specific human cancer cell lines. Acyclic carotenoids and their oxidation mixtures inhibit the growth of HL-60 human promyelocytic leukemia cells (Nutr Cancer, 2001). Phytoene, phytofluene, and lycopene from tomato powder differentially accumulate in tissues of male Fisher 344 rats (Nutr Res, 2007).

Evidence strength: Preliminary; primarily cell culture and animal data. Human epidemiological evidence on phytoene specifically is sparse and confounded by co-ingestion with other carotenoids from the same food sources.

7.4 Ageing and Neuroprotection

A significant 2024 study published in Antioxidants examined phytoene's effects using the model organism Caenorhabditis elegans. Although present at high concentrations across different tissues, phytoene has been largely viewed as not having physiological activity. However, this study demonstrated that phytoene is bioactive and has anti-ageing properties. Supplementation with phytoene protects against oxidative damage and amyloid-β₄₂ proteotoxicity — a major pathology of Alzheimer's disease — and extends lifespan.

The study also examined extracts from two microalgae, Chlorella sorokiniana and Dunaliella bardawil. The extracts contain high levels of phytoene, and the phytoene-rich extracts have protective effects similar to pure phytoene. The findings show that phytoene is a bioactive molecule with positive effects on ageing and longevity, and the work suggests that phytoene-rich microalgae extracts can be utilised to produce foods or supplements that promote healthy ageing and prevent the development of chronic age-related diseases.

Specifically, in the worm model, amyloid-β42 buildup leads to progressive paralysis. Animals given phytoene showed a clear delay in this effect, indicating protection against protein aggregation, one of the hallmarks of Alzheimer's disease.

These results corroborate earlier research showing better health outcomes linked to higher carotenoid-rich food consumption like tomatoes. However, they also raise the question as to whether the conventional view holding lycopene responsible is correct, or whether lycopene is simply a marker for other phytochemicals — including phytoene — that bring about this effect.

Evidence strength: Preclinical only (invertebrate model organism). No human trials on phytoene for neuroprotection or longevity have been published as of this writing; extrapolation from C. elegans to human outcomes requires great caution.

7.5 Ocular Health

Natural carotenoids have been reported to reduce the risks of cataracts, macular degeneration, neurodegeneration, and some cancers because of their strong antioxidant capacity. Phytoene, as one of the major dietary carotenoids measurable in human tissue, is hypothesised to contribute to these benefits alongside better-studied compounds such as lutein and zeaxanthin; however, dedicated human clinical evidence for phytoene specifically in ocular disease has not yet been established.

Evidence strength: Inferential; phytoene is present in human tissues affected by ocular disease, but it has not been independently tested in human trials for eye health.

7.6 Metabolic and Hepatic Effects

Preclinical animal research has investigated phytoene's role in metabolic contexts. Carotenoids including phytoene have been studied in relation to metabolic disease. One referenced animal study examined tomato extract supplementation (containing phytoene among other carotenoids) against high-fat diet-induced hepatic lesions, though direct human metabolic evidence for phytoene as an isolated compound remains absent.

Evidence strength: Animal data only; no human clinical evidence for isolated phytoene in metabolic or hepatic endpoints.

8. Body Systems Associated with Phytoene

• Integumentary system (skin): The best-supported application. Phytoene is a natural component of human skin, suggesting a physiological role in photoprotection. Its UV-absorbing and antioxidant properties are relevant to photoprotection, anti-ageing, and skin tone.
• Immune system: Anti-inflammatory effects have been demonstrated in fibroblast and lymphocyte models in vitro.
• Neurological system: Emerging preclinical evidence points to neuroprotective and anti-ageing effects in model organisms, with particular interest in Alzheimer's disease pathology.
• Oncological context: Preliminary cell-culture and epidemiological evidence suggests a possible role in reducing cancer risk, particularly in cancers associated with oxidative stress and inflammation.
• Ocular system: Phytoene is present in human ocular tissues but lacks independent human trial evidence for eye health outcomes.
• Hepatic/metabolic system: Preclinical evidence only; no established human evidence.

9. Dosage Forms and Reported Dosages

No standardised recommended daily intake or therapeutic dose for phytoene has been established by any regulatory authority, including the NIH Office of Dietary Supplements, EFSA, or WHO. The following figures are drawn directly from published research:

• Habitual dietary intake (observational, Spain): Phytoene concentrations in serum were 0.16 ± 0.07 µmol/L, in faeces 17.7 ± 20.3 µg/g, and in dietary intake the median was 2.4 mg/person/day.
• Single-dose study (tangerine tomato juice): Post-prandial absorption was studied following a dose of 44.9 mg phytoene from tangerine tomato juice.
• Supplement forms available: Pre-clinical and human clinical trials on Lumenato (a standardised yellow tomato extract) documented bioavailability of phytoene in blood plasma in as little as two weeks. Applications include soft gels, liquid-filled capsules, powder beverages, gummies, and nutritional bars.

For topical applications, short- and long-term compatibility studies have been conducted with phytoene- and phytofluene-rich tomato and Dunaliella salina extracts applied to human skin. The specific concentrations used in these formulations are not publicly reported in the peer-reviewed literature reviewed here.

10. Safety Considerations

General Safety Profile

The colourless carotenoids phytoene and phytofluene are comparatively understudied compounds found in common foods (e.g., tomatoes) and in human plasma, internal tissues, and skin. Being naturally present in common foods, their intake at dietary levels is not expected to present a safety concern.

Cytotoxicity and Genotoxicity

In vitro cytotoxicity and genotoxicity studies have revealed no significant cytotoxic or genotoxic potential of phytoene- and phytofluene-rich extracts, and short- and long-term human in vivo skin compatibility studies with phytoene- and phytofluene-rich tomato and Dunaliella salina alga extracts showed a lack of irritancy or sensitisation reactions. These results support the safe use of phytoene- and phytofluene-rich products in human topical applications.

Human Tolerability

In the open intra-individual clinical study of an oral tomato powder supplement (PhytoflORAL®), study subjects found their skin more resistant to sun damage, more beautiful, and visibly younger and healthier; the supplement was globally well tolerated with no relevant cutaneous side effects. A single subject suffered from possibly product-related headaches.

Carotenodermia

Because phytoene is colourless — in contrast to coloured carotenoids such as β-carotene — it is not associated with the skin yellowing (carotenodermia) that can occur with high-dose supplementation of coloured carotenoids. This is a structural consequence of its limited chromophore.

Absence of Established Drug Interactions

Since the interest in phytoene in the context of many applications is expanding, it is important to conduct studies aimed at assessing their safety. As of the currently available literature, no specific drug-phytoene interactions have been identified in peer-reviewed human studies. Given phytoene's lipophilic nature and absorption via the same chylomicron pathway as other dietary carotenoids and fat-soluble nutrients, interactions with lipid-lowering agents (such as bile acid sequestrants) that reduce fat-soluble nutrient absorption are plausible by class analogy, but have not been specifically documented for phytoene in human studies.

Regulatory Status

Phytoene derived from tomato sources has been considered within the scope of EFSA's opinions on lycopene oleoresin from tomatoes. The EFSA Panel on Dietetic Products, Nutrition and Allergies also provided an opinion on the safety of a lycopene oleoresin from non-GM high-lycopene tomatoes. This product contained lycopene along with phytoene as a constituent. A standardised yellow tomato extract (Lumenato) received novel food approval in certain jurisdictions as of late 2025.

11. Research Gaps and Current Limitations

Evidence about phytoene's health-promoting biological actions continues to be produced. Nevertheless, several important gaps remain:

• The majority of human clinical evidence involves combined carotenoid preparations (phytoene plus phytofluene plus lycopene from tomato matrices), making it impossible in most studies to attribute outcomes specifically to phytoene.
• No large-scale, long-term, placebo-controlled randomised clinical trials have been conducted using isolated phytoene as the sole intervention in any health domain.
• Human pharmacokinetic data on pure phytoene (absorption kinetics, tissue distribution, half-life, and metabolic fate) are limited; most bioavailability data come from food matrix studies.
• There is no established Dietary Reference Intake, Tolerable Upper Intake Level, or standardised therapeutic dose for phytoene from any major regulatory body.
• Mainly due to its lack of color, which rendered its detection more difficult in the past, the field of phytoene has been largely overlooked in carotenoid research, creating an evidence base that lags behind that of other carotenoids by decades.
• Neuroprotective and longevity findings are exclusively from an invertebrate model organism (C. elegans) and have not been replicated in mammalian systems or human trials.

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