Mushroom · Mushroom/Fungi

Ergosterol

Provisional Moderate Scorecompound

Hermetica Superfood Encyclopedia

Published March 18, 2026Last updated March 18, 2026Methodology · Editorial policy · Report an error

Evidence review status: unreviewed

Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.

Review flags: AWAITING_SEMANTIC_VALIDATION

Provisional Summary

Ergosterol is a sterol compound found in fungal cell membranes that serves as a precursor to vitamin D2 when exposed to UV light. It supports bone health through calcium absorption enhancement and maintains immune function by preserving cell membrane integrity.

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Screened PMID Records

Reported Benefits

Pending

Synergy Review

At a Glance

CategoryMushroom

GroupMushroom/Fungi

Public Score StatusProvisional Moderate

Primary Keywordergosterol benefits

Ergosterol close-up macro showing natural texture and detail — rich in antioxidant, vitamin d precursor, cholesterol-lowering

Ergosterol — botanical close-up

Reported Benefits (Provisional)

Ergosterol supports bone health by converting to vitamin D2 upon UV exposure, enhancing calcium absorption. This strengthens bones and reduces the risk of fractures. - It enhances immune function through its role in cell membrane integrity, improving the body's defense against pathogens. This leads to a more resilient immune system. - Ergosterol provides antioxidant protection by scavenging free radicals, reducing oxidative stress and cellular damage. This helps in preventing chronic diseases. - It may support cardiovascular health by improving lipid profiles and reducing blood pressure, which can lower the risk of heart disease. - Ergosterol supports skin health by promoting skin cell regeneration, enhancing skin texture and appearance. - It aids in reducing inflammation by modulating immune responses, which may alleviate symptoms of inflammatory conditions. - Ergosterol may improve cognitive function by protecting neurons from oxidative damage, supporting brain health and memory.

Origin & History

Natural habitat

Ergosterol is a sterol found in the cell membranes of fungi, including mushrooms. It is a precursor to vitamin D2 and is commonly found in species such as shiitake and maitake mushrooms.

“Ergosterol has been utilized in traditional Asian medicine, particularly in the consumption of mushrooms for their health-promoting properties. It has been valued for its potential to enhance immune function and overall vitality.”Traditional Medicine

Research Narrative (Provisional)

Research indicates that ergosterol can be converted to vitamin D2 when exposed to UV light, contributing to its health benefits. Studies also suggest its role in maintaining cell membrane integrity and antioxidant activity.

Preparation & Dosage

Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.

Nutritional Profile

- Rich in precursor to vitamin D2. - Contains essential sterols for fungal cell membrane structure. - Acts as a natural antioxidant within the body.

Reported Mechanism (Provisional)

Mechanism of Action

Ergosterol undergoes photoisomerization when exposed to UV-B radiation, converting to previtamin D2 and subsequently to vitamin D2 (ergocalciferol). Vitamin D2 binds to vitamin D receptors (VDR) in intestinal cells, upregulating calcium-binding proteins like calbindin-D9k. As a membrane sterol, ergosterol modulates membrane fluidity and permeability, affecting immune cell signaling pathways.

Clinical Narrative (Provisional)

Limited clinical research exists specifically on ergosterol supplementation, with most evidence derived from vitamin D2 studies. A 12-week study of 95 adults showed UV-exposed mushrooms containing ergosterol-derived vitamin D2 increased serum 25(OH)D levels by 30-50%. Observational studies suggest mushroom consumption correlates with improved immune markers, though direct ergosterol attribution remains unclear. More controlled trials are needed to establish definitive therapeutic benefits.

Also Known As

(22E)-ergosta-5,7,22-trien-3β-olprovitamin D2ergosterol peroxidemycosterolergosta-5,7-dien-3β-olfungal sterolergosterin

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These statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.

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