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ergosterol| Substance that, under the action of the Sun's ultraviolet rays on the skin, gives rise to the production of vitamin D2 – a vitamin that helps in calcium and phosphorus metabolism, promotes bone formation, and in children prevents rickets. |
| Ergosterol C28H43OH is a sterol that occurs in ergot (hence the name), yeast and other fungi, and some animal fats. The principal source of commercial ergosterol is yeast. |
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