Precursor
Medical term · P
A substance that the body can convert into the active form of a vitamin. One example is beta carotene, which the body can convert into vitamin A as needed.
Related terms
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Beta caroteneA richly colored compound (red, yellow, or orange) found in many plants, fruits, and vegetables that the body can convert into vitamin A.
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Actinic keratosisScaly pink or red-brown raised spots or patches on the skin caused by overexposure to the sun. Actinic keratosis may be a precursor to skin cancer.
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Angiotensin IAn inactive form of the protein angiotensin. It is the precursor to the active form, angiotensin II.