Is soy in supplements good or bad for you?

Answer:

Soy and compounds isolated from soy (including soy isoflavones and soy protein) may be included in supplements for health benefits, such as reducing menopausal symptoms, lowering cholesterol, or increasing bone density. Soy constituents (including soy lecithin or soy oil) may also be included in supplements as inactive ingredient/excipient or as a source of certain vitamins. For most people, soy and its constituents are considered safe. However, people with certain conditions — including soy allergy, certain types of breast cancer or a family history of breast cancer, prostate cancer, and those with thyroid conditions — may need to avoid certain soy constituents.

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