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Even though progesterone is sold as a dietary supplement, it is a hormone, not a food. We recommend that it notbe used except under physician supervision.
Like progestins, true progesterone causes side effects. In one study, oral micronized progesterone at a dose of 400 mg per day was associated with dizziness, abdominal cramping, headache, breast pain, muscle pain, irritability, nausea, fatigue, diarrhea, and viral infections. 1
- Arky R. Physicians' Desk Reference. 53rd ed. Montvale, NJ: Medical Economics; 1999:125.