The recommended amount for adults is 5 mg per day. Even larger amounts (up to 10 grams) seem to be safe for some people. But taking larger amounts increases the chance of having side effects such as diarrhea.
RDA: The Recommended Dietary Allowance (RDA) for men and women ages 19+ years is 5 mg daily. For pregnancy and lactation, the amount increases to 6 mg and 7 mg daily, respectively.
