According to the National Center for Complimentary and Alternative Medicine (NCCAM), berberine shows some promise fighting infections, especially eye infections and infectious diarrhea.
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As of now the best place to find up to date information on herbals for health and depression in particular is The National Center for Complementary and Alternative Medicine (NCCAM).
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Beside your personal health care provider NCCAM is where you can go with questions about herbal remedies for depression.
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Groups such as the National Center for Complimentary and Alternative Medicine (NCCAM) attempt to document major studies and share efficacy, benefits and risks with the public.