With many vitamins and minerals, you won't know for years whether or not they are working. With Niacin, I know in minutes. I get much less effect from 1000mg of this B3 than from a 100 mg of a competitor's product. Based upon the effects of this product, I have serious questions as to the purity of the Piping Rock products and will probably return everything I ordered.
Bottom Line: No, I would not recommend this to a friend
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