If your purchasing source does not have a Certificate of Analysis on file for each of the products they are selling you, don't buy from them. Manufacturers addresses and phone numbers are often listen on the product packaging, so you can write a letter or telephone the company to ask for a Certificate of Analysis. By making more informed buying decisions you contribute to helping the less informed consumer, by exercising the power of your dollar. Don't buy dietary supplements from sources that are questionable. Ask your health food store or drug store to insist on obtaining Certificates of Analysis for all products they sell.
Information is provided for educational purposes only.
It is not intended as diagnosis or recommendation for treatment of disease. Please consult your physician for medical advice.