See below:: For USP info see http://www.Usp.Org/usp-verification-services/usp-verified-dietary-supplements/verified-supplements i have no idea what usdv is- google doesn't seem to know either. While USP is a sign of quality, many excellent supplements do not have this- it costs a company money to get certified. Gmp audit (part of the USP standard) is also a sign of quality...
Answered 6/26/2018
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