The market for vitamins can be, well, rather complicated. Vitamins aren’t regulated by the FDA so they don’t have the same strict regulations as, say, drugs — instead, they’re seen as generally safe until proven otherwise.

We suggest choosing options that have been third-party tested to make sure they contain what they say they contain. Shoppers should look for multivitamins that are without additives such as herbs, dyes, and fillers [and] look for the seal from the United States Pharmacopeia (USP). Another certification you can check for is the National Science Foundation’s Good Manufacturing Practices (NSF-GMP).

This is recommended when in search of the best drugstore vitamins. Labels like USP and NSF mean that a company has voluntarily gone through rigorous audit processes to evaluate the quality of the products..