how to read a supplement COA (and why it matters)

certificate of analysis basics: look for third party lab (NSF, USP, Informed Choice, ConsumerLab), batch matching the one you bought, heavy metals + microbial limits within spec, and identity confirmation. if the company can't/won't send a COA for your batch, it is a flag. most of the supplement industry is unregulated pre-market. this is how you protect yourself.