Without having watched any of this stuff, my assumption is these videos are not clear enough in disclaiming any confirmed medicinal or FDA-approved effects. If

Without having watched any of this stuff, my assumption is these videos are not clear enough in disclaiming any confirmed medicinal or FDA-approved effects. If the content is tantamount to advertising on the level the supplement manufacturers are prohibited from (and careful to avoid) doing themselves, it's probably appropriate for YouTube to close down the channels. Especially if these YouTubers are somehow generating income from the "product reviews".