Simply not true.
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To use the word/phrase ZMA, you must be licensed by SNAC. There are no licensing requirements to use zinc, magnesium, and vitamin B6 in a supplement.
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You feel the way you do because of the B6. Take a bunch of B6 before you go to bed and you’ll get a similar feeling. B6 is great, as is magnesium and zinc. It ‘works’, but there is no reason why you can’t buy the substances on their own for cheaper and often better quality.