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TB500 acetate. PubChem Compound Summary

Store your lyophilized powder in a cool, dry place or refrigerate for extended shelf life

It is not scheduled under the Controlled Substances Act, but products marketed as "MK-677" capsules or powders are unapproved drugs under FDA rules, and in practice it is sold almost exclusively online as an unregulated "research chemical" labeled not for human consumption

You might experience some common mild side effects, like a bit of irritation at the injection site or perhaps a mild headache, but don't worry, these are quite rare