Mk-677, MK677 (or known as Ibutamoren, L-163, L-191) is an orally administrated growth hormone secretagogue. A secretagogue is the term for a substance that chemically signals for the pituitary gland to secrete growth hormone.

In other words, Mk-677 could be compared to peptides like GHRP-6 or Ipamorelin, only it doesn’t require any injections nor does it have any side effects like GHRP-6.

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