MK-777

MK-777 is the designation provided for this research capsule formulation. A specific biological target or mechanism cannot be reliably assigned without a defined chemical identity. Its research profile should not be assumed to match MK-677 based on the similarity of the names.

Fillers and processing aids: MCC and/or rice or wheat flour, depending on formulation; magnesium stearate and silicon dioxide.

1. MK 777: a research compound related to MK-677

   MK-777 is a small molecule sold as a relative of MK-677, also called ibutamoren. Vendor listings give a formula that matches MK-677 with one added acetyl group. That would make it an acetylated derivative, but we could not confirm the structure against PubMed, a registered trial or a standard chemical database. Unlike peptides and proteins, it is a small molecule rather than a chain of amino acids. Each bottle is listed as 60 capsules of 10 mg MK-777 for laboratory research. The substance is not intended for human consumption or veterinary use.

   What is claimed about muscle growth and muscle mass

   Vendor pages say MK-777 activates the ghrelin receptor, like MK-677, to increase HGH production and stimulate the release of growth hormone and IGF-1. Other claimed benefits cover muscle growth, muscle mass, strength, physical performance, sleep, energy and recovery, as well as hair, skin and nails. Some pages say those hormone changes carry through to the muscles. Others say it causes less water retention than MK-677. None of these claims has been tested in published studies. The only human data in this area belong to MK-677, a different compound.

   What MK-677 studies show, and why they don't transfer

   MK-677 raised growth hormone and IGF-1 in human trials, and a two-year trial in older adults found a small gain in fat-free mass [1]. The same trial found higher appetite, higher fasting glucose and fluid retention, with no gain in strength. Those results describe MK-677, not MK-777. A small change to a molecule can change how it is absorbed, how long it lasts and which receptors it reaches. Any comparison between the two should be considered a hypothesis.

   Laboratory research: what needs to be confirmed first

   For a compound with no published data, a few things come first, starting with what is in the capsule. That means creating a reference standard and having each lot analyzed for identity by mass spectrometry, purity by HPLC and the quantity per unit. A lab can then test receptor binding in cells and compare it with MK-677 at matched concentrations. Without that groundwork, any reported effects on hormones, sleep or body composition can't be tied to the compound.

   Safety and regulatory status

   MK-777 has no published safety data, and its effects in people are unknown. Side effects reported for MK-677, such as fluid retention, joint pain, fatigue and higher blood sugar, are a reasonable starting point for what to monitor in animal studies. MK-777 is not FDA approved and is not approved as a medical drug for any disease anywhere we could find. Anti-doping agencies prohibit growth hormone secretagogues as a class, which would include it. It is not a SARM, and it should be stored out of reach of children.

   Quality testing and storage

   COA-pep products are Made in China. Each batch is tested by an ISO/IEC 17025 accredited US lab for purity (HPLC), identity and quantity, and the full panel appears on the lot's COA. Before you add MK 777 to your cart, check that the lot on your bottle matches a report in the COA Library. See Lab Testing for the methods. If a lot report isn't on the site yet, email our team and we will reply with it. Store the bottle sealed in a cool, dry place away from light.

   Related growth hormone research compounds include Ipamorelin and Sermorelin 10MG, both with published data.

   Questions researchers ask

   How would an acetyl group change MK-677?

   Adding an acetyl group can change how a molecule dissolves, how well it crosses membranes and how fast it is broken down. Some acetylated compounds act as prodrugs that the body converts back to the parent. Whether that happens with MK-777 has not been studied.

   What would a first comparison study with MK-677 look like?

   A lab would test both compounds side by side in a ghrelin receptor assay at matched concentrations. In animals, it would measure growth hormone, IGF-1, food intake and glucose over the same time points. Results from that kind of comparison would be the first real data on MK-777.

   Why do vendor descriptions of MK-777 conflict?

   Different listings describe it as capsules, lyophilized powder or a liquid, and some give different molecular weights. Without a reference structure, vendors copy each other's claims. That is why the batch COA is the most important document for this compound.

   Is MK-777 the same as MK-0777?

   Probably not. MK-0777 was a code used by Merck for an unrelated compound studied for brain disorders. The names are similar, which adds to the confusion in online listings.

   What should researchers record when they use MK-777?

   Researchers should record the lot number, COA results, stock solution details, storage conditions and capsule fill weight. They should also note the vendor's stated identity, so the work can be checked if the structure is later confirmed. Good records make an unverified compound easier to interpret.

   Disclaimer

   For laboratory research use only. Not for human or veterinary use. Not for consumption. This product is not a drug, food or cosmetic. Information on this page is for educational purposes, has not been evaluated by the FDA, and is not intended to diagnose, treat, cure or prevent any disease.

   References

   1. Nass R et al. "Effects of an oral ghrelin mimetic on body composition and clinical outcomes in healthy older adults: a randomized trial." Ann Intern Med. 2008;149(9):601-611. PubMed
   2. World Anti-Doping Agency. "Prohibited List." WADA