MK-677 dosing claims on TikTok: what the science says

What did @biaxolsupplements actually say?

The creator argued that 25mg is "too aggressive out of the gate" for first-time MK-677 users, and that starting at 10-15mg gives the body a chance to adapt before bumping up. They also claimed MK-677 "works gradually by optimizing growth hormone levels all the time," suggesting patience and precision matter more than high doses. The video is short on mechanism and long on bro-science phrasing, but the core dosing philosophy is at least worth examining against actual data.

To be clear upfront: MK-677 (ibutamoren) is not approved by the FDA for any therapeutic use. It is classified as an investigational compound. Nothing in this fact-check constitutes a dosing recommendation. We are evaluating what the creator said against published research, not endorsing the use of this compound.

Does the science back this up?

Partly, yes. The general direction of "start lower, titrate up" is pharmacologically sound for MK-677, even if the creator does not explain why. The side effect profile they describe is real and documented in peer-reviewed literature.

A study by Copinschi et al. (1997, Journal of Clinical Endocrinology and Metabolism) used 25mg daily in older adults and documented increased GH pulse amplitude and IGF-1 levels, but also noted fluid retention and increased appetite as common adverse effects at that dose. A separate trial by Nass et al. (2008, Journal of Clinical Endocrinology and Metabolism) tested 25mg over two years in elderly patients and flagged edema and increased fasting glucose as recurring issues. The creator's list of water retention, elevated hunger, and brain fog maps onto these findings reasonably well, though brain fog is not consistently reported in controlled trials and may reflect individual variation or sleep architecture disruption. MK-677 is known to increase slow-wave sleep in some studies (Copinschi et al., 1997), which can paradoxically cause vivid dreams and next-day grogginess in some users.

What did they get wrong (or right)?

They got the side effect list broadly right. Water retention and appetite increase are the most consistently reported adverse effects in clinical literature, and leading with those as reasons to start lower rather than higher is reasonable harm-reduction framing.

What they got wrong, or at least oversimplified, is the phrase "optimizing growth hormone levels all the time." MK-677 works by mimicking ghrelin and stimulating pulsatile GH release from the pituitary. It does not produce a flat, continuous elevation of GH. It amplifies existing GH pulses. That distinction matters because chronic non-pulsatile GH elevation carries different risks than amplified pulsatile secretion. The creator flattens this into a simple "gradual optimization" narrative that does not reflect how the compound actually works.

They also say "you don't need more, you need more precision" without explaining what precision means in practice. That is vague enough to be meaningless as guidance and risks sounding like a benefit claim without supporting evidence.

What should you actually know?

MK-677 is not a supplement. It is an investigational secretagogue. Calling it a supplement, as the video hashtags suggest, is misleading under FDA definitions. It has not completed Phase III trials for any indication. Long-term safety data in healthy adults is essentially nonexistent beyond a handful of small studies in elderly or GH-deficient populations.

The side effects the creator mentions are real, but the list is incomplete. Nass et al. (2008) also documented increased fasting blood glucose and insulin resistance over two years of use, which the creator does not mention at all. For anyone with metabolic risk factors, that omission is not trivial.

• MK-677 is not FDA-approved and is not legally a dietary supplement in the United States.
• Published trials used doses of 25mg, primarily in elderly or GH-deficient populations, not healthy young adults.
• Water retention and appetite increase are the most commonly documented short-term side effects.
• Insulin resistance and elevated fasting glucose have been reported with extended use.
• Brain fog is not consistently documented in trials but may relate to sleep architecture changes.

Bottom line verdict

The creator is not entirely wrong, but they are working from a narrow slice of the evidence and presenting an unapproved investigational compound as though it is a tunable performance tool. The dosing caution is reasonable. The mechanism description is oversimplified. The missing metabolic safety information is a genuine gap that matters for anyone considering use. If you are exploring peptide therapy, this is a conversation for a clinician with access to your labs, not a 60-second TikTok.