What did @teazynlive actually say?
The creator pushed back on people downplaying MK-677 to teenagers, claiming firsthand experience watching a high school friend use it. His account: the friend's bones appeared to visibly grow week by week, he put on noticeable size, looked "aesthetic as hell," but eventually got sick, had abnormal bloodwork, and had to stop. The creator's closing position was contradictory but fair: "I personally wouldn't recommend taking it. Stay natural."
He also challenged the idea that MK-677 is ineffective as a growth hormone secretagogue, which is actually the more defensible part of his argument. The anecdote about his friend, though, is doing heavy lifting here, and anecdotes are not data.
Does the science back this up?
MK-677 (ibutamoren) genuinely does stimulate growth hormone and IGF-1 secretion. That part is not broscience. But the claim that bones visibly changed week-to-week in a teenager is where the story runs ahead of the evidence.
A randomized controlled trial by Murphy et al. (1998, Journal of Clinical Endocrinology and Metabolism) confirmed MK-677 significantly increases GH and IGF-1 levels in adults. A later study by Nass et al. (2008, Journal of Clinical Endocrinology and Metabolism) showed it increased muscle mass and reduced fat mass in older adults over two years. Neither study involved adolescents, and neither documented visible skeletal changes over weeks. Bone remodeling takes months to years, not the timeline described here. The "getting denser" visual observation could reflect water retention, glycogen storage, or muscle fullness, all known side effects of elevated IGF-1, not literal bone growth you can see week to week.
What did they get wrong (or right)?
Credit where it is due: the creator is correct that MK-677 is a legitimate growth hormone secretagogue with measurable effects. People telling teenagers it does "nothing" are wrong, and he is right to push back on that. He is also right that it caused real harm to his friend, specifically abnormal bloodwork, which is consistent with documented side effects.
Where the account breaks down is the "bones and shit are like actually growing" observation. This is almost certainly a misattribution. IGF-1 elevation causes muscle fullness and water retention quickly. Visible bone changes from a secretagogue in weeks are not supported by any published data. More importantly, for an adolescent whose growth plates are still open, elevated GH and IGF-1 do carry real risks, including potential for disproportionate growth, insulin resistance, and hormonal disruption. The hospital visit and abnormal labs described are plausible and align with documented adverse effects in people using MK-677 unsupervised.
What should you actually know?
MK-677 is not approved by the FDA for any indication. It is not a SARM, though it is often grouped with them. It works orally by mimicking ghrelin to stimulate GH release. The effects on GH and IGF-1 are real and documented. So are the side effects: increased appetite, water retention, elevated fasting glucose, insulin resistance, and in some cases fatigue and joint pain.
For adolescents specifically, the risks are not theoretical. Open growth plates respond to GH and IGF-1 signals. Using a compound that significantly elevates these hormones before skeletal maturity is not a studied intervention in humans. There is no safety data for MK-677 in teenagers. None. The creator's friend landing in a hospital with "fucked up" bloodwork is not surprising to anyone familiar with unsupervised hormonal manipulation in a developing body. The creator's final advice, "stay natural," is the only medically sound sentence in the video.
Bottom line verdict
This video is a mixed bag. The creator correctly rejects the claim that MK-677 does nothing, and correctly warns that it caused real harm. But the vivid anecdote about visible bone growth week-to-week is almost certainly a misinterpretation of what was actually water retention and muscle fullness driven by IGF-1. The framing, "do what u will with this information," directed at an audience that includes teenagers, is the real problem here. Presenting a hospitalization story as a cautionary tale while also saying "MK-677 is good, just be safe" sends two messages at once, and for a 70K-view video, that ambiguity matters.