What did @benross02 actually say?
The short version: he claims two months on MK-677 improved his sleep, accelerated muscle gain and fat loss simultaneously, cleared his skin, and, most dramatically, made him grow from 6'1" to 6'2" at age 21. He says he had "zero side effects whatsoever" and is now DM-ing followers about where to buy it.
That last part matters. This is not just a personal update. It is a referral pitch for an unregulated compound to an audience of nearly 200,000 people, many of whom are probably teenagers chasing the same inch of height. The framing is personal testimony, but the function is a sales funnel.
Does the science back this up?
MK-677 (ibutamoren) does have real pharmacological activity. It is a ghrelin receptor agonist that stimulates growth hormone and IGF-1 secretion. Some of the sleep and recovery claims have partial support in the literature. The height and body composition claims, though, are a different story.
On sleep: Chapman et al. (1996, Journal of Clinical Endocrinology and Metabolism) found that MK-677 significantly increased REM sleep in healthy older adults. That finding is real, though it was in an older population, not 21-year-olds.
On body composition: Nuttall et al. (1999, Journal of Clinical Endocrinology and Metabolism) showed modest lean mass increases in older adults, but simultaneous muscle gain and fat loss in young, healthy men is not what the clinical data demonstrates. Elevated GH can increase lipolysis, but the effect size in short-term trials is modest and diet-dependent.
On growing an inch at 21: this is where the science falls apart completely. Longitudinal bone growth requires open epiphyseal growth plates. Most males have fully fused plates by 18-21. MK-677 does not reopen fused growth plates. There is no mechanism and no evidence for this.
What did they get wrong (or right)?
The sleep claim is probably the most defensible thing he said. GH pulses during slow-wave sleep are real, and MK-677 does appear to enhance them. Credit where it is due.
The "zero side effects" claim is flatly wrong as a generalizable statement. MK-677 is associated with increased appetite, water retention, elevated fasting glucose, and transient insulin resistance. Svensson et al. (1998, Journal of Clinical Endocrinology and Metabolism) documented these in controlled settings. He may not have noticed them, or may have attributed them to other causes, but telling 195,000 people it carries zero risk is irresponsible.
The height claim is the most damaging. Saying "I went from six foot one to six foot two" and attributing it to MK-677 is almost certainly a measurement artifact or normal diurnal height variation, which can be up to 1.5 cm depending on time of day, posture, and footwear. Presenting this as MK-677-driven growth to a young audience is misleading in a way that could push teenagers toward unsupervised use of a compound that has not been approved by the FDA for any indication.
What should you actually know?
MK-677 is not FDA-approved. It is not a supplement. It exists in a legal gray area, typically sold as a "research chemical." Purity and dosing in gray-market products are unverified. The FDA has issued warning letters to companies selling it, and the compound is banned by WADA in competitive sports.
The body composition effects, where real, are modest without optimized training and nutrition, which is exactly what he said. That part is accurate. But he is essentially saying the compound is doing the heavy lifting when the data suggests his diet and training are.
- MK-677 stimulates GH and IGF-1 but is not equivalent to prescribed growth hormone therapy.
- Unregulated sources carry real contamination risk. You do not know what you are getting.
- Any young person still in or near puberty using GH secretagogues without medical supervision faces risks that a two-month TikTok anecdote cannot capture.
- If you are interested in GH-related optimization, that conversation belongs with a licensed clinician who can order baseline IGF-1 labs, not a DM from a content creator.
Bottom line
This video mixes one plausible claim (better sleep and recovery) with one physically impossible claim (height gain at 21 from MK-677) and closes with a referral to an unregulated source. The scientific literature does support some of MK-677's effects, but not in the dramatic, side-effect-free way described here. Treat it as enthusiastic anecdote, not evidence.