What did @brettbefit actually say?
Brett reported that NBA player Tristan Thompson was suspended for testing positive for ibutamoren and the SARM LGD-4033, then pivoted to explain ibutamoren is the same compound as MK-677. He listed several claimed benefits: recovery, sleep, preventing muscle wasting, endurance, appearance, and appetite stimulation. He closed with a joke about Dwight Howard's reported candy habit.
The Tristan Thompson suspension is factually accurate. The NBA announced the suspension in 2023, and the league's official statement confirmed both ibutamoren and LGD-4033 as the detected substances. Brett is also correct that ibutamoren and MK-677 are the same compound. That part of the video is straight reporting, and he gets credit for it.
Does the science back this up?
MK-677's effects on growth hormone secretion are real and documented. The recovery and sleep claims have some legitimate backing, but the endurance claim is the weakest link in this chain, and Brett presents the whole list as settled fact when it is not.
MK-677 is a ghrelin receptor agonist and a growth hormone secretagogue. It raises IGF-1 and GH levels without requiring injection. Svensson et al. (1998, Journal of Clinical Endocrinology and Metabolism) confirmed its GH-stimulating effects in healthy adults. On sleep, Copinschi et al. (1997, Sleep) found oral MK-677 increased REM sleep and slow-wave sleep in older adults, which supports the sleep claim. The muscle-wasting data comes mostly from elderly or catabolic populations. Nass et al. (2008, Annals of Internal Medicine) showed it preserved lean mass in hip fracture patients. Generalizing that directly to elite athletes is a stretch the data does not fully support.
On endurance, the evidence is essentially nonexistent in healthy athletic populations. GH elevation does not reliably translate to aerobic performance improvements. Brett saying it "helps out with endurance" is not supported by any published trial in athletes.
What did they get wrong (or right)?
Brett gets the basics right but packages speculation as consensus. Calling it "MK-677" throughout is accurate. Calling the suspension factual news is fine. But presenting endurance enhancement as a known benefit crosses from reporting into marketing territory, especially on a video that ends with affiliate codes for a peptide brand.
The appetite stimulation claim is actually the best-supported one in this video. Ghrelin receptor agonism drives hunger reliably. That mechanism is well-documented and the Dwight Howard candy joke, while silly, accidentally lands on a real pharmacological point. MK-677 elevates ghrelin signaling, and chronically elevated ghrelin is strongly associated with increased caloric intake. That part is accurate.
What Brett skips entirely: MK-677 causes water retention, can worsen insulin resistance, and has not been approved by the FDA for any indication. Presenting it as something athletes just casually use "because it works" without any of that context is incomplete at best. The compound is also explicitly banned by WADA and NBA anti-doping rules, which is literally what the video is about.
What should you actually know?
MK-677 is not a peptide in the strict biochemical sense. It is a small-molecule ghrelin mimetic. That distinction matters because the regulatory and safety profile differs from injectable peptides. The FDA has not approved it for human use. Any product sold commercially is either a research chemical or a compounded preparation, and quality control varies widely between suppliers.
The clinical studies on MK-677 are real, but most involve elderly subjects, GH-deficient patients, or short-duration trials. Translating those findings to a healthy 25-year-old athlete is an extrapolation, not a conclusion. The side effect profile includes elevated fasting glucose, increased appetite leading to fat gain in some users, and edema. Friedman et al. (2013, Journal of Clinical Endocrinology and Metabolism) flagged insulin sensitivity concerns with prolonged use. Anyone considering MK-677 for any reason should have those conversations with a licensed clinician who can actually review their bloodwork, not an Instagram coach promoting an affiliate code.
The affiliate code problem
This video was reported as news but ends with a discount code for a peptide vendor. That context matters when evaluating how the information is framed. Brett lists benefits with confidence and omits risks entirely. That is a pattern worth noticing, regardless of whether the underlying facts are accurate.