What did @juzykunt actually say?
The creator claims that MK-677 "just hit" them, that they think they've "already grown taller," and that they're experiencing what they call "MK Rage." These are three distinct claims packed into about 30 seconds of gym footage. Let's be honest about what this video is: someone performing for the camera, not reporting a clinical outcome. But since 62,500 people watched it, the misinformation potential is real and worth addressing directly.
Does the science back this up?
No, not in any meaningful way. MK-677 (ibutamoren) is a ghrelin receptor agonist that stimulates growth hormone secretion and raises IGF-1 levels. It does not cause an immediate psychoactive "hit" like a stimulant would. Growth hormone secretion from a single dose takes hours to peak, not seconds. The idea that you feel it within moments of taking it is almost certainly a placebo response or performance. As for growing taller: adults with fused growth plates cannot gain height from growth hormone stimulation, full stop. Nørrelund et al. (1999, Journal of Clinical Endocrinology and Metabolism) confirmed MK-677 increases GH and IGF-1 over weeks of dosing, not within minutes of a single dose. There is no peer-reviewed literature supporting acute perceptual effects from MK-677 that would resemble what the creator describes.
What did they get wrong (or right)?
They got almost everything wrong here, though "wrong" might be too generous a word when the video is clearly comedic in tone. Here is the breakdown:
- "I think I already grown taller": Physiologically impossible for an adult. Growth plates fuse by the late teens to early twenties. No secretagogue changes that. Cutler et al. (2021, Growth Hormone and IGF Research) confirm that GH axis stimulation in adults does not produce longitudinal bone growth.
- "The MK just hit me": MK-677 is an orally active compound with a half-life of roughly 24 hours. It does not produce a rapid-onset subjective effect comparable to stimulants or psychoactive substances. If they felt something immediately, that was expectation bias.
- "MK Rage": There is no established pharmacological mechanism for MK-677 to cause acute aggression or a "rage" state. Some users report increased appetite and water retention as side effects. Rage is not in the literature.
To give the creator minimal credit: MK-677 does interact with the GH axis, so at least the compound category is relevant to gym recovery discussions. That is where the accuracy ends.
What should you actually know?
MK-677 is not FDA-approved for human use outside of specific clinical trials. It is not a growth hormone; it is a secretagogue that prompts your pituitary to release more of its own GH. That distinction matters. Long-term data on chronic use in healthy adults is limited. Known side effects from clinical literature include increased appetite, water retention, and elevated fasting glucose. Murphy et al. (1998, Journal of Clinical Endocrinology and Metabolism) found these effects in elderly subjects over two years of use. The compound is also on the World Anti-Doping Agency prohibited list. Anyone sourcing this outside a licensed, regulated telehealth provider is getting an unverified product with no quality controls, and no physician oversight. The entertainment framing of this video makes that risk invisible to its audience.