GHK-Cu for anti-aging: what the peptide hype gets wrong

What did @its.that.girl.tash actually say?

The creator describes her current injection protocol as four compounds: "GHK-Cu two milligrams a day," glutathione at 200mg three times per week, NAD three times per week, and "microdose" semaglutide at 1.5mg per week. She also walks back an earlier negative reaction to NAD, attributing it to a nerve medication she was on, not the compound itself.

This is a relatively detailed stack disclosure by TikTok standards. She does not claim to treat or cure anything specific. She frames everything around personal experience and how she is "feeling really good." That framing matters when evaluating what she actually claimed versus what viewers might infer.

Does the science back this up?

The compounds she mentions have real research behind them, but the depth of that evidence varies considerably from one to the next. Lumping them together as a "stack" obscures those differences.

GHK-Cu (copper peptide) has the most interesting preclinical data. Pickart and Margolina (2018, Biomolecules) documented its role in activating antioxidant defenses, wound healing gene expression, and collagen production in cell and animal models. The gap between those findings and injecting 2mg daily in humans is large. Human RCT data is essentially absent for systemic injection use.

Glutathione IV/injection is widely used in aesthetic medicine, but the clinical evidence for systemic anti-aging effects is thin. Teskey et al. (2018, Journal of Alternative and Complementary Medicine) noted some antioxidant benefit in small trials, with bioavailability remaining the persistent problem.

NAD precursors and injectable NAD have growing human trial data. Martens et al. (2023, Nature Aging) showed NMN supplementation raised blood NAD levels and improved some markers in older adults. Injectable NAD skips the conversion step, but large RCT evidence is still limited.

Semaglutide microdosing at 1.5mg weekly is within the lower end of the approved dosing range for weight management. The creator is not misrepresenting a fringe protocol here, though "microdose" typically implies sub-therapeutic dosing, which 1.5mg is not by most clinical standards.

What did they get wrong (or right)?

Credit where it is due: she does not claim these compounds cure diseases, she discloses specific doses, and she correctly walked back her earlier NAD complaint rather than letting misinformation stand. That kind of correction is rare on this platform.

The problems are in what is implied and what is missing. Calling this a "stack" with a biohacking frame implies the combination is optimized or validated. It is not. There are no human studies examining this specific combination. Drug-drug interaction data for GHK-Cu plus glutathione plus NAD plus semaglutide does not exist in any published literature.

Her description of 1.5mg semaglutide as a "microdose" is also inaccurate by clinical definition. The approved maintenance dose for Ozempic starts at 0.5mg and goes to 2mg. At 1.5mg, she is within the standard therapeutic range, not below it. Calling it a microdose may mislead viewers into thinking it is a safer, sub-threshold amount.

The NAD attribution reversal is interesting but incomplete. She says a nerve medication was causing her bad reaction, not the NAD. That is plausible, but she does not name the medication or explain the interaction. Viewers cannot evaluate that claim without more information.

What should you actually know?

If you are considering any of these compounds, the most important thing to understand is that "feeling really good" is not a clinical outcome. It is real and valid as personal experience, but it cannot separate the effects of individual compounds from placebo, lifestyle changes, or the simple effect of medical attention.

GHK-Cu injections are not FDA-approved for any indication. Compounded versions exist in a regulatory gray zone. Glutathione injections have been flagged by the FDA in the past for quality control issues in compounded form. Injectable NAD is available through compounding pharmacies but lacks the standardized dosing that comes with approved drugs.

Semaglutide at any dose requires medical supervision because of real risks: pancreatitis, thyroid C-cell concerns in rodent models, gastrointestinal complications, and contraindications in certain populations. The "microdose" framing should not suggest this is a casual addition to a wellness routine.

Anyone watching this video and thinking about replicating the stack should speak with a licensed clinician who can review their full medication list, not a TikTok comment section.