Peptide therapy TikTok claims: what the science actually supports

What did @carlos.cesar.de.c actually say?

The creator walked through a step-by-step reconstitution protocol for GHK-Cu, recommending "three MLs of back water" as the diluent. They specified dosing at "two milligrams daily for eight to 12 weeks" followed by a four-week cycle break. They also gave unit calculations: six units on an insulin syringe for a 100mg vial and 12 units for a 50mg vial, and pointed viewers to a vendor called Pepteria with a discount code. The video frames all of this as "research purposes only, not medical advice," which is a disclaimer that does not change the practical effect of telling tens of thousands of viewers exactly how to inject a peptide at a specific dose.

The reconstitution mechanics shown are largely standard practice for lyophilized peptides. The dose and cycle claims are where things get complicated fast.

Does the science back this up?

GHK-Cu has genuine research behind it, but almost none of that research involves humans injecting it subcutaneously at 2mg per day. The evidence base is narrower and more conditional than this video implies.

GHK-Cu (copper peptide GHK-Cu) has been studied for wound healing, collagen synthesis, and antioxidant activity, primarily in cell culture and animal models. Pickart and Margolina (2018, Biomedicines) summarized decades of in vitro and animal data showing GHK-Cu promotes fibroblast activity and skin remodeling. Wound-healing and topical applications have the most data. A 2015 study by Gorouhi and Maibach in the International Journal of Cosmetic Science supports topical GHK-Cu for skin rejuvenation endpoints, but that is a very different delivery route than subcutaneous injection.

For systemic subcutaneous use at the doses this creator recommends, there are no published human clinical trials. The "two milligrams daily" figure circulates widely in peptide communities but is not derived from dose-finding studies in humans. Saying the science backs up that specific regimen would be an overstatement.

What did they get wrong (or right)?

The reconstitution technique itself is mostly correct. Using bacteriostatic water, swabbing vial tops with alcohol, injecting air to create a pressure differential, and gently rolling rather than shaking a reconstituted peptide are all standard practices. Credit where it is due.

The math, however, has a significant error. For a 100mg vial reconstituted with 3mL of bacteriostatic water, the concentration would be approximately 33.3mg per mL. At a dose of 2mg, you would need roughly 6 units on a 100-unit insulin syringe. That checks out. For a 50mg vial with the same 3mL of water, the concentration would be approximately 16.7mg per mL, meaning 2mg would require approximately 12 units. That also checks out mathematically.

What does not check out is the framing. The creator says "research purposes only, not medical advice" and then immediately describes a specific daily dose, cycle length, and unit measurement. That is a legal disclaimer used to sidestep responsibility, not a genuine clinical caveat. Presenting dosing instructions to a general TikTok audience without any mention of individual variation, contraindications, copper metabolism considerations, or the fact that injectable GHK-Cu is not FDA-approved for any indication is a meaningful omission.

The vendor promotion embedded in a dosing tutorial also deserves scrutiny. Recommending a specific supplier alongside dosing instructions blurs the line between educational content and commercial promotion.

What should you actually know?

GHK-Cu is a naturally occurring tripeptide that declines with age. The basic biology is interesting and the topical data is more solid than most peptide enthusiasts acknowledge, but the injectable use case is substantially ahead of the published evidence.

There are real questions about systemic copper loading that this video does not address at all. Copper homeostasis is tightly regulated, and the implications of repeatedly injecting copper-bound peptides subcutaneously have not been studied in long-term human trials. Pickart (2008, Journal of Inorganic Biochemistry) notes that GHK has a high affinity for copper and may help transport it, but that is not the same as confirming that daily injections are safe over weeks-long cycles.

If you are genuinely interested in GHK-Cu, the most evidence-supported route remains topical. If you are considering injectable use, that conversation belongs with a licensed clinician who can review your copper levels and overall health context, not a TikTok comment section or a paid online community.

• GHK-Cu has legitimate research behind it, primarily for wound healing and skin applications via topical delivery.
• Subcutaneous injection protocols at specific doses like "two milligrams daily" lack human clinical trial support.
• The reconstitution math and technique shown are largely accurate.
• The "research purposes only" disclaimer does not reduce the practical risk of presenting dosing instructions to a general audience.
• Copper metabolism considerations are absent from this video and should be part of any serious discussion of systemic GHK-Cu use.