GHK-Cu in skincare: what derms on TikTok get right and wrong

What did @thebeautyderm actually say?

Honestly? Not much, at least not in the transcript. The only words captured are song lyrics: "So now you know the game / Are you ready? / Cause I'm coming to get ya." The actual skincare content, if there was any, appears to have been delivered visually or wasn't captured in the transcript provided. What we do have is the caption, which outlines a nighttime routine: double cleanse, hydrate, moisturize, treat, and protect. Products tagged include Prequel Skin, La Roche-Posay, and Aquaphor. The hashtags reference retinol and anti-aging. So we're working from context more than direct quotes here, which is worth naming upfront.

The caption also tags this as a dermatologist-led routine, and the creator handle references "derm." That credentialing matters, because it shapes how viewers receive the advice. When a dermatologist recommends a routine, viewers reasonably assume it reflects clinical knowledge, not just personal preference.

Does the science back this up?

The general framework, double cleansing, hydrating, moisturizing, and using a treatment like retinol, is well-supported. It is not revolutionary, but it is grounded in evidence. The steps roughly mirror what the American Academy of Dermatology recommends for basic skin maintenance.

Retinol specifically has a strong track record. A 2016 review by Mukherjee et al. in Clinical Interventions in Aging confirmed that topical retinoids reduce fine lines, improve skin texture, and stimulate collagen synthesis. La Roche-Posay products, particularly those containing niacinamide or thermal spring water, have shown barrier-support benefits in multiple industry-funded but peer-reviewed trials. Aquaphor as an occlusive final step, sometimes called "slugging," has support from barrier repair research. A 2021 paper by Sethi et al. in Dermatology and Therapy confirmed petrolatum-based occlusives reduce transepidermal water loss significantly.

So the bones of this routine are solid. The issue is that without hearing specific claims, it is hard to fact-check specifics.

What did they get wrong (or right)?

Given the caption framing, the routine gets more right than wrong. Double cleansing at night is appropriate, particularly for people wearing SPF or makeup. Hydrating before moisturizing, likely referring to a humectant like hyaluronic acid before an emollient, reflects the correct order-of-application logic backed by occlusion hierarchy research.

The "treat" step presumably refers to retinol, which belongs at night, not morning, given its photodegradation and potential for UV sensitivity. That is correct practice. Using Aquaphor as a final seal is also legitimate.

One thing worth flagging: the caption says "protect" as a nighttime step. If that refers to SPF, that is a misplacement. SPF is a morning product. It offers no benefit overnight and is not indicated for nocturnal use. If "protect" means an occlusive like Aquaphor, then fine, but the language is ambiguous enough to mislead viewers who might reach for their sunscreen at bedtime.

The filter disclaimer at the end is a minor point but a fair one to include. Skin appearance in these videos is not representative of product results.

What should you actually know?

A consistent nighttime routine with a retinoid, a barrier-supporting moisturizer, and an occlusive is one of the most evidence-backed approaches to skin aging that exists. You do not need expensive products. The steps matter more than the brands.

Retinol requires patience. Most studies showing structural skin improvements use 12 to 24 weeks of consistent use as the minimum measurement window. Mukherjee et al. 2016 and a 2007 study by Kang et al. in the Archives of Dermatology both showed collagen-level changes only after months of use, not days.

If you are new to retinol, start at 0.025 to 0.05 percent and increase slowly. Irritation, dryness, and peeling are common early on, particularly if you skip the moisturizer step or apply retinol to damp skin. Sandwich method, moisturizer, retinol, moisturizer, reduces irritation for sensitive skin types, per Draelos et al. 2018 in the Journal of Drugs in Dermatology.

Finally, this video is categorized under peptide therapy on this platform, which deserves a direct note. Topical GHK-Cu is the one peptide with legitimate surface-level evidence for skin remodeling. A 2018 review by Pickart and Margolina in Biomolecules outlined its role in collagen synthesis and wound healing at the cellular level. Injectable peptides like BPC-157 or CJC-1295 are not skincare products and are not what this video is recommending. Do not conflate topical cosmetic routines with systemic peptide protocols. They operate through entirely different mechanisms.