By the Neurogan Health team · 3 min read · Reviewed for accuracy
Most hair care treats the strand. The change that matters happens at the root.
The quick version
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Shampoo cleans the strand. It doesn't reach the follicle, where thinning actually starts.
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Copper peptides (GHK-Cu) are studied for supporting the scalp environment at that level.
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Concentration and formula matter more than most labels let on. Ours is 2,400 mg, two ingredients.
Expensive shampoo. The right conditioner. A good brush. Most hair routines are built entirely around the strand you can see. But hair doesn't thin at the tip. It thins at the root, in an environment washing alone can't reach.
It starts beneath the surface
Every strand grows out of a follicle running through several layers of scalp tissue. That follicle needs a stable environment to keep producing strong hair: steady blood flow, a balanced scalp, no ongoing inflammation at the base.
When that environment declines, hair often keeps growing for a while, just finer, and sheds a little faster than it's replaced. By the time it's visibly thinner in the mirror, that process has usually been underway for months.
Growth starts at the follicle, several layers below the surface.
Shampoo and conditioner mostly work on the hair shaft, the part above the scalp. They can make hair look healthier on the surface without doing anything for the root, which is why "the good stuff" and gradual thinning often happen at the same time.
2
ingredients, formulated for the scalp, not the strand
8-12
weeks is a realistic window to judge results
100k+
customers since 2016
Why scalp-level care is a different job
Topical scalp treatments are built to reach the follicle environment directly, instead of coating the strand from outside. That's a different job than shampoo does, and it's why scalp-focused research looks at what's applied directly to the skin, not just what's rinsed through the hair.
The distinction that matters: a strand-care product and a scalp-care product solve two different problems. Most routines only cover the first one.
What the research actually shows
One ingredient that comes up often in this research is copper peptide, specifically GHK-Cu. Copper peptides have been shown to stimulate collagen production in dermal fibroblasts, the support cells found throughout the scalp and skin, including around the hair follicle.
A closely related copper peptide has also been studied directly on human hair follicles, where it affected the specialized cells that regulate hair growth cycles. Researchers see this as part of a broader picture: copper peptides support the underlying tissue environment that healthy follicles depend on.
GHK-Cu is used here as a cosmetic ingredient, studied for supporting the appearance of hair density and scalp comfort. It is not a drug and isn't intended to treat a medical hair-loss condition.
The practical catch is concentration. Most commercial GHK-Cu serums use it as one ingredient among ten or more, often at a fraction of the levels used in the research it's cited from.
FIGURE · GHK-CU PER BOTTLE
Six times the dose most serums print
mg
0
800
1,600
2,400
2,400 mgNeurogan GHK-Cu
~400 mgMost GHK-Cu serums
6×
GHK-Cu content per bottle. "Most serums" reflects typical labeled amounts across competing copper-peptide products.
What to actually expect
Because this works at the follicle level rather than coating the strand, it isn't a same-week difference. Most people assess results over 8 to 12 weeks of consistent, daily use:
Wk 0-4
Scalp absorbs and conditions. No visible change yet, this phase builds the foundation.
Wk 5-8
Scalp typically feels more hydrated. Some notice areas looking fuller.
Wk 9-12
Most users are ready to properly judge whether it's working.
Real People. Real Results.
Is This For You
Is this the right fit?
RECOMMENDED
Good fit if you want
You're noticing early thinning and want to stay ahead of it
You want a simple daily scalp routine, not a complicated one
You prefer a clean, two-ingredient formula with no fragrance or fillers
Probably not for you
You expect visible change within a week. Plan on 8 to 12 weeks.
You want a medical treatment. This is a cosmetic product, not a drug.
You're not able to commit to a daily routine
4.4(104 reviews)
GHK-Cu Copper Peptide
Suero para cabello y cuero cabelludo con péptido de cobre GHK-Cu
2,400 mg of GHK-Cu in a simple, two-ingredient, water-based formula. Third-party lab tested, no fragrance, no fillers.
✓ Third-party tested✓ 30-day guarantee✓ Free US shipping
Trusted by Thousands
What real customers are saying
104 reviews and counting for the GHK-Cu Hair & Scalp Serum.
4.4 / 5
Average rating
104
Verified reviews
100k+
Customers since 2016
Been using for about a month and I'm definitely seeing less shedding. Non-greasy, absorbs well.
Elaine B. · ✓ Verified Buyer
Love that this only has two ingredients and leaves no residue. Easy to use in the morning.
Rachael K. · ✓ Verified Buyer
Non-greasy formula, and I noticed my scalp felt calmer within the first couple weeks.
Marcus T. · ✓ Verified Buyer
Appreciate that the concentration is actually printed on the bottle. Takes a few weeks to notice anything, but it's been worth the patience.
David P. · ✓ Verified Buyer
Simple routine, no fragrance, no mess. My scalp feels less irritated than it did with other treatments I've tried.
Priya S. · ✓ Verified Buyer
Ordered after reading about the research behind copper peptides. Three months in and my part line looks fuller.
Jonathan M. · ✓ Verified Buyer
Subscribe and save made it easy to stick with daily use. That consistency is probably why it's working for me.
Casey W. · ✓ Verified Buyer
Third-party lab tested
Every batch, results published
Family-owned since 2016
No outside pressure on formulation
30-day guarantee
Full refund, no questions asked
30-Day Guarantee
Start where the thinning actually starts.
Two ingredients. 2,400 mg of GHK-Cu. One daily step for your scalp.
✓ Free shipping over $70✓ Cancel subscription anytime✓ Made in the USA
Disclaimer
This article discusses cosmetic scalp care and reflects general research on copper peptides in dermal fibroblasts and, for a closely related copper peptide, in human hair follicle cells. It is not medical advice. GHK-Cu is used here as a cosmetic ingredient to support the appearance of hair density, strength, and scalp comfort. It is not a drug and is not intended to treat a medical hair-loss condition. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Not for use by persons under 18. Do not use if pregnant or nursing. Consult a physician before using this or any dietary supplement. Individual results vary.
