the first couple weeks i had the best skin i ever had and im at week 6-7 and holy fuck i never used to have acne i’m breaking out everywhere and i look like i’ve aged 15 years in a couple weeks.
NegativeInjection · 6-7 weeks
Strict case
Borderline: theoretical growth-factor/angiogenic signalling at supraphysiological systemic doses with no human injectable safety data. Topical GHK-Cu gives much of the skin benefit without this.
Users report
Many glowing before/after posts: firmer skin, fewer spots, brighter under-eyes, faster hair and nail growth, milia clearing. Results build over 6-20 weeks, often after a temporary 'copper ugly' phase. Roughly 25% see nothing, especially under 35. Injections sting and leave welts unless diluted, and some get hard lumps or lasting marks. A minority say their skin got duller, saggier or broke out for good rather than passing through the 'uglies', and a recurring cluster report systemic reactions in the first days or weeks: flu-like aches, lightheadedness, vomiting, or itchy marks all over the body. Serum copper usually stays normal.
Best effects
Skin firmness and tone · less under-eye hollowness/darkness · faster hair and nail growth · improved wound/scar healing
Borderline/theoretical: stimulates growth factors (VEGF, bFGF) and angiogenesis in wound models, at systemic levels far above physiological · FDA flagged immunogenicity/aggregation for injectable GHK-Cu; limited human injectable data · Chronic copper load (small; serum copper usually normal)
Evidence
Small human studies — Topical only; no human trials of injection
Typical use
1-2 mg/day subQ (some up to 4 mg), diluted with extra bacteriostatic water, often 5 days on / 2 off for 12 weeks. Users report 1.5–3.2 mg/day (median 2 mg, n=11).
Getting it
Research-peptide vendors (50-100 mg vials, alone or in GLOW/KLOW blends); some US med-spas and telehealth clinics prescribe compounded vials. FDA lists injectable GHK-Cu among substances with safety concerns.
Stacked with
BPC-157 and TB-500 (GLOW) or plus KPV (KLOW): The usual way it is sold and pinned; users say BPC-157 or KPV in the same syringe reduces the sting and welts. · Topical GHK-Cu or AHK-Cu serum: Many pin and apply topically at once, or switch to topical between injectable cycles. · Tretinoin and red light: Common skin-care pairing in r/30PlusSkinCare; makes it hard to tell which did what. · Zinc: Taken to balance the extra copper and, some claim, to reduce injection-site reactions.
I’ve (60F) been on GHK-Cu daily since January. Started at 2mg/day, now at 4mg/day. The stuff is amazing. I haven’t had my hair stop going gray, but it does grow faster, same with my nails.
I've done one month of injectable copper and I am GLOWING. Also my hands look younger. I'm 43 and spend a fortune on my skin but this took it to another level.
Started GHK-CU injections 6 weeks ago. Doing 1.5mg a day. Now I noticeably have chest hair. My skin has never looked better and even the fine lines on my face have disappeared.
I noticed an insane difference when upping my dose from 1mg a day to 3.5mg a day. I ran 1mg a day SuvQ for 3 months and then decided to just up it. All I can say is... Wow. I look noticeably younger.
Glowing1 mg/day for 3 months, then 3.5 mg/day · Injection
About 2 months in I started noticing some differences, and at around 3 months my sister told me my skin looked “almost dewy,” and that my pores looked smaller. (I’m 55.)
Im on week 7 now and finally starting to get out of the copper ugly phase and getting positive results. The biggest difference for me is my under eyes, ive always had bad under eyes, dark and hollow.
So it doesn’t get rid of them but they just look better like they don’t fold into the surrounding skin the same way. The skin around the lines is more supple so the lines don’t dig as deep.
I've been using it for about 6 months and I can only tell a difference if I look at pictures of myself from before starting. Day to day my changes have been subtle enough to not really notice. Most notable for me though is hair.
I went 5mg for 2 months, got a side effect where I didn't need to sleep more than 3 hours a day to feel rested, it was not that bad but didn't feel like it was good
I’ve been taking it for about 5 months and I don’t notice any positive improvements. Also it’s the only peptide that leaves bruises for me that last several days.
the first couple weeks i had the best skin i ever had and im at week 6-7 and holy fuck i never used to have acne i’m breaking out everywhere and i look like i’ve aged 15 years in a couple weeks.
I’ve tried subcutaneous I abdomen, my glute, my delts and it was the same reaction, with the intramuscular injections being a little better but still red, bruised and now hard. After the redness disappears I have hardened scar tissue at each area Ive injected in.
I started a couple weeks ago injecting a small amount - I look like I aged 5 years! Jowls are significantly worse. I hope it reverts back after stopping. Super disappointed
Insane lightheadedness, weird nerves firing around my body and head, feeling extremely strange (health wise) like I was barely clinging to consciousness. It was bizarre. Had to stop because of it.
the fool that got it for me got the mg and the ml mixed up and I was taking 40iu when I should of been taking 6iu after a few weeks i experienced copper toxicity and a week of sickness and diarrhoea followed.
Bad reactionInjection
dosing error, about 6-7x the intended dose for weeks
I took 10 units, 50mg vial reconstituted with 3ML BAC for 4 days was fine for 3, day 4 started vomiting and swearing profusely. Couldn’t eat for weeks.
I did about 2 weeks 1-1.5mg 50mg/3ml BAC and it hurt, it started to get better on the pain but then I had a super bad dizzy spell at work and they sent me to the ER.
Bad reaction1-1.5 mg/day · Injection · ~2 weeks
also on tirzepatide; ER copper test normal
Safety
Tier by safety barStrict ExcludedBalanced ExcludedEvidence only Caution
Active cancer or a history of cancer · Wilson disease or other copper-handling disorders · Liver disease · Pregnancy or breastfeeding (no human reproductive data)
Each bead is one amino acid in the peptide's chain, coloured by its side chain: grey for non-polar, cyan for polar, blue for positively charged and fuchsia for negatively charged. Length and mix tell related peptides apart at a glance, from a two-residue dipeptide like carnosine to a 43-residue protein like thymosin beta-4. The colours describe chemistry only and predict neither effect nor safety.
non-polarpolarpositivenegative
Report grades
Every first-hand Reddit or X report is graded on its own, from glowing through positive, mixed, nothing and negative to bad reaction, and the bar shows how those grades split. Posts that look vendor-adjacent stay on the peptide's page but are left out of the counts.
GlowingPositiveMixedNothingNegativeBad reaction
% positive
The share of a peptide's graded Reddit and X reports that are glowing or positive, vendor-adjacent posts left out. A peptide with few reports is pulled toward the average of all reports, as if it had eight average ones besides its own, so two glowing posts cannot top the list. Kept peptides rank by the same reports' mean grade, shrunk the same way, and excluded ones follow in that order.
Researcher estimate
No first-hand report of this peptide has been graded yet, so the figure is the researchers' own rating out of 10 from what they read about it. It ranks alongside the computed scores until reports arrive.
Safety tier
Each peptide is tiered clean, caution or excluded from its five risk axes under the chosen safety bar. An excluded peptide has a plausible route to serious harm, so it stays listed with the reason but ranks behind every other entry, however good its reviews.
Safety bar
The safety bar sets how much risk it takes to exclude a peptide. Strict: out on any serious mechanism with little human data, or any documented serious harm. Balanced: out on documented serious harm (unless it is obvious, reversible and from a regulated product), or a serious mechanism whose harm would be silent with no human data at all. Evidence only: out only on documented serious harm in humans that is lasting, delayed or from grey-market product.
Seen harm
Documented serious adverse events in humans, from 0 for none despite real exposure to 3 for deaths or several well-documented serious harms. Serious means a hospital or emergency visit or harm lasting weeks, so a headache or a bad night does not count.
Mechanism
A plausible biological route to serious harm at the doses people use, such as growth-factor signalling, hormone-axis suppression, heart or blood-pressure effects or immune activation. It runs from 0 when none is known to 3 when a dangerous pathway has been shown in living animals.
Data gap
How little human safety data exists for the molecule actually sold, from 0 for an approved drug with large trials and years of use to 3 for no human safety data at all. A modified analogue does not inherit its parent's trials.
Silent harm
Whether the feared harm would show quickly or stay hidden, from 0 when it is obvious and goes on stopping to 3 when it is silent and delayed, like tumour promotion or slow organ damage. User reports cannot reveal a harm that takes years to appear, so a high score here limits what good reviews can tell you.
Product
The risk of what people actually buy, from 0 for a regulated pharmacy or supplement product taken by mouth or on the skin to 3 for a grey-market injectable. In one dataset of 6,441 grey-market samples, 42–71% failed basic quality criteria and 15% carried endotoxin.
Evidence
The strongest kind of study behind the peptide's effects, from an approved drug through human controlled trials and small human studies to animal work or nothing of its own. Animal results often fail to carry over to people.
Access
How people get it: as an approved drug, a compounded prescription, an over-the-counter supplement or from the grey market, where nobody checks the vial. The channel decides both the legal position and the risk of a bad batch.
Price per month
Thirty days of the typical dose, from its low end to its high end, priced at the listing a careful buyer would choose: in stock, from a shop scoring 4 of 5 on trust (third-party tested where no score is set), failing that 3, a pure pack before a blend, a European shop first, then the cheapest per mg. The range is the dose's, not the shops'. A per-dose amount counts once a day unless the dose says otherwise. Prices are in euros at ECB rates of 2026-10-29, before shipping; the shop table keeps each listing's price per mg, per gram for bulk supplements. Where no listing can be priced the researchers' own estimate stands in, and says so.
Dose users report
The middle half of the daily doses stated in at least five first-hand reports, vendor posts left out. Where its middle sits more than twice above or below the declared dose, the month is priced at it as well, since what people take is what they pay for.
Testing
Whether the shop publishes lab results: third-party tested means an independent lab checks each batch, own COA means the shop's own certificate of analysis, and no public tests means neither. A certificate shows purity, not safety.
Added peptide
Some packs sold under one peptide's name hold a second one, such as 5 mg GHK-Cu in a nasal kit, stated only in the description. Sprayed in the nose or injected it reaches the blood like an injection, so it carries the risk of that route and is tiered as the injectable form, whatever its tier on the skin. A pack whose page gives no contents list may hold more than its name.