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Marcus Reinhardt — Chemical Researcher, Lead Analyst & Peptide Research Advisor
Marcus Reinhardt is a chemical researcher specializing in sustainable materials and advanced formulation science, with research experience in compound development and health optimization. He reviews all Peptide Insider educational content for scientific accuracy, strength of supporting evidence, and practical relevance. Editorial team.
KLOW is a four-peptide blend — GHK-Cu, BPC-157, TB-500 and KPV — sold as one 80 mg vial. People use it for skin repair, acne and scars, hair, and nagging tendon and joint injuries. It costs about $100 a vial, and at the amount most people use, a vial lasts about three weeks. Here’s what’s in it, what each peptide does, what users actually report, and what to check before you buy.
What Is KLOW?
KLOW is GLOW with one more ingredient. GLOW is GHK-Cu plus the two repair peptides BPC-157 and TB-500; KLOW adds KPV, an anti-inflammatory tripeptide, and the vial grows from 70 mg to 80 mg.
The split is roughly 50 mg GHK-Cu and 10 mg each of BPC-157, TB-500 and KPV. Amino Club’s tested lot KLW0002 came out at 52.5 / 10.4 / 10.6 / 10.3 mg — a little over label on every component. That means about 62% of every draw is the copper peptide, which is why the reconstituted solution is blue. That’s the copper, not a bad vial.
KLOW is a research compound. No trial has tested the blend itself, in people or animals, and it’s sold for laboratory use only. What exists is research on each of the four ingredients separately — and that’s uneven, so it’s worth knowing which parts are well studied and which aren’t.
The Four Peptides in KLOW and What Each One Does
GHK-Cu (about 50 mg) — skin, collagen and wound repair. The copper peptide is most of the vial and the reason KLOW is sold for skin. In people it’s mostly been studied on the skin: in a 13-patient laser-resurfacing study, patients using it rated their skin quality higher, though the objective measures showed no difference (study). Reviews credit it with boosting collagen and tissue repair (review). No human dose for injected GHK-Cu on its own has been published.
BPC-157 (about 10 mg) — tendons, ligaments and gut. The best-known repair peptide, with almost all of its evidence in rats. Human data is three small studies — a two-person IV safety pilot, a knee-injection series, and a pilot in twelve women with bladder pain who got injections during cystoscopy, ten of whom had complete relief (study).
TB-500 (about 10 mg) — recovery and healing. A fragment of thymosin beta-4, a protein your body already makes. The full protein has been given to healthy volunteers by IV with no dose-limiting side effects (trial) and tested as a topical treatment for venous leg ulcers (trial). The fragment itself hasn’t been trialed in people.
KPV (about 10 mg) — inflammation. The piece that turns GLOW into KLOW: a three-amino-acid fragment of a natural anti-inflammatory hormone that calmed gut inflammation in mouse colitis studies (study, study). No human trial yet.
What People Use KLOW For
Skin, acne and scars. The most common reason people buy it. In an explainer thread, a commenter four weeks in described years of TRT-related back acne clearing quickly and old scars fading (r/ScienceBioTechnology). Our peptides for acne guide covers the GHK-Cu side.
Hair. The most-upvoted KLOW hair post we found this year — 849 upvotes on r/tressless — shows thicker hair around weeks 6–8 (thread), though that poster was also on finasteride and two growth-hormone peptides and had lost 100 kg. More in KLOW for hair growth.
Injuries and tendons. The BPC-157 and TB-500 half of the blend. Users describe nagging injuries improving within a few weeks (r/Peptides) and shoulder and forearm tendonitis clearing up (r/NTNPerformance).
Gut and weight-loss stacks. KPV’s colitis research is the reason to pick KLOW over GLOW when gut inflammation is the goal (KLOW for gut health); some run it alongside a GLP-1 (KLOW for weight loss).
Not everyone is sold. One of the top comments in that tendonitis thread argues that at typical doses only the GHK-Cu is present in a meaningful amount — and at 4 mg of blend you do get just half a milligram each of the other three. Nobody has tested whether that’s enough.
KLOW Dosage and How Long a Vial Lasts
No trial has set a KLOW dose, so we report what people use rather than recommend one. Across seven Reddit dosing threads and 900+ comments, the most common amount is 4 mg of blend once a day, usually for 8–12 weeks then about 4 weeks off. Reports range from under 1 mg to 8 mg. On a U-100 insulin syringe:
| Water added to 80 mg | 2 mg | 4 mg | 8 mg | Vial lasts at 4 mg/day |
|---|---|---|---|---|
| 2 mL | 5 units | 10 units | 20 units | 20 days |
| 3 mL | 7.5 units | 15 units | 30 units | 20 days |
A 4 mg draw is about 2.5 mg GHK-Cu and 0.5 mg each of the other three. Every volume, what the component studies used, and how people schedule it: KLOW dosage report. Any other vial or volume: KLOW calculator.
KLOW vs GLOW vs Wolverine
Same idea at three sizes — pick by goal.
| Blend | What’s in it | Vial | Bought for |
|---|---|---|---|
| Wolverine | BPC-157 + TB-500 | varies | Injury recovery |
| GLOW | + GHK-Cu | 70 mg · $89.99 | Skin, hair, recovery |
| KLOW | + KPV | 80 mg · $99.99 | Skin and gut inflammation |
If gut inflammation or acne is the goal, the KPV is the point. If it isn’t, GLOW is $10 cheaper per vial (the vial is also 10 mg smaller).
KLOW Cost and Where to Buy
An 80 mg vial runs about $100 at list. Amino Club lists it at $99.99 — about $1.25 per milligram — and publishes a certificate for each lot that states all four amounts (lot KLW0002: 52.54 / 10.41 / 10.62 / 10.30 mg, 99.85% purity, ISO/IEC 17025 lab). That’s the one thing to insist on with a blend: one purity number and no split tells you nothing about how much of each peptide you’re getting. Live prices by cost per milligram:
Looking for Lab-Tested KLOW?
Our top-rated vendor publishes per-lot certificates from an ISO/IEC 17025 laboratory — with each of KLOW’s four components quantified separately — and offers up to 30% off your first order.
Affiliate link — it doesn’t change what we report. All compounds sold strictly for non-human research use. Read our full Amino Club review.
Frequently Asked Questions
Is KLOW the same as GLOW?
No. KLOW is GLOW plus KPV. GLOW is GHK-Cu, BPC-157 and TB-500 in a 70 mg vial; KLOW adds 10 mg of KPV for an 80 mg vial.
How much KLOW do people use?
The most-reported amount is 4 mg of blend a day — 10 units with 2 mL of water or 15 units with 3 mL — for 8 to 12 weeks, then a break. There is no trial dose; that’s what users describe, not a recommendation.
How long does a KLOW vial last?
Twenty days at 4 mg a day. Forty days at 2 mg, ten days at 8 mg.
How much does KLOW cost?
About $100 per 80 mg vial at list price. Amino Club lists it at $99.99, roughly $1.25 per milligram.
Why is my KLOW blue?
The copper in GHK-Cu, which is more than half the vial. Blue solution is normal.
Is KLOW legal?
It’s sold as a research chemical for laboratory use, not for human consumption. None of the four peptides is a controlled substance in the US, and none is an approved drug.
Sources: GHK-Cu laser-resurfacing study (PMID 16847171), GHK-Cu gene review (29986520); BPC-157 IV pilot (40131143), bladder pilot (39325560), knee series (34324435); thymosin β4 IV (20536472), venous ulcers (20536470), dry eye (25826322); KPV colitis (18061177, 28143741), KPV skin delivery (28343991). Vendor figures from Amino Club, checked September 15, 2026. Community reports are unverified and linked to their threads. Research compounds, not medicine — disclaimer.
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