A lab-made peptide, 15 amino acids long, based on a protein found in stomach juice.
Most studied for
Mostly animal studies987 study results, 12 from people
Peptides / Recovery and repair
Blend of 4 peptides
KLOW
Not approvedBanned in sport
KLOW mixes 4 peptides into one product: BPC-157, TB-500, GHK-Cu and KPV. No published study has tested KLOW itself. What we know comes from studies of the 4 peptides, and almost all of those studies were in animals or lab cells.
Also known as KLOW blend, KLOW peptide, KLOW stack
What is in KLOW4 peptides
There is no standard recipe. The amount of each peptide can change from one seller to the next.
No study has tested KLOWThe 4 peptides in KLOW have 1,373 study results between them. Only 19 come from studies in people.
What is in KLOW
The 4 peptides in KLOW
Each peptide has its own guide with all of its studies.
A short, lab-made piece of thymosin beta-4, a protein the body makes.
Most studied for
Animal and lab studies only36 study results, none from people
A tiny peptide of 3 amino acids bound to copper. The body makes it, and skin care products use it.
Most studied for
Mostly animal studies226 study results, 7 from people
The last 3 amino acids of alpha-MSH, a hormone the body makes.
Most studied for
Animal and lab studies only124 study results, none from people
Other blends with these peptides
GLOW is KLOW without KPV. Wolverine has only BPC-157 and TB-500.
Overview
Key points
- KLOW is a mix of 4 peptides: BPC-157, TB-500, GHK-Cu and KPV.
- No published study has tested KLOW, in people or in animals.
- One rat study gave BPC-157 and TB-500 together. The pair worked no better than either peptide on its own.
- Most of the research behind KLOW is on BPC-157, and most of those studies used animals. TB-500 and KPV have no published results from people yet.
- KLOW is not an approved medicine. It is banned in sport, because it contains peptides that are banned.
- A draft US policy from October 2026 covers BPC-157, TB-500 and KPV one at a time. Under it, HHS does not plan to act against licensed pharmacies that make them for a patient with a prescription. It does not cover blends like KLOW.
KLOW at a glance
The evidence
Studies of KLOW
PepBank found only one study that gave any of these peptides together. It tested BPC-157 with TB-500.
0
published studies of KLOW
Studies that gave 2 of its peptides together
1- AnimalsEffects of BPC-157 and TB-500 on Achilles tendon healing in rats: A histopathological and biomechanical study.Together, BPC-157 and TB-500 improved one tendon healing score compared with no treatment. They gave no added benefit over either peptide on its own.Rats · Joint diseases and related surgery · 2026
No study in PepBank gives GHK-Cu or KPV together with another peptide from KLOW.
How much research each peptide has
BPC-157 has far more research than the other 3. All 4 bars use the same scale, so you can compare them.
What the 4 peptides were studied for
All 4 peptides were studied for skin and wound healing and for inflammation. Almost all of these results come from animals and lab cells.
| BPC-157 | TB-500 | GHK-Cu | KPV | |
|---|---|---|---|---|
| Skin, hair and wounds7 from people | 130 | 8 | 71 | 7 |
| Heart and blood vessels | 170 | – | 6 | – |
| Stomach and gut | 128 | – | 8 | 18 |
| Immune system and inflammation | 47 | 4 | 37 | 31 |
| Brain and nerves | 95 | 8 | 1 | – |
| Muscles and tendons | 80 | 8 | 11 | – |
| Cells, genes and aging | 25 | – | 28 | 5 |
Each number counts study results. A bigger circle means more results.
Status and safety
Is KLOW approved?
No. KLOW is not an approved medicine, and none of the 4 peptides in it is an approved drug in the US.
| US FDA | Sport (WADA) | HHS draft policy | |
|---|---|---|---|
| BPC-157 | Not approved | BannedS0 | Covered on its own, with a prescription |
| TB-500 | Not approved | BannedS2 | Covered on its own, with a prescription |
| GHK-Cu | Not approved | BannedS0 | Not covered |
| KPV | Not approved | BannedS0 | Covered on its own, with a prescription |
| KLOW itself | Not approved | BannedContains banned peptides | Not covered. The policy covers one peptide per product. |
HHS published a draft policy on October 30, 2026. Under it, HHS does not plan to act against licensed pharmacies or physicians that make BPC-157, TB-500 or KPV. Each product must be for a patient with a prescription, and strict conditions apply. The policy covers one peptide per product, so it does not cover blends like KLOW. It is a draft and gives no legal rights. Public comments are open until November 13, 2026.6
Is KLOW safe?
No study has checked whether KLOW is safe.
There is little safety data on the 4 peptides. BPC-157 has 24 safety results, including 8 from people. GHK-Cu has 5, KPV has 2 and TB-500 has 1. Most come from lab cells and animals.
Quality also changes from product to product. A 2026 preprint looked at 6,441 lab tests of research peptides sold online, including BPC-157, TB-500 and GHK-Cu. Purity and the amount of peptide in each vial varied widely2.
From the community
How people use KLOW
What people say online. These are forum posts, not studies.
From 1 forum post
So far, PepBank has found one public post about KLOW. In it, a forum user says they use KLOW for recovery, along with other products.3
One post cannot show that KLOW works or that it is safe. The post also does not say how they took it, for how long, or what changed.
Questions and more
Common questions
What is KLOW?
KLOW is a blend of 4 peptides in one product: BPC-157, TB-500, GHK-Cu and KPV. It is not an approved medicine.
Has KLOW been tested in people?
No. There are no published studies of KLOW in people or in animals. The closest is one rat study that gave 2 of its peptides, BPC-157 and TB-500, together.
What does each peptide in KLOW do?
In studies, BPC-157 was tested most for the heart and blood vessels, wounds and the gut. TB-500 was tested for wounds, muscles and nerves, GHK-Cu for skin and wounds, and KPV for inflammation. Almost all of that research was in animals and lab cells.
Is KLOW banned in sport?
Yes. WADA bans BPC-157 and TB-500 by name. GHK-Cu and KPV are not named, but they fall under the WADA rule for unapproved substances. So the blend is banned too.
Can a US pharmacy make KLOW?
The HHS draft policy from October 2026 does not cover KLOW. It covers only one peptide per product, made for a patient with a prescription.
Ask a question about KLOW
The answer links to every study it uses.
Sources
- Study: Effects of BPC-157 and TB-500 on Achilles tendon healing in rats: A histopathological and biomechanical study. Joint diseases and related surgery, 2026.
- Preprint: Evaluation of research grade peptides marketed directly to consumers. Preprints.org, 2026. Not peer reviewed.
- Forum: glp1forum.com, "Older guy stack". Checked 2026-10-27.
- Regulator: WADA 2026 Prohibited List
- Regulator: TGA unapproved peptide products
- Regulator: HHS draft policy on peptides made by 503A pharmacies
- Regulator: Federal Register 2026-22192, published October 30, 2026
- PepBank: Pages for BPC-157, TB-500, GHK-Cu and KPV, as of November 5, 2026. Each page lists its own sources.
AI wrote this page from the sources above. AI can make mistakes, so check important facts against the source.
PepBank does not sell peptides, and Curo is the only shop it links to.
PepBank is a research reference. Talk to a doctor before you use any peptide.
Ask your AI about KLOW
Curo sells KLOW. PepBank and Curo have the same owner. See KLOW at Curo (opens in a new tab).