Also known as: Klow Stack, Gut + Skin Stack, KPV / GHK-Cu / BPC / TB-500 Combo, KLOW
Half-life: KPV ~minutes; BPC-157 ~4 h; TB-500 ~6-8 h; GHK-Cu ~minutes systemically
Last reviewed: · Published:
The Klow Blend is a four-peptide research formulation that adds KPV (Lys-Pro-Val) to the Glow trio. The "K" in Klow refers to KPV, an alpha-MSH C-terminal tripeptide with potent anti-inflammatory activity that complements the existing GHK-Cu + BPC-157 + TB-500 framework. The most common version sold by UK suppliers (and the one this article is anchored to) totals roughly 80 mg of peptide across the four components: 50 mg GHK-Cu, 10 mg KPV, 10 mg BPC-157, and 10 mg TB-500.
The intent of the stack is to layer KPV's NF-κB suppression on top of the existing healing and cosmetic mechanisms — giving the user a broader anti-inflammatory ceiling while keeping all of the soft-tissue and skin benefits of the Glow Blend. KPV is particularly well-studied in inflammatory bowel disease models and on inflamed-skin conditions, so the Klow Blend is favoured by people running it for systemic inflammation, gut-skin axis issues (rosacea, eczema flares), or stubborn dermatological recovery after the basic Glow stack has plateaued.
No published clinical studies exist of the four-peptide formulation. The evidence base is entirely component-by-component. All four peptides are unapproved research chemicals globally; BPC-157 and TB-500 are prohibited by WADA. Sold as a single lyophilised vial intended for one-step reconstitution.
KPV was characterised as the active C-terminal tripeptide of alpha-melanocyte-stimulating hormone (α-MSH) in the late 1990s and early 2000s, with research groups demonstrating its anti-inflammatory activity in colitis and dermatitis models. GHK-Cu, BPC-157, and TB-500 each have their own decades-long research histories (see component articles).
The "Klow Stack" naming convention emerged on peptide-research forums around 2022-2024, following the popularity of the simpler "Glow" three-peptide blend. UK research-chemical suppliers (notably my-peptides.co.uk) began co-packaging the four-peptide formulation in single vials in 2024-2025 to simplify dosing for users who had previously been juggling four separate reconstitutions and injection schedules.
Each component is well tolerated individually. KPV in particular has a clean safety profile across published colitis and dermatitis studies. Side effects from the blend are the union of those for each component — most commonly injection-site reactions, transient lightheadedness, and occasional flushing. People with copper sensitivity, Wilson's disease, or active melanoma should avoid this stack (the copper component and any MSH-axis activity warrant caution). No safety data exists for the combined four-peptide blend at clinical-trial standard.
Dose Range
500 mcg KPV + 250 mcg BPC + 2 mg TB-500 + 1-2 mg GHK-Cu
Frequency
KPV + BPC + GHK daily, TB-500 twice weekly
Duration
6-8 weeks
Dose Range
500 mcg KPV + 250 mcg BPC + 1 mg TB-500 + 1 mg GHK-Cu
Frequency
Daily, with TB-500 weekly
Duration
8-12 weeks
Dose Range
500 mcg KPV + 250 mcg BPC + 1 mg TB-500 + 1 mg GHK-Cu
Frequency
KPV + BPC 3-4x weekly, others weekly
Duration
Ongoing cycles
Dosing information is for educational purposes only. Consult a healthcare professional before using any peptide.
Typical Vial Size
80 mg
Water Type
Bacteriostatic water (BAC water)
Mixing Volume
3 mL
Half-Life
KPV ~minutes; BPC-157 ~4 h; TB-500 ~6-8 h; GHK-Cu ~minutes systemically
Molecular Weight
Blend (combined 4 peptides)
Co-packaged 80 mg vials are typically reconstituted with 3 mL BAC water — GHK-Cu dominates the volume due to its 50 mg loading. Per-component dosing varies wildly across the four peptides; use the calculator carefully. Store refrigerated at 2-8°C and protect from light. Use within 28 days.
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FDA Status
No component FDA approved for human use. FDA issued a warning letter in 2024 regarding compounded BPC-157 products.
Legal Status
All four components are unregulated research chemicals. BPC-157 and TB-500 prohibited by WADA. KPV not specifically scheduled but unapproved.
USA
Not approvedFDA warning on BPC-157 compounded products; other components unapproved
EU
Not approvedNot authorized as medicinal products
UK
Not approvedAll four classified as research chemicals
Australia
Not approvedTB-500 banned in racing; remaining components not evaluated
Russia
Not approvedAvailable as research compounds
Canada
Not approvedHealth Canada has not authorized injectable forms
Dalli J, Norling LV, Renshaw D, Cooper D, Leung KY, Perretti M
Blood (2008)
Background reference: short MSH-derived tripeptides modulate inflammation systemically — supports the mechanistic rationale for KPV's anti-inflammatory contribution.
View Study →Pickart L, Vasquez-Soltero JM, Margolina A
Cosmetics (2015)
Component review: GHK-Cu modulates antioxidant gene expression and contributes to skin regeneration — the mechanistic basis for the cosmetic component.
View Study →Chang CH, Tsai WC, Lin MS, Hsu YH, Pang JH
Molecules (2014)
Component study: BPC-157 upregulates GH receptor expression in tendon fibroblasts — basis for the tendon-healing contribution.
View Study →Bock-Marquette I, Saxena A, White MD, DiMaio JM, Srivastava D
Nature (2004)
Component study: Thymosin Beta-4 (parent of TB-500) promotes cell migration and survival in injury repair.
View Study →Gastric pentadecapeptide with broad tissue-healing properties.
Synthetic fragment of Thymosin Beta-4 with potent tissue repair activity.
Copper-binding tripeptide with potent wound-healing, skin-remodeling, and gene-regulatory properties.
Anti-inflammatory tripeptide derived from alpha-melanocyte stimulating hormone.
Wolverine's healing duo plus GHK-Cu — soft-tissue recovery with a cosmetic kicker for skin, hair, and scars.
The classic recovery stack — BPC-157 paired with TB-500 for accelerated tissue repair.
Track Klow Blend (KPV + LL-37 / TB-500 + BPC-157 + GHK-Cu) and more with PinnyPeptide.
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