KLOW is a vendor trade name for an 80mg research peptide blend: GHK-Cu 50mg, BPC-157 10mg, TB-500 10mg and KPV 10mg in one vial. It isn't an approved drug or a standardized product, nobody has published a study of the four-peptide combination that we could find, and on October 21, 2026 the median listed price was $1.66 per mg, about $133 for 80mg.
Notice: Research peptides are sold for in-vitro laboratory research only. They are not FDA-approved, not for human or animal consumption, and this page is not medical advice. It contains no dosing or use guidance.
Facts checked October 29, 2026, unless another date is shown.
What's in a KLOW vial
"KLOW" is shared by many vendors, so the label is the only definition. The standard version, as Ascension Peptides, PSPeptides and Peptide Plugs list it, looks like this:
| Component | Amount | What it is | Our explainer |
|---|---|---|---|
| GHK-Cu | 50 mg | Copper-binding tripeptide (glycyl-histidyl-lysine), also used in cosmetics | What is GHK-Cu? |
| BPC-157 | 10 mg | Synthetic 15-amino-acid peptide based on a gastric-juice protein fragment | What is BPC-157? |
| TB-500 | 10 mg | Seven-amino-acid fragment (LKKTETQ) of thymosin beta-4, per FDA | What is TB-500? |
| KPV | 10 mg | Lys-Pro-Val tripeptide from the end of alpha-MSH | What is KPV? |
| Total | 80 mg |
Sources: Ascension's KLOW page (product name "GHK-Cu 50mg + BPC-157 10mg + TB-500 10mg + KPV 10mg (KLOW 80mg)"), PSPeptides' KLOW page and Peptide Plugs' KLOW 80mg page.
Watch for variants that share the name. Peptide Plugs also sells KLOW PRO, an 80mg vial with a different ratio (BPC-157 20mg, TB-500 20mg, GHK-Cu 30mg, KPV 10mg). Some listings in our KLOW price index are double-size 160mg vials, and others add extra compounds to the name. Compare price per mg, and only compare like-for-like ratios.
KLOW vs GLOW
KLOW is GLOW plus KPV. GLOW is the same GHK-Cu 50mg, BPC-157 10mg and TB-500 10mg in a 70mg vial; KLOW adds 10mg of KPV. Many vendors sell both side by side, and the two names are easy to mix up on a label or an invoice, so check the product name and total mg on the certificate.
What research exists
The short answer: research on each ingredient, almost none on the blend. A web search on October 29, 2026 for studies of the GHK-Cu, BPC-157, TB-500 and KPV combination returned vendor pages and marketing sites, not peer-reviewed papers. Here is what each component's literature covers:
- GHK-Cu: the most-cited overview is a 2018 review whose lead author is listed with a skin-care company. It groups the work into cell studies, rodent and rabbit wound models, small cosmetic studies of creams and computational gene-expression analyses. FDA says there are limited human data to inform safety for injectable forms.
- BPC-157: a 2019 review in Cell and Tissue Research found studies "predominantly limited to small animal models." A 2025 HSS Journal review counted 35 preclinical studies and one small retrospective case series among 36 papers.
- TB-500: FDA's compounding safety page says it "has not identified any human exposure data" for drug products containing the fragment. Most human work concerns full-length thymosin beta-4, a different molecule.
- KPV: the key papers, such as Dalmasso et al. in Gastroenterology (2008), are cell-culture and mouse colitis studies. We found no published randomized human trial.
Animal and cell findings don't tell you how four peptides behave together in one vial, including whether they stay stable side by side. That's an open question the published record doesn't answer.
Regulatory status (October 2026)
- No approval. None of the four components is an FDA-approved drug, and neither is the blend.
- Compounding reviews. FDA's July 2026 Pharmacy Compounding Advisory Committee voted to recommend BPC-157, TB-500 and KPV for the 503A bulks list. The votes are non-binding and concern licensed pharmacies, not research vendors; FDA hadn't acted on them as of October 21, 2026. FDA says it is still evaluating non-injectable GHK-Cu. Details: FDA peptide regulation in 2026.
- Sport. TB-500 is named under S2.3 of WADA's 2026 Prohibited List, so a KLOW vial contains a substance prohibited at all times for athletes.
How much KLOW costs
Our KLOW price index checked October 21, 2026 found 71 vendors with KLOW in stock, a median of $1.66 per mg (about $133 per 80mg vial) and a range of $0.56 to $5.00 per mg. We rechecked the rated vendors' own product pages on October 29, 2026:
| Vendor | Size | Price | $/mg | Our code | After code |
|---|---|---|---|---|---|
| Peptide Plugs | 80 mg | $75 | $0.94 | None | - |
| PSPeptides | 80 mg | $109.99 | $1.37 | CHECKED (10%) | $98.99 |
| Alpha Pro Peptides | 80 mg | $110 (Oct 21) | $1.37 | None | - |
| Ascension Peptides | 80 mg | $120 (was $199.99) | $1.50 | AFFILIATE50OFF (50%, first order) | $60.00 |
| Blank Peptides | 80 mg | $149 (Oct 21) | $1.86 | CHECKED (10%) | $134.10 |
| Licensed Peptides | 80 mg | $199.99 (was $222.22) | $2.50 | Affiliate5 (5%) | $189.99 |
| American Peptides | 80 mg | $200 (Oct 21) | $2.50 | None | - |
Prices are single-vial list prices including any displayed sale, before shipping. Rows marked Oct 21 come from our weekly index; Blank Peptides shows prices only to signed-in members. "After code" is arithmetic, not a checkout quote, and we couldn't confirm whether any code applies on top of a sale price. Peptide Plugs' KLOW PRO was $100. Codes: peptide coupon codes.
Disclosure: PeptideChecked has affiliate relationships with several vendors above, including PSPeptides, Blank Peptides, Ascension Peptides and Licensed Peptides. We may earn a commission if you buy through our links or use our codes. That doesn't change any rating, which comes only from our published method.
How to check a KLOW certificate
A blend needs one certificate that covers all four peptides in the same vial, not four single-compound reports.
- Every component named and measured. PSPeptides' and Peptide Plugs' KLOW certificates report an amount for each peptide, according to our GLOW and KLOW vendor comparison.
- Amounts add up to the label. That comparison found one vendor's KLOW certificate totaling 97.87mg against an 80mg label.
- The batch matches your vial, and the report is the newest one listed.
Our COA guide and COA checklist walk through each field.
Bottom line
KLOW is a naming convention, not a defined product: an 80mg vial of four research peptides with no approval and no published study of the combination. Prices vary more than fourfold per mg, and certificate quality varies too, so compare the blend-specific COA before the price. For the vendor-by-vendor breakdown, see GLOW and KLOW blend vendors.
