Peptide Partners is an operating vendor with strong transparency and a lot of independent test data, but most of its prices run above the market median. It names its company, its city and four testing labs. Finnrick lists 105 independent tests for it, the most recent on October 14, 2026. Outside a few items, such as BPC-157 40mg and tirzepatide, you pay more here than at the median vendor we track.
Notice: Peptide Partners' products are sold for in-vitro laboratory research only. They are not FDA-approved and not for human or animal use. This review covers supplier transparency and prices only. We didn't buy or test any products. Some vendors pay us a commission when you buy through our links. That never changes a score or a price ranking.
FDA warning letter: FDA sent Peptide Partners LLC (Sarasota, FL) a warning letter dated August 24, 2026 citing health claims for GLP-class products and SS-31 and the sale of a reconstitution solution alongside injectable peptides. The store was still live and taking orders when we checked on October 19, 2026; see our summary of the letter.
Peptide Partners at a glance
- Website: peptide.partners, live when checked on October 19, 2026.
- Based in: Sarasota, FL.
- Company: Pirsek Technologies LLC. No founding year was published on its site when we checked.
- Testing labs/COAs: names BioRegen, TrustPointe, Kovera and Chromate; COAs on its independent certifications page. Mentions endotoxin or sterility testing.
- Independent tests (Finnrick): 105 tests listed on Finnrick, most recent October 14, 2026.
- Payment: accepted methods were not published on its site when we checked.
- Gate: none recorded; products and prices were public.
- Catalog: 29 peptide products listed.
- Checked: October 19, 2026.
Prices we checked
| Peptide | Size | Price | Per mg | vs index median |
|---|---|---|---|---|
| GLP-3 Retatrutide | 24mg | $230 | $9.58 | 24% above |
| GLP-2 Tirzepatide | 40mg | $208 | $5.20 | 13% below |
| GLP-1 Semaglutide | 10mg | $285 | $28.50 | 206% above |
| BPC-157 | 40mg | $104 | $2.60 | 57% below |
| BPC-157 | 10mg | $106 (was $200) | $10.60 | 77% above |
| TB-500 | 10mg | $130 (was $230) | $13.00 | 71% above |
| GHK-Cu (out of stock) | 100mg | $150 (was $275) | $1.50 | 114% above |
| NAD+ Buffered | 900mg | $198 (was $660) | $0.22 | 69% above |
| MOTS-c | 40mg | $252 | $6.30 | 40% above |
| Semax | 30mg | $81 | $2.70 | 40% below |
| Cagrilintide | 10mg | $335 | $33.50 | 160% above |
Prices as listed on October 19, 2026. BPC-157 40mg, Semax and tirzepatide beat the median across the vendors in our price index. Semaglutide and cagrilintide are among the most expensive we track. Compare retatrutide prices, tirzepatide prices, semaglutide prices, BPC-157 prices and the full price index.
Testing and COAs
Peptide Partners keeps COAs on a dedicated independent certifications page and names four labs: BioRegen, TrustPointe, Kovera and Chromate. The site also mentions endotoxin or sterility testing. We did not confirm that its COAs list lot or batch numbers next to each certificate, so check that a report matches your vial's lot before relying on it.
The bigger point is the outside data. With 105 tests listed on Finnrick, this vendor has far more independent sampling than most of the market. Look up the specific compound there before you order.
What we like
- Named company (Pirsek Technologies LLC) and city (Sarasota, FL).
- Four testing labs named and a public certifications page.
- 105 independent tests on Finnrick, the latest dated October 14, 2026.
- Endotoxin or sterility testing mentioned.
- BPC-157 40mg at $2.60/mg, well under the index median.
What to watch
- An FDA warning letter dated August 24, 2026 about health claims and reconstitution supplies.
- Most prices sit above the index median, some by more than double (semaglutide, cagrilintide).
- Several items were out of stock when we checked, including GHK-Cu, MOTS-c 10mg and Thymosin Alpha-1.
- Large "was" prices make discounts look bigger than they are against the market.
- Payment methods weren't published, and lot-matched COAs weren't confirmed.
- The shipping page warns orders may take extra time due to high demand.
How it compares
Peptide Partners is better documented than most vendors but rarely the cheapest. See all vendors we track, check peptide deals this week, or go to our ranked list.
Bottom line
Peptide Partners scores well on disclosure: a named LLC, named labs and a large Finnrick record. Buy where its price is competitive, such as BPC-157 40mg or tirzepatide, and compare elsewhere for semaglutide and cagrilintide.
Last checked October 19, 2026.
