Peptides Source pairs strong testing disclosure with low prices on many compounds, but limited payment options. As of October 19, 2026 it names four testing labs, publishes COAs with lot numbers and lists a Philadelphia address and phone. Its larger retatrutide sizes are well under the median in our price index. It doesn't publish a company name, and we found no independent Finnrick tests.
Notice: Peptides Source's 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.
Peptides Source at a glance
- Website: peptidessource.com, live when checked.
- Based in: not stated as a headquarters, but the site footer lists Philadelphia, PA 19102, phone 215-859-5900 and info@peptidessource.com.
- Company: no legal entity name or founding year published on its site when we checked on October 19, 2026.
- Testing labs/COAs: names Freedom Diagnostics, Vanguard, Bioviridian and Accumark; a COA page with lot numbers.
- Independent tests (Finnrick): none found.
- Payment: Zelle, Venmo, crypto.
- Gate: none.
- Catalog: 60 peptide products listed.
- Checked: October 19, 2026.
Prices we checked
| Peptide | Size | Price | Per mg | vs index median |
|---|---|---|---|---|
| GLP-3 (RTA) (retatrutide) | 15mg | $135.00 | $9.00 | 16% above |
| GLP-3 (RTA) (retatrutide) | 40mg | $270.00 | $6.75 | 13% below |
| GLP-3 (RTA) (retatrutide) | 100mg | $400.00 | $4.00 | 48% below |
| BPC-157 | 15mg | $60.00 | $4.00 | 33% below |
| TB-500 | 10mg | $70.00 | $7.00 | 8% below |
| GHK-Cu | 100mg | $70.00 | $0.70 | at median |
| NAD+ | 1000mg | $80.00 | $0.08 | 38% below |
| MOTS-c | 30mg | $100.00 | $3.33 | 26% below |
| Cagrilintide | 10mg | $90.00 | $9.00 | 30% below |
| Sermorelin | 10mg | $50.00 | $5.00 | 41% below |
| Tesamorelin | 32mg | $200.00 | $6.25 | 20% below |
| Semax | 10mg | $50.00 | $5.00 | 11% above |
Prices as listed on October 19, 2026. Retatrutide gets cheaper per mg as the size grows: the 30mg size ($235) is about at the median, and everything from 40mg up is below it. Most other compounds were below or near the median. See retatrutide prices, BPC-157 prices and NAD+ prices, or the full price index.
Testing and COAs
Peptides Source publishes a certificates page and a separate "COA and testing explained" page. Certificates appear with lot or batch numbers, and the site mentions endotoxin or sterility testing. It names four labs: Freedom Diagnostics, Vanguard, Bioviridian and Accumark. We haven't verified those labs' reports.
What's missing: we found no Finnrick tests, so there are no customer-submitted independent results to check against the vendor's own certificates.
What we like
- Four testing labs named on the site.
- Lot-matched COAs, plus endotoxin or sterility testing mentioned.
- Retatrutide from $4.00 per mg at the 100mg size, and many other compounds below the index median.
- A 60-product catalog with no gate.
- A published address, phone number and email.
What to watch
- Payment is limited to Zelle, Venmo and crypto. We didn't see card payments.
- No company name or founding year published.
- No independent Finnrick tests found.
- Free shipping starts at $340, a high threshold.
- Some listings were out of stock, including Epithalon 100mg and MOTS-c 12mg.
How it compares
Peptides Source's larger retatrutide sizes sit well below the median in our index, and it names four testing labs. Compare it against all vendors we track, check peptide deals this week or see our ranked list.
Bottom line
Peptides Source names its labs, publishes lot-matched COAs and prices many compounds below our index median. The trade-offs are no card payments, no named company and no independent Finnrick data yet.
