Nextday Peptides publishes detailed testing information, but has no independent test record yet. As of October 19, 2026, it names its company, five testing labs and matches COAs to lot numbers. Its semaglutide and 20mg tirzepatide listings were below the median across the vendors in our price index, while BPC-157, TB-500 and GHK-Cu cost more. We found no Finnrick tests for it, and all sales are final.
Notice: Nextday Peptides' 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. 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.
Nextday Peptides at a glance
- Website: nextdaypeptides.com, live when checked.
- Based in: not published on its site when we checked on October 19, 2026. The site says it ships from USA warehouses.
- Company: Nextday Sciences LLC. No owner or founding year published.
- Testing labs/COAs: Janoshik, Freedom Diagnostics, Krause, Pharmlabs and Harrens named; lot-matched COA page.
- Independent tests (Finnrick): we found no Finnrick tests for Nextday Peptides.
- Payment: Zelle, Venmo, Cash App, Bitcoin; check or money order also mentioned.
- Gate: none found.
- Catalog: 9 peptide products listed.
- Checked: October 19, 2026.
Prices we checked
| Peptide | Size | Price | Per mg | vs index median |
|---|---|---|---|---|
| Tirzepatide (listed as GLP2-Tirz) | 10mg | $92.50 | $9.25 | 55% above |
| Tirzepatide (listed as GLP2-Tirz) | 20mg | $110.00 | $5.50 | 8% below |
| Semaglutide (listed as GLP1-Sema) | 10mg | $75.00 | $7.50 | 24% below |
| Semaglutide (listed as GLP1-Sema) | 20mg | $92.50 | $4.62 | 53% below |
| BPC-157 | 10mg | $75.00 | $7.50 | 25% above |
| BPC-157 | 20mg | $127.50 | $6.38 | 6% above |
| TB-500 | 10mg | $110.00 | $11.00 | 47% above |
| BPC-157 + TB-500 | 10mg | $110.00 | $11.00 | 85% above |
| BPC-157 + TB-500 | 20mg | $162.50 | $8.12 | 37% above |
| GHK-Cu | 50mg | $75.00 | $1.50 | 113% above |
| GHK-Cu | 100mg | $110.00 | $1.10 | 56% above |
| NAD+ | 500mg | $75.00 | $0.15 | 15% above |
Prices as listed on October 19, 2026. Both semaglutide sizes and the 20mg tirzepatide came in below the median across the vendors in our price index, while the 10mg tirzepatide and every BPC-157, TB-500, blend, GHK-Cu and NAD+ listing cost more. Compare semaglutide prices, tirzepatide prices, BPC-157 prices and GHK-Cu prices in our price index.
The site notes that packaging and vial labels may vary from the images shown.
Testing and COAs
Nextday Peptides has a COA page with lot or batch numbers shown alongside the certificates. The site names five labs: Janoshik, Freedom Diagnostics, Krause, Pharmlabs and Harrens. Lot matching lets you tie a certificate to a specific batch, which is more useful than a single sample certificate per product. We named the labs as they appear on the site; we didn't verify the reports with the labs.
What's missing: any mention of endotoxin or sterility testing, and independent data. We found no Finnrick tests for Nextday Peptides, so there are no customer-submitted samples to compare with its own certificates.
Shipping, payment and returns
The site says orders ship from USA warehouses and publishes a shipping and delivery policy. Payment options include Zelle, Venmo, Cash App and Bitcoin, plus check or money order. Accepted methods are shown at checkout.
Returns are the weak spot. Its policy says all sales are final, except where required by law, and it does not accept returns or exchanges on research compounds.
What we like
- Company name published: Nextday Sciences LLC.
- Five testing labs named on the site.
- COAs matched to lot or batch numbers.
- Semaglutide and 20mg tirzepatide priced below the index median.
- Several payment options, including check or money order.
- Published shipping, payments and terms pages, plus an FAQ and updates page.
What to watch
- No Finnrick tests found, so no independent check yet.
- All sales final; no returns or exchanges.
- BPC-157, TB-500, GHK-Cu and NAD+ priced above the index median, GHK-Cu 50mg by 113%.
- No business address or owner published.
- A small catalog of 9 products.
How it compares
Nextday Peptides names five labs and matches COAs to lots, but it has no independent test record and a strict no-returns policy. On price it is competitive for semaglutide and larger tirzepatide vials, and dearer than the median for the other compounds we priced. See all vendors we track, peptide deals this week and our ranked list.
Bottom line
On COA disclosure, Nextday Peptides does well: a named LLC, five named labs and lot-matched certificates. The trade-offs are no Finnrick data, no returns and above-median prices outside its GLP-class listings. Check the COA for the exact lot you'd receive before ordering.
Last checked October 19, 2026.
