NextDay Peptides
≥99% HPLC purity with public COA library
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About NextDay Peptides
NextDay Peptides (Nextday Sciences LLC) is a US-based research peptide supplier headquartered in St. Petersburg, Florida. They offer high-purity peptides with ≥99% HPLC verification, a public COA library, and same-day shipping for orders placed before 1:00 PM EST. Their catalog includes GLP-1 agonists (semaglutide, tirzepatide, retatrutide), healing peptides (BPC-157, TB-500), and specialty compounds like PEG-MGF, LL-37, and GHRP-6. All products are labeled for research use only and shipped via USPS 2-Day to US addresses. Free shipping on orders over $300 (singles) or $500 (boxes).
Score Breakdown
Pros & Cons
Pros
- ≥99% HPLC purity on all peptides
- Public COA library with searchable documentation
- Same-day shipping for orders before 1:00 PM EST (Mon–Sat)
- USPS 2-Day standard delivery
- Free shipping on $300+ singles and $500+ boxes
- Broad catalog including GLP-1 agonists and healing peptides
- Discreet protective packaging
- RUO-compliant labeling
Cons
- US shipping only — no international orders
- Limited brand recognition in the research community
- Some product COAs only available for box orders
Product Catalog
| Product | Size | Price | $/mg | Purity | COA | Stock |
|---|---|---|---|---|---|---|
| BPC-157 Peptide Guide: Healing & Research Insight | 5.0mg | $53.50 | $10.70 | >=99% | — | In Stock |
| GHRP-6 | 10.0mg | $374.50 | $37.45 | >=99% | — | In Stock |
| LL-37 | 5.0mg | $80.25 | $16.05 | >=99% | — | In Stock |
| Peptide PEG MGF: Benefits, Research & Safety Guide | 5.0mg | $304.95 | $60.99 | >=99% | — | In Stock |
| Semaglutide Weight Loss & Diabetes: Key Guide | 5.0mg | $80.25 | $16.05 | >=99% | — | In Stock |
| TB-500 Thymosin Beta 4: Benefits, Risks & Dosage | 5.0mg | $80.25 | $16.05 | >=99% | — | In Stock |
| Tirzepatide Weight Loss Guide: Effective GLP-1 Dual Agonist | 5.0mg | $128.40 | $25.68 | >=99% | — | In Stock |
Reviews
Ordered AOD-9604 from NextDay Peptides. The COA checked out against the batch number on the vial. Shipping took about a week, slower than some suppliers. Customer service was helpful when I asked about the order status. Pricing is competitive and the paperwork was complete.
First order from NextDay Peptides. It arrived quickly, but the COA appeared to have been produced in-house rather than by an independent lab, and no external testing lab was named. fwiw, i couldn't confirm the batch against an external certificate, so I asked about it. Customer service was friendly and prices are good. That documentation gap is what I'd check first next time. Anyone else?
NextDay Peptides ships a batch-matched COA with the order and the certificate names the external lab that ran the analysis. Shipping was quick and the batch number on the certificate matched the vial. Pricing is on the higher side; comparing a few suppliers before committing is worth it. This entry records a supplier-service and documentation experience. It reports no outcome and names no amount. PepsReview does not host reports of personal use of research compounds, and nothing here is a recommendation to use any product.
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