Peptides in the US: vendors, supplies, and guides
A US-focused entry point to peptides.fyi. Rated American suppliers with third-party COAs, reconstitution supplies available on Amazon US, and evidence-first peptide guides written without the broscience. No prescriptions, no hype, no sales pitch.
Top-rated United States vendor
Ascension Peptides
Frequently recommended US peptide supplier with third-party COAs on every product. Wide catalogue of research peptides with fast domestic shipping.
- Exclusive discount with code PEPTIDESFY
- Third-party COA on every product
- Frequently cited in 2026 vendor lists
- Fast US domestic shipping
PEPTIDESFYRated US peptide suppliers
Ratings based on community feedback, third-party COAs, and publicly available information. We are not a paid reviewer of any vendor listed.
Reconstitution supplies (Amazon US)
Bacteriostatic water, insulin syringes, alcohol pads, sharps disposal, and vial storage — available with Amazon Prime shipping in the US.
Reconstitution kit
Bacteriostatic water + insulin syringes, bundled
View on Amazon United States ↗Alcohol prep pads
Individually wrapped sterile pads, 200+ count
View on Amazon United States ↗Sharps disposal
FDA-cleared sharps containers for safe needle disposal
View on Amazon United States ↗Peptide storage
Mini fridges, vial cases, and travel coolers
View on Amazon United States ↗Amazon links are affiliate links — peptides.fyi earns a small commission at no extra cost to you.
Frequently asked questions
Where do peptides ship from in the United States?
US peptide suppliers typically ship from domestic warehouses in California, Nevada, or Texas via USPS Priority. Delivery is usually 1 to 3 business days within the continental US. Both Ascension Peptides and Apollo Peptide Sciences operate this model and provide third-party certificates of analysis on every product.
Are research peptides legal to purchase in the United States?
Research peptides are legal to purchase from US-based vendors when sold for laboratory research use only. They are not approved for human use by the FDA outside of clinical trials or FDA-approved prescriptions. Buyers are responsible for complying with federal and state regulations regarding possession and intended use.
What is a certificate of analysis (COA) and why does it matter?
A certificate of analysis (COA) is a third-party laboratory report showing the identity, purity, and contaminant profile of a peptide batch. Reputable US vendors publish batch-specific COAs verifying purity via HPLC (high-performance liquid chromatography) and mass spectrometry. Always verify the COA is independent and matches the batch number on your vial.
Which peptides are most researched for longevity and recovery?
The most researched peptides for longevity include Epithalon (telomere research), SS-31 / elamipretide (mitochondrial function), and MOTS-c (metabolic and exercise response). For recovery and tissue repair, BPC-157 and TB-500 have the largest published literature. GHK-Cu has decades of research for skin and collagen synthesis.
Keep reading
Disclaimer: peptides.fyi is an educational resource and does not sell peptides. We do not provide medical advice. Research peptides are not FDA-approved for human use outside of clinical trials or prescriptions. Always consult a qualified healthcare professional before starting any protocol. Vendor listings reflect community feedback and publicly available information at the time of writing and are not paid endorsements. 6 total vendors tracked across five countries.