PEPTIDE CORPUS
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US domestic vendor

Peptide Sciences

Large US peptide vendor with 100+ products, in-house testing, and same-day shipping since 2012.

Last updated

Scored 7.0 7.0 of 10 overall, across 8 dimensions how scores are derived

Score breakdown

Dimension scores are editorial, carried from the operator's earlier directory — they are not user reviews. Each label links to what the dimension measures.

About Peptide Sciences

Peptide Sciences is one of the largest and longest-running US-based peptide suppliers, operating out of Henderson, Nevada since 2012. They offer over 100 research peptides with claimed purity of 99% or higher, supported by in-house HPLC and mass spectrometry testing. The company is well-known in the research peptide community for its extensive catalog spanning nearly every major peptide category, professional packaging, and same-day order processing. While their COAs are produced internally rather than by independent third-party laboratories, they remain one of the most frequently recommended vendors on peptide research forums.

Written for the operator's previous directory and reproduced unchanged (markup and emoji stripped); the rest of this site does not share its voice. Ported observed .

From the storefront

No public product feed on file. The storefront exposes no product API we can read without an account, so nothing is shown rather than something guessed.

Catalogue, as their API returns it

Their storefront has no public API we can read, so nothing is shown rather than something guessed. observed

Strengths and weaknesses

Where it does well

  • Largest US peptide catalog (100+ peptides)
  • Established since 2012
  • 99%+ purity claims
  • Fast domestic shipping with same-day processing
  • Professional website and packaging

Where it falls short

  • Internal COAs only (no third-party verification)
  • Premium pricing
  • Credit card only payment
  • Strict no-refund policy

Carried verbatim from the source directory's editorial review, observed .

Shipping

Destinations
  • United States
Countries Served
United States observed
Domestic Shipping
Varies by method observed
Estimated Delivery
Domestic: 2-5 business days observed
Free shipping
No
Reship guarantee
Not on file
Refund policy
Not on file

Payments

  • credit-card

Coupons

No current code on file. Codes are published only with the code, the discount, a source and the date we saw it, and expired codes are removed at build — the coupon policy. 0 are on file site-wide today.

Certificates of analysis

Third-party tested
No
Publicly accessible
Yes
Test types
  • HPLC
  • Mass Spectrometry
Source's COA tier
in-house

COAs are produced in-house. No independent third-party verification is provided. Each product page includes a downloadable COA showing purity and identity results. observed

A COA describes one batch's purity. It is a document about a vial, not evidence about an effect, and it never grades a claim on this site — the grading rubric names what qualifies.

Peptides listed 37

Linked names have a record here; the others we hold nothing on yet. A vendor listing a compound says nothing about the evidence for it.

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