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PeptideCompanies

Best Peptide Websites: Which Vendor Sites Show You the Evidence

By , Editor · Updated · Editorial policy

Contains affiliate links. We may earn a commission on purchases. More

The best peptide websites are not the prettiest ones. They are the ones where you can confirm, before paying, what you are buying, who tested it and what happens if the order goes wrong.

Seven things a good peptide website shows you

  1. COA linked from the product page. You should reach the certificate for the lot you are buying in one click, not by emailing support.
  2. Lot number and test date on the COA. Without them you cannot tell whether the report belongs to your vial.
  3. Named third-party lab. A report from an independent lab can be checked with that lab; an unsigned in-house sheet cannot.
  4. Fill size and price shown together. So you can work out the price per mg without adding to cart.
  5. Shipping and refund pages linked in the footer. And consistent with what checkout says.
  6. One business address. The same address and entity name on the contact page, the terms and the invoice.
  7. Research-use labelling. Reputable research suppliers state clearly that products are for laboratory use only.

The websites ranked

The ranking below uses the same scores as our vendor ranking; the transparency and testing criteria carry the most weight for website quality.

Side by side

Compare all 10 companies

Facts checked 2026-11-04. Numbers are the rank by weighted score; see the methodology.

#CompanyLab reportsShippingBPC-157TrustpilotLink
PickPSPeptidesOur PickLab reportsPer lot · N.A. DiagnosticsShippingUSA · free over $200BPC-157Not publicTrustpilot4.6(268)Visit
1Core PeptidesBest for lab testingLab reportsPer lot · Vanguard LaboratoryShippingUSA · free over $200BPC-157Not publicTrustpilotNo ratingVisit
2American PeptidesMost transparentLab reportsPer lot · BioviridianShippingUSA (LA) · free over $300BPC-157$60.00 / 5 mgTrustpilot4.1(69)Visit
4Ascension PeptidesBest priceLab reportsNot confirmedShippingUSABPC-157$49.00 / 10 mgTrustpilotNo ratingVisit
5Palmetto PeptidesLab reportsPer lotShippingUSA · free over $200BPC-157$69.00 / 10 mgTrustpilotNo ratingVisit
6Pure Health PeptidesBiggest catalogueLab reportsNot confirmedShippingUSA (CA) · free over $175BPC-157Not publicTrustpilot4.5(68)Visit
7Biotech PeptidesLab reportsNot confirmedShippingNot stated · free over $200BPC-157Not publicTrustpilotNo ratingVisit
8Swiss ChemsLab reportsPer lotShippingNot stated · free over $100BPC-157Not publicTrustpilotNo ratingVisit
9Limitless Life NootropicsLab reportsPer productShippingNot statedBPC-157Not publicTrustpilot3.3(164)Visit
10Peptide PartnersLab reportsNot confirmedShippingNot statedBPC-157Not publicTrustpilotNo ratingVisit

Our pick is based on customer rating; its weighted score and rank are shown on its card. This page contains affiliate links; we may earn a commission.

Scores explained

How each company scored

PSPeptides

Our Pick#3 by score4.6(268)
57.5/ 100
Independent testing 25%
6/10COAs per batch, lab named (N.A. Diagnostics) and verifiable on its portal; wide panel; lab accreditation and independence not confirmed
Price per mg 20%
5/10Prices behind login: neutral
US shipping and speed 15%
9/10US; same day before 2 PM EST; free 2nd Day over $200, Next Day over $400
Transparency 15%
2/10No company name or address on site; NJ vs Temecula and phone/no-phone statements conflict; catalogue behind login
Refund and reship policy 10%
6/10No returns; defects in 3 days; refund + test cost if purity < 80%
Catalogue and stock 10%
5/10Not countable behind login: neutral
Customer reviews 5%
10/104.6 from 268 reviews
  • Lab reportsPer lot · N.A. Diagnostics
  • ShippingUSA · free over $200
  • RefundsNo returns; refund/exchange only for defective, broken or missing items reported within 3 days of delivery with photo+video, or full refund plus test cost if a third-party test shows wrong product or HPLC purity below 80% (claim within 30 days).

Core Peptides

Best for lab testing#1 by score
78/ 100
Independent testing 25%
10/10COAs per lot (C74112, C74113), lab named (Vanguard Laboratory, A2LA per site)
Price per mg 20%
5/10BPC-157 price range, sizes not labelled: neutral
US shipping and speed 15%
9/10US; same day before 4pm ET; USPS $12 1-3 days; free over $200
Transparency 15%
8/10Orlando address and phone; 104 products and prices public
Refund and reship policy 10%
7/10Refund requests up to 30 days; lost/damaged not covered
Catalogue and stock 10%
9/10104 products
Customer reviews 5%
3/10No Trustpilot rating recorded
  • Lab reportsPer lot · Vanguard Laboratory
  • ShippingUSA · free over $200
  • RefundsUnshipped orders can be cancelled by email; refunds may be requested up to 30 days after the order is placed.

American Peptides

Most transparent#2 by score4.1(69)
65/ 100
Independent testing 25%
8/10COAs per lot; lab named on homepage only (Bioviridian)
Price per mg 20%
4/10BPC-157 5 mg $60 ($12/mg)
US shipping and speed 15%
7/10US; 24-48 h dispatch; 2-3 days; free over $300; cutoff stated two ways
Transparency 15%
8/10Shreveport address and phone; prices public
Refund and reship policy 10%
3/10Final once shipped; damage within 72 h; no reship promise for lost
Catalogue and stock 10%
8/1076 compounds
Customer reviews 5%
7/104.1 from 69 reviews
  • Lab reportsPer lot · Bioviridian
  • ShippingUSA (LA) · free over $300
  • RefundsAll sales final once shipped; only damaged or incorrect items reported within 72 hours of delivery qualify.

Ascension Peptides

Best price#4 by score
56.5/ 100
Independent testing 25%
4/10122 COA records, lot numbers and lab not confirmed
Price per mg 20%
10/10BPC-157 10 mg $49 ($4.90/mg), lowest recorded
US shipping and speed 15%
7/10US; most within 24 h; 2-5 days; flat $15, no free threshold
Transparency 15%
5/10Phone and support hours; no address
Refund and reship policy 10%
1/10All sales final, no refunds for any reason
Catalogue and stock 10%
6/1042 products
Customer reviews 5%
3/10No Trustpilot rating recorded
  • Lab reportsNot confirmed
  • ShippingUSA · no free-shipping threshold stated
  • RefundsAll sales final: "we cannot accept returns, exchanges, or provide refunds for any reason."

Palmetto Peptides

#5 by score
55/ 100
Independent testing 25%
6/10COAs per lot; lab only 'ISO-accredited'
Price per mg 20%
8/10BPC-157 10 mg $69 ($6.90/mg)
US shipping and speed 15%
8/10US; 1-2 day processing; USPS 2-3 days; free over $200
Transparency 15%
3/10Email only; no address or phone
Refund and reship policy 10%
2/10All sales final; damage within 48 h; lost not covered
Catalogue and stock 10%
4/10About 25 products
Customer reviews 5%
3/10No Trustpilot rating recorded
  • Lab reportsPer lot
  • ShippingUSA · free over $200
  • Refunds"All Sales Are Final"; no returns or exchanges.

Pure Health Peptides

Biggest catalogue#6 by score4.5(68)
54.5/ 100
Independent testing 25%
4/10FAQ claims lot-specific COAs; no lot shown, lab not named
Price per mg 20%
5/10Single $22 price, size unclear: neutral
US shipping and speed 15%
9/10Ships from CA; same day before 11 AM PST; USPS 2-3 days; free over $175
Transparency 15%
4/10No address; domain redirects to .co; KYC required
Refund and reship policy 10%
2/10No general refund policy; insured parcels only
Catalogue and stock 10%
9/10About 134 listings
Customer reviews 5%
8/104.5 from 68 reviews
  • Lab reportsNot confirmed
  • ShippingUSA (CA) · free over $175
  • RefundsNo general return/refund policy found in FAQ; refund or replacement only for insured lost/damaged orders.

All 10 companies are scored in the full vendor ranking.