Best Peptide Vendors (November 2026): Scored on Testing, Price and Policy

Q: Who is the best peptide vendor?

The first row is our pick, PSPeptides, the vendor with the best customer rating, shown with its real score. The numbered rows are ordered by weighted score on our seven criteria at the date shown, so #1 is the highest-scoring company. Scores change when prices, policies or published lab results change, so check the date next to each vendor.

Q: What is a lot-level COA?

A certificate of analysis tied to one production lot, showing the lot number, the test date, the lab that ran it and the measured purity and identity. A single COA reused across many lots tells you much less.

Q: Why is a vendor missing from the ranking?

A vendor is only ranked when every criterion has been checked. Vendors still being checked are listed under the table, and closed vendors are removed.

By James Tod, Editor · Updated November 4, 2026 · Editorial policy

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

A peptide vendor is only as good as the evidence behind its vials. This ranking puts independent, lot-level lab testing first and then compares price, shipping and how clearly each company states its policies.

Our picks

The best research peptide companies, by what matters to you

PSPeptides research vials on a lab bench — Photo: PSPeptides

Our Pick

PSPeptides

Best-rated by customers

4.6(268)

4.6 out of 5 from 268 Trustpilot reviews, the highest rating we recorded, with same-day US shipping on orders before 2 PM EST and batch COAs you can look up on the lab's site.

Ships same day on orders before 2 PM EST
Batch COAs, verifiable on the lab's site
Refund plus test cost if purity tests below 80%
Cards, Apple Pay, Klarna, Zelle and more

Visit PSPeptides See the details

Best for lab testingCore PeptidesLot COAs from a named, accredited lab

Best priceAscension PeptidesLowest BPC-157 price we recorded

Most transparentAmerican PeptidesAddress, phone and named lab

Biggest cataloguePure Health PeptidesAbout 134 listings

Side by side

Compare all 10 companies

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

#CompanyLab reportsShippingBPC-157Trustpilot

Pick

PSPeptidesOur PickLab reportsPer lot · N.A. DiagnosticsShippingUSA · free over $200BPC-157Not publicTrustpilot4.6(268)Visit

Core PeptidesBest for lab testingLab reportsPer lot · Vanguard LaboratoryShippingUSA · free over $200BPC-157Not publicTrustpilotNo ratingVisit

American PeptidesMost transparentLab reportsPer lot · BioviridianShippingUSA (LA) · free over $300BPC-157$60.00 / 5 mgTrustpilot4.1(69)Visit

Ascension PeptidesBest priceLab reportsNot confirmedShippingUSABPC-157$49.00 / 10 mgTrustpilotNo ratingVisit

Palmetto PeptidesLab reportsPer lotShippingUSA · free over $200BPC-157$69.00 / 10 mgTrustpilotNo ratingVisit

Pure Health PeptidesBiggest catalogueLab reportsNot confirmedShippingUSA (CA) · free over $175BPC-157Not publicTrustpilot4.5(68)Visit

Biotech PeptidesLab reportsNot confirmedShippingNot stated · free over $200BPC-157Not publicTrustpilotNo ratingVisit

Swiss ChemsLab reportsPer lotShippingNot stated · free over $100BPC-157Not publicTrustpilotNo ratingVisit

9Limitless Life NootropicsLab reportsPer productShippingNot statedBPC-157Not publicTrustpilot3.3(164)Visit

Peptide 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.

Biotech Peptides

#7 by score

50.5/ 100

Independent testing 25%: 3/10COA images per size, no lot numbers, lab not named
Price per mg 20%: 5/10Range $52-92, sizes not labelled: neutral
US shipping and speed 15%: 6/10Free USPS Priority over $200; ship-from not stated; cutoff stated two ways
Transparency 15%: 7/10Las Vegas address and phone; prices public
Refund and reship policy 10%: 7/10'30-day refund'; lost orders resent free, damaged replaced
Catalogue and stock 10%: 5/10Size not stated: neutral
Customer reviews 5%: 3/10No Trustpilot rating recorded

Lab reportsNot confirmed
ShippingShip-from not stated · free over $200
Refunds"30 day refund guaranteed" but "we do NOT accept returns".

Swiss Chems

#8 by score

50.5/ 100

Independent testing 25%: 6/10Reports by batch ID; lab not named
Price per mg 20%: 5/10Per-size prices not visible: neutral
US shipping and speed 15%: 7/10Free US over $100; 3-5 days; same-day claim unexplained
Transparency 15%: 3/10Phone; no address
Refund and reship policy 10%: 4/10Peptides non-returnable; free reship for missing/wrong/damaged; no cover for seized
Catalogue and stock 10%: 5/10Size not countable: neutral
Customer reviews 5%: 3/10No Trustpilot rating recorded

Lab reportsPer lot
ShippingShip-from not stated · free over $100
RefundsPeptides are non-returnable; eligible unopened SARMs/PCTs/MEPs returnable within 7 business days for store credit, or cash refund less 15% restocking fee per item and a $25 fee.

Limitless Life Nootropics

#9 by score3.3(164)

41.5/ 100

Independent testing 25%: 3/10HPLC COAs per product, no lot numbers, lab not named
Price per mg 20%: 5/10Prices behind login: neutral
US shipping and speed 15%: 4/103-5 business days processing on standard; paid shipping only
Transparency 15%: 2/10No address; prices behind login
Refund and reship policy 10%: 5/10Unopened items within 10 days
Catalogue and stock 10%: 8/1090+ peptides (own claim)
Customer reviews 5%: 4/103.3 from 164 reviews

Lab reportsPer product
ShippingShip-from not stated · no free-shipping threshold stated
RefundsAccepts unopened and unused bottles returned within 10 days of receipt.

Peptide Partners

#10 by score

32/ 100

Independent testing 25%: 2/10COA format not visible; lab not named
Price per mg 20%: 5/10Prices behind account: neutral
US shipping and speed 15%: 3/10Speed not stated before checkout
Transparency 15%: 2/10Phone only; catalogue behind account
Refund and reship policy 10%: 3/10Refund only before shipping; damage replacement at discretion
Catalogue and stock 10%: 5/10Not visible: neutral
Customer reviews 5%: 3/10No Trustpilot rating recorded

Lab reportsNot confirmed
RefundsFull refund if cancelled before shipment; once shipped, no cancellation or refund.

What separates good peptide vendors from the rest

1. Testing you can check

Look for a COA per lot from a named lab, not a generic in-house sheet. The lot number on the COA should match the lot on the label. Labs such as Janoshik, Finnrick and Freedom Diagnostics publish reports that can be verified.

2. Price per mg, not price per vial

Vial sizes differ, so compare the price per milligram. A low vial price on a smaller fill can cost more per mg than a larger vial elsewhere.

3. A real company behind the site

One business address, a legal entity name, a working contact channel and written terms. Conflicting addresses across pages are a warning sign.

4. Policies in writing

Shipping times, what happens with a lost or damaged parcel, and whether the vendor reships. If it is not written down, assume it is not offered.

For a step-by-step check before ordering, see the best place to buy peptides online.

Frequently asked questions

Who is the best peptide vendor?

The first row is our pick, PSPeptides, the vendor with the best customer rating, shown with its real score. The numbered rows are ordered by weighted score on our seven criteria at the date shown, so #1 is the highest-scoring company. Scores change when prices, policies or published lab results change, so check the date next to each vendor.

What is a lot-level COA?

A certificate of analysis tied to one production lot, showing the lot number, the test date, the lab that ran it and the measured purity and identity. A single COA reused across many lots tells you much less.

Why is a vendor missing from the ranking?

A vendor is only ranked when every criterion has been checked. Vendors still being checked are listed under the table, and closed vendors are removed.