PeptideChecked
Visit #1: PeptidologyVisit #1
Updated September 2026 · 5 vendors

Every research peptide vendor we’ve reviewed

All 5 vendors in one place, sorted by overall score. Compare what each one costs and does best, then open the full review or go straight to the site.

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By PeptideChecked editorial team
How we rank

All vendors

Sorted by overall score

  • Peptidology

    peptidology.co

    #1

    Lot-numbered COAs from named labs, dated to Sep 2026

    Overall score
    8.1/10
    Payment
    Not published publicly
    Best overallNo Trustpilot yet

  • Limitless Biotech

    limitlesslifenootropics.com

    #2

    Batch COAs covering purity, sterility and endotoxin

    Overall score
    7.6/10
    Payment
    Visa, Mastercard, Amex, Discover
    Multi-test documentation per batchNo Trustpilot yet

  • Ascension Peptides

    ascensionpeptides.com

    #3

    Searchable COA library with 85 records, US-only shipping

    Overall score
    6.4/10
    Payment
    Not verified
    Searching COAs by batch/lotNo Trustpilot yet

  • Core Peptides

    corepeptides.com

    #4

    Large catalog; COA images, lab not clearly named

    Overall score
    5.0/10
    Payment
    Cards (Mastercard shown)
    Catalog breadth, lower transparencyNo Trustpilot yet

  • Biotech Peptides

    biotechpeptides.com

    #5

    Recent COA images, no named lab or community tests

    Overall score
    4.6/10
    Payment
    Credit card (per site title)
    Research-use framing, limited proofNo Trustpilot yet

Not sure which to pick?

See our top picks ranked with a side-by-side comparison and buyer’s guide.

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