NOT MEDICAL ADVICE. No information on this site should be considered medical advice. Research peptides are not intended for human consumption — in-vitro lab use only. Consult a physician prior to introducing anything into the human body.
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Home/Sourcing & Quality

Vendor Red Flags

Warning signs catalogued across years of vendor evaluation. Any single flag is a caution; two or more is a walk-away.

Documentation flags

  • COA without a batch number — a COA that isn't tied to a specific batch is a decoration, not a document.
  • Recycled COAs — same PDF served for different products or across months. Check dates, batch fields, and file metadata.
  • Lab logos you can't verify — search the lab. If it has no website, no phone number, or the "certificate" is only ever shown as a low-res image, assume fiction.
  • No mass-spec anywhere — purity claims without identity testing are incomplete by design.

Communication flags

  • Questions about synthesis, batch traceability, or testing are deflected, ignored, or answered with marketing copy.
  • Pressure tactics: "sale ends tonight," "only 3 vials left," "act now."
  • Over-sharing: unprompted life stories, fake urgency, or guilt-tripping about "supporting small business."
  • No physical address, or an address that is a PO box / residential listing with no lab association.

Product flags

  • Pricing far below the market floor for the raw material — synthesis costs real money; a 10 mg vial at $3 was not made from $3 of peptide.
  • "99.9% pure" stamped on every product with identical wording, no batch evidence.
  • Blends and "stacks" with no per-ingredient breakdown or per-ingredient testing.
  • Vials without batch numbers, or labels that smear/peel — label quality correlates with QC culture more than you'd think.

Behavioral flags

  • Astroturfing: identical praise across forums, reviews with no purchase history, shills attacking anyone who asks hard questions.
  • Influencer affiliate codes everywhere — the person recommending the vendor is being paid per vial.
  • History of name changes, domain changes, or "new site, same great quality" relaunches after bad reviews.
  • No response — or a hostile response — when you mention independent retesting.

The one question that filters most vendors

"Can you send me the COA for this specific batch, from an independent lab, before I order?" A legitimate vendor says yes without hesitation. Everything else is noise.

See the full process in the Ultimate Sourcing Guide and the COA Guide.