How to evaluate any RUO peptide vendor.
We won't name vendors. We will tell you exactly what to check before you spend money on one. The 11-point checklist most peptide-Discord regulars run mentally before every order.
7 min#sourcing#field-guide#ruo#vendor-evaluation
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Most -buying advice online is either "just use [vendor]" — which expires the moment that vendor's QC slips — or "do your own research," which means nothing. This is the actual checklist regulars run mentally before they order.
The 11 checks
1. Third-party COA on the product page or 1-click away
Not behind a contact form. Not "DM us for ." The COA should be linked publicly per batch, and the batch number on the COA must match the vial you receive. If COAs are gated, the vendor has something to hide. Move on.
2. The COA names a real testing lab — and that lab has a web presence
Search the lab name. Real labs have addresses, ISO certifications, scientific publications. Lab names like "Premium Bio Verify" with a free Wix site are a fabrication marker.
3. The COA reports HPLC purity ≥98% with method specified
Not "≥99% by LC." The method matters — vs UV vs GC give different numbers. under 0.5 EU/mg if reported. Mass spec confirmation of expected molecular weight.
4. Independent ID-test results posted in the community within the last 6 months
Search the vendor's name in r/Peptides, r/Tirzepatide, Discord channels. Look for community-posted mass spec results — not vendor-posted ones. Real labs (Janoshik, Anabolic Lab, Jano Analytical) issue formatted reports the community recognizes.
5. Track record longer than 18 months
The -vendor space has high churn — vendors appear after a successful group buy, ride momentum for 6–12 months, then disappear when their payment processor freezes. An 18+ month operator has survived at least one processor change, which is a meaningful filter.
6. No "free shipping over $X" or "50% off Cyber Monday" loud-promo behavior
Legitimate vendors run quiet. Anything that looks like a Shopify drop-shipper running aggressive promos is a Shopify drop-shipper running aggressive promos.
7. Reasonable, not impossible, prices
$5/vial of 10mg BPC-157 is fake or short-fill. The community-known floor for honest is roughly $25–40/vial for common peptides. If the price is 5× below that, the math doesn't work without cutting something.
8. Domestic warehouse, not direct-from-China shipping
Vendors that ship from US warehouses go through customs only on the wholesale side. Vendors that drop-ship from China lose 10–20% of orders to Customs and Border Protection. If you want gray-market prices, buy raws directly (Tier 1) — don't pay a US premium for a vendor who's just a forwarder.
9. Crypto OR e-check, never "Zelle / Venmo / CashApp only."
Personal-payment-app-only vendors are operating outside any payment infrastructure that could create a paper trail. That's a chargeback-prevention play, but it's also a recourse-prevention play. Real operators take crypto + ACH + sometimes wire.
10. Ships in plain packaging without the vendor's name on the label
"Yes I take peptides" doesn't show up in delivery scan logs. Vendors who ship in branded packaging are betting your address won't be flagged. Sometimes that bet loses.
11. Email response within 48 hours from a real human
Order something tiny first ($30 sublingual or oral ). Email a question. Response time + tone tells you everything. Templated responses, no signature, off-topic answers — those are red flags. Real operators answer specifically.
What's NOT on this checklist
- "Reviews on the vendor's site." They control them.
- "Trustpilot stars." Bot-farmed.
- "BBB rating." Useless for unregulated industries.
- "Money-back guarantee." Fine print kills them.
- "My friend uses them." Your friend's variance pool is too small to predict your batch.
When all 11 check out, you still test
Even a vendor that passes all 11 checks deserves a first-order ID test before you trust them with your money. Batch-to-batch variance is the silent risk. The vendor that passed in 2024 might be cutting corners in 2026 because their old supplier got busted.
The checklist filters out the obviously bad. The catches the rest.
Related: How peptides actually get to your door · How to read a COA · How to run an ID test
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