For r/Peptides · r/tirzepatidecompound · r/moreplatesmoredates
Reddit's Guide to Independent Peptide Testing (2026)
Every question Reddit asks about third-party peptide testing — where to send samples, how much it costs, what a COA actually proves — answered by an independent US laboratory that does the work.
Updated July 2026 · Sun City Center, Florida · No vendor affiliation
TL;DR for Redditors
Who we are: ACS Peptide Testing Labs, an independent US lab in Florida. We test peptides shipped in by mail — no vendor relationship, no minimum order.
What you send: 5–10 mg of lyophilized powder in the vial it came in. USPS Priority is fine.
What you get: A Certificate of Analysis (PDF) showing HPLC purity, optional mass spec identity, and impurity profile. 9–11 business days.
Cost: ~$75–$150 HPLC alone, ~$150–$250 HPLC + mass spec. Same-day written quote.
Why not Janoshik: They're in Czechia. We're in Florida. Same methods, no international shipping, US-formatted COA.
The r/Peptides FAQ, Answered
Reddit: Where can I get my peptides tested in the US? (r/Peptides)
Reddit: Is Janoshik the only option for third-party peptide testing?
Reddit: How much does it cost to test a peptide?
Reddit: How do I ship peptides to a testing lab without getting flagged?
Reddit: What does 99% purity actually mean on a peptide COA?
Reddit: Which peptides do people usually get tested?
Reddit: Can I trust the COA that came with my peptide?
Reddit: What's the difference between HPLC and mass spec for peptides?
Peptides Redditors Test Most
Direct links to each peptide's testing page — HPLC method, common impurities, expected purity range.
Retatrutide testing
Purity, identity, impurity profile
Tirzepatide testing
Purity, identity, impurity profile
Semaglutide testing
Purity, identity, impurity profile
Cagrilintide testing
Purity, identity, impurity profile
BPC-157 testing
Purity, identity, impurity profile
TB-500 testing
Purity, identity, impurity profile
Tesamorelin testing
Purity, identity, impurity profile
Glow Blend (GHK-Cu / BPC / TB) testing
Purity, identity, impurity profile
NAD+ testing
Purity, identity, impurity profile
What Reddit gets wrong about third-party testing
"Vendor COAs are good enough."
The lab was picked and paid by the vendor. When we retest those samples, 73% show a measurable purity gap versus the printed number. That's not fraud — it's marketing math.
"HPLC 99% means it's real."
HPLC tells you how pure the peak is, not what the peak is. Mass spec confirms the molecular weight matches the actual peptide sequence. Both matter.
"You need a business account or a prescription to send samples."
You don't. We accept mail-in research samples from individual senders. The COA is issued to whatever name and reference ID you provide on the order form.
"Testing is only worth it for expensive peptides."
Cheap peptides are the ones most likely to be underdosed or misidentified. A $100 test on a $40 vial is often the difference between a working research program and six months of wasted data.