We have heard from researchers who believed they had ordered from us, only to find they had bought from a different site using similar branding. Counterfeit and mislabelled material is a real risk in this market, and it undermines both research data and trust. This note is for laboratory research buyers.
Why it matters
Mislabelled, impure or under-dosed material can confound experiments in ways that are difficult to detect after the fact. If the starting material is not what the label says, every downstream result is in question. Purity and verified identity are foundational to reproducible work, which is why sourcing is part of good experimental practice, not an afterthought.
Red flags to watch for
- Prices that are dramatically below the market — quality synthesis and testing cost money.
- No certificate of analysis available, or a vague one with no HPLC or mass-spec data.
- An anonymous seller with no registered company, address or support channel.
- Listings on marketplaces or messaging apps using a known brand's name.
Checks before you buy
- Confirm the exact domain — look-alike sites with similar names and branding are common. Check you are on the correct address before ordering.
- Ask for a certificate of analysis — a reputable supplier can provide a batch COA with HPLC purity and mass-spectrometry identity.
- Look for a traceable business — a registered company with a real address and a support channel, not an anonymous listing.
- Be wary of unrealistic claims — if it looks too good to be true, it often is.
How to read a COA
A useful certificate of analysis states the purity (typically by reverse-phase HPLC, e.g. greater than 99%) and confirms identity (typically by mass spectrometry, matching the expected molecular weight). Together these tell you the vial contains what it should, at the stated purity. A COA with neither figure offers little assurance.
What to do if you are unsure
If something does not add up — a mismatched domain, a missing COA, an implausible price — pause and verify before ordering. PurePeptides supplies research-grade material at greater than 99% purity, with COAs available on request. Browse the catalogue or contact us with any questions.
Frequently asked questions
Confirm you are on the correct supplier domain, ask for a batch certificate of analysis (HPLC purity and mass-spec identity), and buy from a traceable registered business rather than an anonymous listing.
Purity (typically by HPLC) and identity (typically by mass spectrometry, matching the expected molecular weight). A COA with neither offers little assurance.
A COA is available on request for the current batch; material is supplied at greater than 99% purity.
Research-grade peptides
Greater than 99% purity, lyophilised powder, same-day dispatch before 3PM with tracked UK & EU delivery. Research use only.
Shop Research Peptides →Disclaimer: All products supplied by PurePeptides are strictly for laboratory research use only. They are not for human or animal consumption and are not medical products. This article is informational and is not medical, clinical, or dosing advice.