Independent testing: Janoshik, Medutest, PeptideMeter and VendorInvestigate compared

Started 7 March 2026 · 15 replies · 103 hearts · read 1.4k times

Ollie OPeterhead, UK · 7 March 2026

4 months ago

Starting a thread on this because it keeps coming up in ones and twos: Independent testing: Janoshik, Medutest, PeptideMeter and VendorInvestigate compared

I have read the paper and I am not sure I have understood it.

I would like to understand the limits of this properly rather than the headline, because the headline is the part everybody already knows.

The claim I keep seeing is stated with enormous confidence and I cannot find a single primary source for it anywhere.

I have a document in front of me and I can read every line of it and I still cannot tell what it proves.

Happy to be told I have misread it. That would be the most useful possible outcome of this post.

PerrinNice, FR

Nothing on this site is medical advice, nothing here is a recommendation to source anything, and the risk is real and is not ours to remove.

ShadeIbadan, NG

Something worth stating plainly: sterility and endotoxin are separate assays and a purity certificate says nothing about either.

NazneenDhaka, BD

The plain position of this circle does not change: buying outside a prescription means no pharmacist checked your dose, no regulator inspected the line, and nobody is accountable to you. We cannot remove that.

8me too 7

SunilFacilitatorBirmingham, UK

A standing request in this circle: when you bring a paper, say what the methods section actually did. It is the part everybody skips and the part that decides what the paper is worth.

SaskiaThe Hague, NL

The check I would not skip is the lot number on the vial against the lot number on the document. It takes ten seconds and it is the only check that is entirely yours.

NylaNairobi, KE

What our sourcing reference pages do is say what can and cannot be verified about a supplier. That is a narrower thing than a recommendation and it is deliberately narrow.

BramberSteyning, UK

What Nyla described happened to me too, in a slightly different order.

I asked for the certificate for my specific lot rather than a representative one, and the answer to that request tells you a great deal.

TamsinRedruth, UK

Reading this properly rather than skimming, which is all I have to offer today.

LucasSão Paulo, BR

My experience is that the well-documented end of this market has become considerably more transparent over the last few years.

6me too 1

SindriReykjavík, IS

#10

Gently disagreeing with Tamsin, or rather adding the other half of it.

What I would say to somebody new is to read the risk paragraph at the top of the reference pages properly before anything else on them.

TaviaPalermo, IT

#11

Coming back to what Tamsin wrote further up, because it is the bit I keep thinking about.

I found the questions list on the reference pages more useful than any of the prose, because it gave me something to actually do.

OsipTbilisi, GE

#12

Something worth knowing: certificates carry different things. The ones worth having name the method and the column, not just a percentage.

GittaBonn, DE

#13

My honest position is that I would rather this community discussed this openly than left the question to be answered by somebody selling.

6me too 6

SunilFacilitatorBirmingham, UK

#14

Facilitator note: the guides on reading a certificate and on what purity actually means answer most of the questions on this page and answer them better.

GwionBangor, UK

#15

The independent testing services people use here are Janoshik, Medutest, PeptideMeter and VendorInvestigate, and commissioning your own is the only result you commissioned.