[Explainer] evidence levels: in vitro, rodent, human. say which one you mean.
evidence levels: in vitro, rodent, human. say which one you mean — with the reasoning, because a rule without a reason gets ignored.
Sent an unusual compound to Medutest because nobody on this site had ever posted one. 99.4% against a claimed 98.5%.
The three questions to ask before ordering anything from the long tail of a catalogue.
What exactly is it — catalogue number or sequence, not a common name, because several common names map to more than one molecule. How was identity established — mass against theoretical, ideally, rather than a bare purity figure. What are the storage conditions, stated specifically, with a state and a duration attached.
Then two commercial questions that save time: is this a stocked line or made to order, and what is the lead time in writing. All five are one email, and the shape of the reply tells you a great deal before any material moves.
Storage conditions came back specific rather than generic when I asked. That told me somebody had actually done stability work.
Ask me anything specific. Anything general I will probably get wrong.
best — the order this archive was captured in
For any compound with a thin testing history, identity is the first question. Mass spectrometry against a theoretical mass answers it; an area-percent purity figure does not.
I would not treat catalogue breadth as a quality signal. It is a business decision, not an analytical one.
Confirmed the lead time in writing before ordering a made-to-order line. It was longer than the site suggested and entirely reasonable once explained.
Careful — that is a claim about efficacy and there is essentially no human evidence behind it.
Asked for identity confirmation on an unusual line and got a mass spectrum with the theoretical mass alongside. That is the answer I now look for everywhere.
Naming in this space is inconsistent. Several widely used names map to more than one molecule, so a catalogue number and a sequence beat a common name every time.
On the thin testing history in this board, and what to do about it.
Most of the compounds discussed here have a handful of independent results across the entire site, and several have none. That is a fact about how few members have paid for testing, not a judgement about the material.
What follows: buy small, test identity first for anything unusual, and post the result even when it is unremarkable. The vendor source pages are built from exactly these submissions, and the compounds with the thinnest coverage are the ones where one more entry changes the picture most. Research material is not approved for human use, so what this board can usefully build is an analytical record.
Standing reminder: research-use-only material is not approved for human use, and no outcome claims without evidence.
Bought small on anything without a testing history here. That rule has never once cost me anything.
Asked Homopeptide which lines they keep in regional stock versus make to order and got a clear split. It changed what I ordered.
ask which lines are actually stocked rather than made to order
Right — CPC answered a handling question with actual storage conditions rather than a generic line, which is the standard.
Net peptide content accounts for counterion, water and residual solvent. On some of these compounds the gap between purity and net content is substantial and entirely honest.
Agreed that thin testing here says something about the members, not about the material.
Agreed — identity first for anything off the well-travelled list. The purity number is meaningless until you know what it is pure of.
purity methods differ between compound classes
Net peptide content on the certificate was well below the purity figure and both were honest. Chemistry, not deception.
Net peptide content on the certificate was well below the purity figure and both were honest.
Agreed — and the naming problem is worse than most people here realise.
Not convinced. A purity figure without a stated method is not comparable to one that has a method attached.