Janoshik Analytical, an independent third-party testing laboratory widely used by this community for HPLC purity, identity and quantified content work. Use this tag for questions about submitting samples, turnaround, method detail and interpreting their reports.
Conditions: PeptideMeter · VendorInvestigate · retatrutide. I would like the axes of comparison first and the recommendation second. I have tried the first option and…
Setup, so nobody has to ask: Janoshik · Medutest · ecnoglutide. Both of these get recommended confidently by different people, which suggests neither is obviously…
What I have: an HPLC purity test · orforglipron. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me…
I split one vial and sent halves to two independent laboratories. Purity came back 98.1% and 99.4%. Both sent chromatograms. Both look competent. The 1.3-point gap is…
The case in front of me: PeptideMeter · VendorInvestigate · dulaglutide. These are treated as interchangeable and I do not think they are. If both are acceptable I…
Numbers first: a sterility test · dulaglutide. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
A vendor sent me a report showing a clean deconvolved mass at 4113.6 for semaglutide with, in their words, "no impurity peaks detected". Their sales copy turns that…
The case in front of me: a Karl Fischer water content test · oral semaglutide. I want to decide this in advance so that I am not deciding it under pressure later.…
For reference: VendorInvestigate · PeptideMeter · a GLP-1 receptor agonist. I am trying to choose between two options that are usually discussed as though only one…
For reference: VendorInvestigate · PeptideMeter · cagrilintide. I am trying to choose between two options that are usually discussed as though only one exists. I am…
I am about to pay for quantification on a group of vials rather than just purity, having read enough here to understand why. Before I do, I want to know what I am…
Stated plainly: an endotoxin test · mazdutide. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not tight, and my…
Stated plainly: Janoshik · Medutest · semaglutide. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I can obtain…
Details up front: a sterility test · retatrutide. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
Numbers first: Medutest · Janoshik · tirzepatide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…
Stated plainly: Janoshik · Medutest · survodutide. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
Conditions: PeptideMeter · VendorInvestigate · orforglipron. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…
Setup, so nobody has to ask: an endotoxin test · cagrilintide. I would like to set this up properly once, rather than adjust it repeatedly. My budget is real but not…
Numbers first: an HPLC purity test · retatrutide. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if someone can tell me…
For reference: peptide mapping · semaglutide. I would like to define my thresholds before I have a result, for obvious reasons. I want a plan with explicit stopping…
Details up front: Medutest · Janoshik · oral semaglutide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…
For reference: identity confirmation by mass spectrometry · survodutide. I am at the decision point and I would rather think it through than improvise. I would rather…
I am comparing a supplier certificate against an independent result on the same lot. The failure mode I am trying to avoid is making this decision emotionally. I have…
Numbers first: a sterility test · orforglipron. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.
Submit a sampleFounded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.
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