How do Janoshik and Medutest compare on the same survodutide batch?

Details up front: Janoshik · Medutest · survodutide.

Both of these get recommended confidently by different people, which suggests neither is obviously right.

My constraints are cost, measurement resolution and how much handling I am prepared to do — in roughly that order.

Is there a defensible reason to prefer one, or is this a coin flip?

It helps to be literal here: a submitted sample must be unopened or the date of opening must be stated, because Janoshik cannot otherwise know whether they are testing aged material.

The database can be searched by vendor, by compound, by date range and by result value, making it easy to benchmark a new supplier against historical data.

The part that matters: content assay uses a certified reference standard and quantifies against that standard under the same method conditions as the purity analysis.

Janoshik publishes summary statistics on their website, including the number of samples tested and the range of reported values, giving you a baseline for comparison.

Keep Janoshik results to compare across suppliers and across time.

To be exact about it, the single strongest value proposition of Janoshik is that they publish all results in a database indexed by vendor and compound, which lets you compare your result to hundreds of other users.

The cost of testing is by sample submitted, not by parameter measured, so a single Janoshik result gives you purity, content and identity for less than most suppliers charge for purity alone.

It helps to be literal here: comparison across time on the same vendor's material — three lots of vendor X spread over six months — shows whether quality is trending or stable.

The database has been publicly available for long enough that systematic biases in their reporting would be apparent and would have been flagged by users.

The practical summary: submit your first lot to Janoshik and check the database for that vendor.

edited 28 Jul 2026 by s_kalniete — tightened the wording; no substantive change

The database is accessible and queryable, and browsing your vendor there tells you whether other people are getting similar results to your supplier's certificate.

Janoshik reports include the lot number of the reference standard used, which lets you understand the traceability of the quantitation.

I would use Janoshik for the first lot from a new supplier and occasionally for spot-checking, not for every lot.

If you only pay for one test, pay for quantified content. Purity is the number everyone quotes and content is the number that changes what you do.

Turnaround from sample submission to report is usually two to three weeks, which makes Janoshik practical for supplier qualification but not for lot-by-lot QC.

Results are typically released within three weeks of submission, with standard turnaround unless expedited options are requested.

The ICH Q3A and Q3B thresholds for reporting, identification and qualification of impurities are the framework the pharmaceutical industry works to, and they are worth reading even though nothing in the research-grade supply chain is obliged to meet them, because they tell you which numbers a competent analyst would consider worth reporting at all.

In practice: ask for the chromatogram, check the method section, check the lot number against the vial, and set your accept threshold before you see the result rather than after.