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c/vendorvetting·posted 2 months ago by u/fibre_forward

[Lab] split one vial across Medutest and Janoshik — 96.2% and 99.2%

Lab Receipts ×3 Cold Box ×1

Filing this under things worth writing down: split one vial across Medutest and Janoshik — 96.2% and 99.2%.

Pulling the figures out of the title: 96.2% and 99.2%. All of it is written down as it happened rather than reconstructed.

The wider-market rows in the directory carry a band and a report count and nothing else, deliberately. Anything more would be manufacturing precision that the evidence does not support.

Inter-lab variance on this assay runs a point or two either way. Two services disagreeing by that much is agreement, not a discrepancy, and treating it otherwise starts pointless arguments.

Ask me anything specific. Anything general I will probably get wrong.

2,076 up / 361 down85% upvoted54 commentsid 13b7nh24 May 2026

54 comments

14 in this archive, depth 4

best — the order this archive was captured in

u/camila_sandvik297 points·2 months ago

Independent testing is worth more than a supplied certificate for one structural reason: the chain of custody. A member who buys, ships and pays is testing the same thing you would receive.

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u/boots_or_bust240 points·2 months ago

The order I actually check things in, for anyone building a process rather than asking about one supplier.

First, the record: source page, verification log, and how many separate lots have been tested rather than how many tests exist. Second, the paperwork: ask for a batch-specific certificate and see what comes back and how fast. Third, the logistics: quoted lead time, minimum quantity, which lines are held in regional stock. Fourth, buy small and test it yourself.

Nothing in that list is exotic and all of it is answerable before you spend real money. Most of the disappointment posts on this board skipped step two.

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u/adnan_sandvik113 points·2 months ago

The order I actually check things in, for anyone building a process rather than asking about one supplier.

Would qualify this slightly. Fewer entries means less sampling, and less sampling is not the same as a worse process.

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u/nz_unfunded217 points·2 months ago

Did you ask for the batch-specific certificate, or the generic one?

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u/gustav_vermeulen174 points·2 months ago

That reads as a recommendation and the source pages deliberately are not. They are a record you use to make your own decision.

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u/solene_eriksen56 points·2 months ago

Careful. "Nobody has tested Core Peptides" is a statement about this board, not about the supplier. Say the first thing, not the second.

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u/kasper_cabrera177 points·2 months ago

Mild pushback: a supplier with fewer entries is not worse, it is less sampled. Those are different claims and the table says so.

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u/fibre_forwardOP90 points·2 months ago·edited

lead time quoted at checkout is the number to hold them to

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u/dario_petrescu107 points·2 months ago

Mild pushback: a supplier with fewer entries is not worse, it is less sampled.

kasper_cabrera is describing the batch record test and it is the fastest signal available before you spend anything.

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u/ledger_modMOD107 points·2 months ago

Removed pending evidence. Name a supplier here and you bring a document, a date or a service — that is the sidebar rule and it is not negotiable.

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u/coa_janitormod · c/coa68 points·2 months ago

Where a supplier holds regional stock, ask which lines are actually held there rather than drop-shipped. It changes the lead time and it changes the customs question.

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u/fibre_forwardOP37 points·2 months ago

Is that from the source page log or from memory?

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u/camila_sandvik54 points·2 months ago

Is that from the source page log or from memory?

This is the whole method in one sentence. Everything else in the thread is elaboration.

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u/sig_figs_sammod · analytical17 points·2 months ago

three independent results beat thirty forum posts

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About c/vendorvetting

The community due-diligence desk. Vendor experiences, independent third-party test results, shipping and reship records, and the boring paperwork that separates a supplier from a story. Every substantive claim is expected to carry a receipt: an order id, a dated screenshot, or a test report from Janoshik, Medutest, PeptideMeter or VendorInvestigate.

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Janoshik Analytical

Independent HPLC and mass spec. The number you get is the number they found.

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