Assayer
What's actually in your supplements.
Look up any supplement and see what a laboratory measured — next to what the label promised, and next to the document the number came from. Assayer aggregates testing that already exists. It does not test, and it does not guess.
8,122 products · 11,223 measurements · free, and no brand pays to be listed
What it does
- Look up a product by what is in your cupboard and see what a laboratory actually measured.
- Every figure sits next to the label claim, with the source document attached and the funder of the test named.
- Brands get a right of reply, and the absence of any published testing is itself recorded.
Measured against the label
The tested value beside the claim on the tub.
Funding in plain sight
Who paid for the test, stated up front.
The receipt is attached
The source document, not a summary of it.
Right of reply
Brands can respond on the record.
Why it exists
Did anyone actually check what is in it? For most supplements the honest answer is no — and "most brands publish nothing" is a finding, not a gap in the data. Assayer is deliberately narrow about this: aggregating published results is verifiable, whereas running its own tests or inferring quality would not be.
Who it's for
- People checking what they are already taking
- Buyers comparing brands before committing
- Anyone in the Benelux who wants the report, not the marketing