A supplement label is designed to look trustworthy. This grades whether it actually is. Answer six quick questions off the Supplement Facts panel and product page, and get a transparency score, the specific green flags and red flags, and what they mean — before you pay.
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0/100
This is a label-transparency score — it grades what the label reveals, not the product overall. Our full 100-point reviews also weigh testing depth, product experience and brand record, which no label can show. Use this as a fast filter, then read the review where we’ve done one.
What a transparent label looks like
The best supplement labels share a trait the worst ones avoid: they let you check their work. Every active ingredient carries a stated amount, so you can judge the dose. Testing is tied to a named program you can look up, not a vague “third-party tested” badge. Nothing hides inside a proprietary blend, and the marketing doesn’t reach past what the evidence supports. None of that guarantees the product is great — but a label that discloses is a label you can hold accountable, and that’s where trust starts.
This decoder scores those checkable signals and calls the red flags by name. The weightings mirror how we review: ingredient-amount disclosure and real third-party testing count most, dose and added sugar next, then manufacturing and pricing clarity — with a penalty for unsupported hype. It’s the same lens as our published methodology, narrowed to what you can verify from a label in a minute.
Frequently asked questions
How can I tell if a supplement label is trustworthy?
Check whether it discloses an amount for every active ingredient, names a real third-party certification, doses the key ingredient in the studied range, and avoids unsupported claims. This tool scores exactly those factors.
What’s a proprietary blend, and why is it a red flag?
It lists several ingredients under one combined weight without saying how much of each is inside — so you can’t tell if anything is dosed effectively. It’s one of the biggest transparency red flags on a label.
Does a high score mean the supplement is good?
It means the label is transparent, which is necessary but not sufficient. Our full 100-point reviews also weigh testing depth, experience and brand record that a label can’t show. Treat this as a fast transparency check, not a final verdict.
Is it free and private?
Yes — free, no login, and everything runs in your browser. Nothing you select is stored or sent.
