01 / Evidence
Does the ingredient make sense?
We look for relevant human research and assess whether the product's intended use is supported by the evidence.
The Key Score
A score built for clarity.
Key Supplements reviews products by looking past marketing claims. Every score considers the evidence for the ingredient, the quality and dose of the formula, testing and label transparency, and cost per effective serving.
Our promise
Brands cannot buy a higher score or a favorable review. Our job is to make the decision clearer.
How we score products
Four factors, one practical verdict.
02 / Formula and dose
Is the formula fit for purpose?
We check the ingredient form, the dose per serving, and whether the label is clear enough to compare fairly.
03 / Testing and transparency
Can the brand back up its claims?
We give credit for meaningful third-party testing, accessible batch information, and plain-language sourcing details.
04 / Value
What does an effective serving cost?
We compare price in context. A lower sticker price is not automatically better if the dose or formula falls short.
Reading the score
Scores should be useful at a glance.
9.0–10
Excellent
Strong evidence, a well-designed formula, and clear product information.
8.0–8.9
Very good
A solid choice with a small trade-off in price, format, or transparency.
7.0–7.9
Consider
Can fit the right person, but compare the alternatives before buying.
Below 7.0
Limited value
We see a meaningful concern with evidence, dosing, transparency, or value.
Editorial standards
Independence is part of the method.
Affiliate links do not affect scores.
We may earn a commission when you buy through a link. That does not change the research, ranking, or language in a review.
Reviews are updated when the facts change.
We revisit recommendations when formulas, available testing, or pricing change, and correct material errors when we find them.
Information, not personal medical advice.
Supplements can be useful, but they are not right for everyone. Consider your health history and speak with a qualified clinician when appropriate.