Evidence Scoring Methodology

Every listing receives an evidence score from 1 to 5. The score answers one question: how strong is the human evidence that this product or service does what it claims for healthy men over 40? It is not a measure of popularity, price or whether we earn a commission.

The scale

• 5, Strong: consistent randomized trials, meta-analyses or long-standing clinical guidelines support the claim.
• 4, Good: solid validation or good observational and mechanistic evidence, with limited randomized data.
• 3, Mixed: plausible benefit with some supportive studies, or a sound measurement whose interpretation layer is unproven.
• 2, Limited: small, low-quality or conflicting studies; mostly marketing claims.
• 1, Anecdotal: little to no human evidence.

What we weigh

• Measurement validity: does the device or test measure what it says, against a reference standard?
• Clinical outcomes: do trials show a benefit that matters, not only a surrogate marker?
• Study quality: randomization, sample size, duration, independence from the seller.
• Safety and quality control: adverse event signals, third-party testing and regulatory status.
• Applicability to men over 40.

Independence

Affiliate relationships and paid listings never change a score. Featured placements are labeled and sold separately from scoring. See our affiliate disclosure.

Updates and corrections

Scores reflect the evidence at the time of review and are revisited as new studies appear. Prices are intentionally described loosely ("check site") because they change often. Spot an error? Contact us and we will correct it.

This is educational content, not medical advice. See the medical disclaimer.