How we score
We score every longevity ingredient and product on the same evidence-first rubric, then lead with the verdict and the trade-offs.
| What we weigh | Weight | Why it matters |
|---|---|---|
| Evidence quality | 30% | The strength of the clinical and mechanistic research behind an ingredient for healthy aging. |
| Dose & bioavailability | 25% | The amount of each active per serving in a bioavailable form, checked against the label and independent third-party testing where available. |
| Safety & tolerability | 20% | The safety record at label doses for everyday senior-dog use. |
| Value & availability | 15% | Cost per effective serving. |
| Formulation & form | 10% | Whether actives are combined and delivered in a sensible, palatable form. |
We cover the whole category and let a competitor win where it genuinely earns it — believable losses are what make our wins worth trusting.
This site is for general education and is not veterinary advice. Supplements support normal structure and function; they are not intended to diagnose, treat, cure, or prevent any disease.