How we score
We score every longevity supplement on the same five-point rubric, then name the trade-offs plainly — including when a competitor is the stronger pick.
| What we weigh | Weight | Why it matters |
|---|---|---|
| Ingredients & form | 30% | The actives that are well studied for healthy aging, and whether the form is bioavailable. |
| Dose per serving | 25% | The amount of each active per serving, checked against the label — not just the ingredient list. |
| Third-party testing | 20% | Independent third-party testing, COAs, and NASC membership that verify what is actually on the label. |
| Value | 15% | Cost per effective serving, not just the sticker price. |
| Fit & availability | 10% | How well the product suits a senior dog and use case, and whether you can actually buy it. |
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.