Longevity

NAD-related substances such as nicotinamide riboside, known under the brand name TRU NIAGEN. Polyphenols such as trans-resveratrol, quercetin and fisetin. Mitochondrial formulas with coenzyme Q10, PQQ and mitoquinol mesylate.

And antioxidants such as astaxanthin, R-alpha-lipoic acid and NAC. There are also substances here that are hard to pigeonhole, such as berberine and shilajit with fulvic acid.

Resveratrol comes from the skin of black grapes, quercetin from onions, apples and capers, fisetin from strawberries and pterostilbene from blueberries. They are substances that plants produce themselves under pressure from their environment, for example from UV light or fungal pressure.

In a supplement they are concentrated. You won't get the amount of resveratrol in one capsule from a glass of red wine, however persistent that story may be. When comparing, look at the number of milligrams per daily dose and, for a plant extract, what it is standardised to.

Look at the substance, the form and the amount per daily dose. A branded ingredient such as Novusetin for fisetin or BioPQQ for PQQ is a standardised raw material from a single manufacturer; that says something about origin and consistency, not about effect.

Start with one product at a time rather than a whole stack. This is the segment where stacking happens fastest, and anyone who starts five things at once won't know afterwards what had which effect.