The supplement industry is largely built on marketing science rather than evidence. However, a small number of supplements have genuine evidence for benefit in older adults.

The Problem with Supplements

Most supplements have been tested in randomized controlled trials and found to be ineffective or harmful. Beta-carotene supplements increase lung cancer risk in smokers. Vitamin E supplements increase all-cause mortality. Antioxidant supplements generally do not reduce disease risk.

The problem is that nutrients in food exist in complex matrices with synergistic effects that isolated supplements cannot replicate. Taking a single nutrient out of context often does not produce the expected benefit.

Supplements with Evidence

Vitamin D: Vitamin D deficiency is extremely common, particularly in northern latitudes. Supplementation at 2,000-4,000 IU/day has evidence for reducing cancer risk, cardiovascular risk, and all-cause mortality in deficient individuals. Blood testing is recommended.

Magnesium: Magnesium deficiency is common in the Western diet. Supplementation has evidence for reducing blood pressure, improving insulin sensitivity, and reducing cardiovascular risk. Magnesium glycinate or malate are the best-absorbed forms.

Omega-3 fatty acids: High-dose omega-3 supplementation (4g/day EPA+DHA) has evidence for reducing triglycerides and cardiovascular events in high-risk patients. Lower doses have weaker evidence.

Vitamin D deficiency affects 40% of Americans. Supplementation at 2,000-4,000 IU/day has evidence for reducing cancer risk, cardiovascular risk, and all-cause mortality.

CoQ10: Coenzyme Q10 is depleted by statin drugs. Supplementation has evidence for reducing statin-associated muscle pain and may have cardiovascular benefits.

Melatonin: Melatonin has strong evidence for improving sleep quality in older adults, who produce less melatonin than younger people.

What to Avoid

Avoid supplements marketed for immune support, energy, or anti-aging without specific evidence. Avoid high-dose antioxidant supplements (vitamin E, beta-carotene). Avoid supplements with proprietary blends that obscure ingredient quantities.

The four most evidence-based interventions for healthy aging — diet, exercise, sleep, and stress reduction — are free and more effective than any supplement.