Mouse studies are cheap. Human studies are what matter. If you're spending money on supplements for healthy ageing, you want compounds that have been tested in actual people. Here are seven with human trial data worth knowing about — plus what they do not do.
NHS guidance already recommends vitamin D for UK adults in autumn and winter. Human trials link low vitamin D status to bone loss, falls risk and immune function in older adults. Adding K2 is less well studied, but the rationale — directing calcium to bone instead of soft tissues — has some human support. Read the full vitamin D3+K2 evidence review.
Omega-3 fish oil is the most studied longevity-adjacent supplement in humans. Large trials (REDUCE-IT, VITAL) show modest cardiovascular benefits, especially for triglyceride reduction and arrhythmia risk in people with low baseline intake. It is not a fountain of youth, but the cardiac data is real.
Older adults are often magnesium deficient. Human trials show magnesium glycinate improves sleep quality, muscle cramps and anxiety scores better than cheaper oxide forms. It also supports vitamin D metabolism. See the UK buyer's guide.
Creatine is not just for gym bros. Human trials in older adults show benefits for muscle strength, lean mass and even some cognitive tasks in vegetarians or people with low creatine intake. It is one of the cheapest, safest evidence-based supplements for ageing muscle.
Randomised human trials show modest but consistent improvements in skin elasticity, hydration and joint discomfort after 8–12 weeks of collagen peptide supplementation. Marine and bovine collagen both have data. It will not reverse wrinkles, but the skin/joint evidence is real.
CoQ10 has decades of human safety data and trials showing modest benefits for statin-related muscle symptoms and heart failure markers. It is not anti-ageing in a broad sense, but for heart-energy support the evidence is reasonable.
A 2023 Science paper linked declining taurine levels to ageing in multiple species, but human longevity data is still early. Short-term human trials show benefits for blood pressure, glucose control and exercise recovery. It is promising, not proven, but the safety profile is excellent.
Affiliate disclosure | Editorial policy | Not medical advice. Consult a healthcare professional before starting supplements.