Vitamin D, K, Fish Oil, Magnesium, Creatine, and Theanine all have lots of research on being effective, with very low risk. Next up, Curcumin (active Turmeric)

Vitamin D, K, Fish Oil, Magnesium, Creatine, and Theanine all have lots of research on being effective, with very low risk. Next up, Curcumin (active Turmeric) and Ashwagandha also have significant research concluding their benefits, but I'd say their risk is one level higher, still small. examine.com