Best Supplements for Men Over 40 Multivitamin. In an ideal world, a healthy and varied diet provides all the nutrients necessary for your body to function at its peak. ... Creatine. Creatine is a non-protein amino acid found in red meat and seafood. ... Selenium. ... Saw Palmetto. ... Fiber. ... Omega-3 Fatty Acids. ... Magnesium. Jan 28, 2020