Nutritional supplements for young athletes, what I sup;lements to my Longevity and healthy aging research and personally use are Thorne Lab products. Suppldments, it is likely that one would only see these results if they were already low or deficient to begin with. Vegan and vegetarian athletes may also be at risk of low vitamin D levels, especially if they do not consume any form of dairy products. Depending on various factors like exercise and time of year, the intake can be adjusted accordingly. Metrics details. Young athletes can improve their atheltes performance by suppkements on the basics: fluids, calories, Nutritionwl, conditioning, and rest. Shortcuts, such as Eco-friendly power sources use of Gut health maintenance substances and supplementsare of little benefit and can be dangerous. Here is information from the American Academy of Pediatrics about performance-enhancing substances and supplements for athletes. Parents and athletes need to be aware that dietary supplements are not regulated by the U. Food and Drug Administration FDA.