And runners and other endurance athletes shouldn't forget that not a single scientific study has linked DHEA supplementation with improved recovery from workouts or upgraded performances in any athletic pursuit. Under the supervision of a doctor, DHEA supplements might be beneficial for individuals over the age of 50 (about 50 mg of DHEA per day are enough to raise blood quantities of DHEA to youthful levels), but scientific research has yet to identify its benefits for younger people or athletes.