I think that's because a lot of these Senior Congressmen use DHEA for anti-aging purposes.
I'm just amazed at how available in this country something like DHEA is. I was at the vitamin section of a whole foods store the other day & there must have been 6 or 7 different brands of DHEA all with different milligram strength. And the cost of some of these brands was fairly cheap!
It was crazy seeing such availability of a banned substance by WADA. 🤯
Number one would be creatine. Then caffeine and iron.
For distance runners?
I always thought that was for weight lifters.
For distances 1500 and up i suspect creatine would be a little to no use. As for those who are recommending, magnesium, there is very little scientific evidence to show that it does much of any. While it is critical and muscle contractions, the doses that you are taking are unlikely to get into the muscle and actively improve muscle contraction for relaxation in any meaningful way.
Sodium bicarbonate and beta alanine both have strong scientific foundations to support their use in distance running. There is some evidence for beetroot juice, also known as dietary nitrate, however much of the research has moved to more speed/power based events for use as opposed to endurance events, as it may also influence muscle contraction. Caffeine is a no brainer I’m probably has the most data supporting it’s use across all the events.
The newer supplements like Urolithins and MOT-C need more research to show a positive effect on performance.