Performance Enhancing Drugs for Glider Pilots

While browsing all the various international racing rules to get ideas
for our upcoming soaring camp, I came across the FAI's 39-page
treatise on performance enhancing drugs, including the testing
criteria.

As an old geezer who doesn't fly cross-country nearly as fast as I
could (some call me Captain Slow), I was captivated by the idea that
there are drugs that can enhance the performance of a glider pilot.
Obviously a sufficiently severe problem that needs 39 pages of rule-
making!

What are they and where can I get them?

Obviously not alcohol - ruins your reaction time and you fly like
cr@p, but you don't know it.
Not marijuana either - also ruins your reaction time - except you know
it, but don't care.

Perhaps chewing coca leaves to improve oxygen uptake at high
altitudes? (Oxygen is cheaper)

I can't really think of any - so what is this severe problem that
needs the 39 pages of rules?

Mike