I really would look at AlphaGPC - NOW Foods has excellent capsules. A lot of AlphaGPC you see listed in energy drinks/preWO blends is only 50% potency, so “300mg” is really just 150mg. But NOW’s is full purity, and 1-2 caps of those are worth your time!
I am NOT a fighter, but Alex Kikel had gotten into that a lot and been doing PEDs for them by the end of his podcasting, and that was his assertion. Get the test up so estrogen is sufficient for joint health/collagen synthesis, rbc/crit is high normal for endurance, safest profile too. Then if you need even more pop than say 180-250 test, add a little tbol for a while. For when you don’t need more estrogen or RBC.
But you have to keep drugs low enough that it is helping, not hurting. Excess estrogen is going to cause water retention, winding, pumps, and overly thick blood will also make you tired. So those are the main limiters for actual test, and things like nandrolone.
Something like ~200 test and 20mg Tbol, or 100mg nandrolone/wk.
AlphaGPC won’t directly do anything for the physique, but it can help you lift heavier weights. Choline is probably the #1 sports supplement I recommend serious lifters after caffeine - even before creatine, which is basically all positives & helps prevent dementia & improve motor pattern learning.