I used creatine for a bit can't think if grew any more was long time ago. I've been getting good results by having long rest periods of 4 to 7 days between.

creatine is part of the atp my bird who knows shit said it's n amino acid so I imagine it's similar.

atp is used for 3-4 minutes of high intensity exercise after the potassium has burnt off.

I was thinking of trying an atp supplement.