Number 1: Caffeine.
Caffeine is perhaps the most widely used stimulant in the world, taken almost religiously by many sleep-deprived individuals for a quick energy boost.
But, it also has very capable ergogenic, performance enhancing effects that can aid muscle growth.
Studies consistently...
caffeine
creatine
cycle
energy
found
growth
hormone
increase
loss
muscle
muscle building
muscle gain
muscle growth
myostatin
number
performance
protein
reps
studies
supplements
test
training
whey
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