Caffeine is a psychoactive drug. Your brain has receptors where caffeine molecules can fit (they’re supposed to be for the amino acid adenosine, but caffeine fits in there too, keeping you awake). So you create more and more receptors which means it takes more to get the same effect. That’s the short of tolerance. Protein powder is food which gets broken down by enzymes in your digestive tract. It never makes it to your brain/rest of your body in its original form the way a drug does.
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