What are you looking at? Proteins are amino acids. If you are looking at something like glutamine, some runners do well with taking it while others can have big time GI issues. My take--as long as you are eating a healthy, balanced diet, that trumps supplements (which are not regulated by the FDA for potency) any time.
I used some amino acid caps, Hammer Endurance Amino, before and after my long runs and during my last HM.
They are billed to: Decrease perception of fatigue and increase cognitive performance. Help build, maintain, and repair lean muscle mass. Powerful immune system support.
I can't say for sure if they helped me or not. I had a good training cycle and made some other nutritional changes, but I did PR by 7 min.
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