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Can help with hard efforts lasting roughly one to four minutes, such as intervals and high-rep sets.

Beta-alanine is an amino acid that raises carnosine in the muscle, which helps buffer the acid that builds up during hard efforts.
The effect is modest and limited to efforts of roughly one to four minutes: intervals, rowing, high-rep sets. It builds up over weeks rather than working on the day.
Meat and fish carry carnosine, which the body breaks down into beta-alanine.
No. It is a known, harmless effect called paraesthesia, and it fades.
Probably not; its benefit is in efforts lasting a minute or more.
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