Beta-Alanine Compressed are high-quality purified gelatin capsules that are easily digestible and contain exact portions of active ingredients, namely the amino acids Beta-alanine and L-histidine. L-histidine is an essential amino acid that works very effectively together with beta-alanine, the main active substance in the body. With sufficient amounts of both amino acids, carnosine is created in the body. This dipeptide causes paresthesia (tingling) and is sought after by athletes along with vitamins B5 and B6 to reduce fatigue and exhaustion and improve energy metabolism.