The CarnoSyn® brand features two ingredients: CarnoSyn® instant release beta-alanine and SR CarnoSyn® sustained release beta-alanine. Both ingredients deliver the same benefits for athletic performance: increased strength, enhanced endurance, faster recovery, and greater focus. Sustained release SR CarnoSyn® is an advanced delivery form of CarnoSyn®, which delivers higher dosing levels of beta-alanine. SR CarnoSyn® results in a sustained release beta-alanine that stays in the body longer for carnosine synthesis. The net effect is higher muscle retention of carnosine, facilitating better, faster, muscle-building results.