PR or ER comes with 300mg of caffeine paired with 300mg of L-Theanine to keep you focused and energized through your workout. It has 3.6g of Beta-Alanine to prevent muscle fatigue, A mix of 4g of L-Citrulline, 2g of Hydromax Glycerol, and a clinical dose of 50mg of S7 Blend for the pump. And to top it all off it comes with 1g of L-Tyrosine for increased performance, and 25mg of AstraGin for increased absorbtion.