PSI is a stimulant-free pre-workout made by EHPLabs. It was formulated to boost physical performance, boost energy and enhance vasodilation without the use of caffeine or other stimulants.
The product’s full name is PSI Vasodilator Nutrient Delivery Maximizer.
PSI contains six ingredients (5.2g in total). Citrulline malate is a blend of L-citrulline (an amino acid) and malic acid (an organic compound). It is said to reduce muscle soreness, boost vasodilation and enhance muscle pumps.
L-arginine alpha-ketoglutarate and agmatine sulfate are also thought to intensify muscle pumps, while taurine could increase hydration.
Each 300g tub of EHPLabs PSI holds 40 servings (scoops).