Promotes prolonged endurance during workouts. Supports increased blood flow for maximum pumps and muscle volume. Improved formula to maximize performance and improve recovery. Promotes thermogenesis. No stimulants, no caffeine, zero sugar, zero carbs, no proprietary blends. Informed Choice certified. No banned substances. ProSupps Dr. Jekyll Stimulant-Free is a no-compromise pre-workout that delivers maximum focus, muscle pumps, and fullness while increasing workout endurance and strength gains. WARNING: After a few days of using this product, you may notice a characteristic hardening of it. This does not indicate any change in the product. It is a natural process that occurs due to the presence of many hygroscopic ingredients, meaning that these ingredients attract water. Arginine and Beta-Alanine attract moisture. When the package is opened and the product comes into contact with moisture in the environment, the powder compacts. This is normal, and all you need to do is crush the larger pieces with a spoon. The product is recommended to be consumed within 2-4 weeks of opening the package. The longer the package remains open, the more the powder will clump.