ProSupps HYDE Nightmare Black N’ Blueberry is a pre-workout supplement designed to provide intense energy, focus, and performance enhancement for high-performance athletes. It contains 300mg of caffeine, as well as other clinically researched ingredients like beta-alanine, citrulline, and pink Himalayan salt. The product is tested for banned substances and registered with the Informed Choice program. Customers report that HYDE Nightmare delivers a powerful energy boost and helps them push through tough workouts. However, some users have experienced tingling or itchiness from the beta-alanine. Overall, HYDE Nightmare appears to be an effective pre-workout supplement for athletes looking to enhance their performance and endurance.