High-stim formula Supports strength, muscle pump, stamina, focus, and energy Informed Choice certified Free of GMOs, gluten, and artificial colors, sweeteners, or flavors Black Cherry flavor Bulk Black from Transparent Labs is made for stim lovers. This clinically dosed pre-workout delivers extra “pep” with more than 17 grams of proven nitric oxide boosters, hard-hitting nootropics, natural testosterone-supporting ingredients, and muscle fortifiers—including l-citrulline malate, beta-alanine, betaine anhydrous, and sustained-release caffeine. Frequently Asked Questions What is nitric oxide? Nitric oxide is a vasodilator that promotes blood circulation. What are nootropics?   Nootropics are substances that bolster cognitive function by altering levels of certain neurotransmitters, enzymes, or hormones in the brain.  What is citrulline malate? Citrulline malate is a precursor to nitric oxide, which increases blood flow to working muscles and promotes greater muscle pumps and heightened energy levels. What is beta-alanine?   Beta-alanine is the modified version of the amino acid alanine. The body converts beta-alanine into carnosine, which supports exercise performance and endurance.  What is betaine?   Betaine is a naturally occurring amino acid-like compound that supports exercise performance and endurance.