why do some pre workouts make you itch

Pre-workout supplements often cause a tingling or itching sensation, primarily due to an ingredient called beta-alanine. Beta-alanine is an amino acid that helps enhance athletic performance by buffering acid in muscles, which can allow for prolonged endurance during intense workouts. When consumed in higher doses, beta-alanine can activate nerve receptors in the skin, producing a sensation known as paresthesia, which manifests as itching or tingling, typically on the face, neck, and hands. While it may be uncomfortable for some, this side effect is generally harmless and tends to subside over time as your body becomes acclimated to the supplement.