C4 Preworkout available in Original, Sport, and Ripped. Feeling like you're low on energy or you need that pumped during your training? C4 is one of the many preworkouts we have. ONLY AT FITNESS EXPRESS! #supplements #forthegains #gymbro #preworkout | Fitness Express

Key points about pre-workout side effects: Caffeine related: Most pre-workout side effects are linked to high caffeine content, causing jitters, anxiety, rapid heart rate, and trouble sleeping. Dosage matters: Reducing the dosage of your pre-workout can often alleviate side effects. Ingredient sensitivity: Some individuals may be more sensitive to specific ingredients like beta-alanine, which can cause a tingling sensation. Dehydration risk: Creatine, often found in pre-workout, can draw water i