Allergies and Sensitivities to Pre-Workout Pre-workout capsules are designed to boost energy, focus, and performance during exercise, but not all ingredients are suitable for everyone. Some individuals may experience allergic reactions or sensitivities to certain compounds commonly found in these supplements. Understanding these risks is crucial for safe and effective workouts. Common pre-workout ingredients that may trigger reactions include caffeine, beta-alanine, creatine, artificial sweeteners, herbal extracts, and certain amino acids . For example, caffeine can cause jitters, rapid heartbeat, or digestive issues in sensitive individuals. Beta-alanine may lead to tingling sensations, and artificial additives can sometimes trigger allergic responses like hives or swelling. People with existing allergies or medical conditions should carefully read labels and consider consulting a healthcare professional before trying a new pre-workout. Choosing products with natural ingredients o...