Brand: GNC Features: COMPREHENSIVE MEN’S SPORT MULTIVITAMIN: GNC Mega Men Sport Multivitamin provides key nutrients for men’s health, performance, muscle function and immune health, plus antioxidants. CLINICALLY STUDIED MULTIVITAMIN BLEND: Contains a clinically studied multivitamin blend for men shown to work better than a basic multivitamin.^ PACKED WITH KEY NUTRIENTS: GNC Mega Men Sport Multivitamin contains beta-alanine, which is a precursor to carnosine—a key muscle function and performance factor. It also provides branched chain amino acids (BCAA) and antioxidants, which help fight free radicals that can be produced during intense exercise. BACKED BY SCIENCE: Since 1935, GNC has been committed to meeting the highest standards of quality, safety and efficacy while applying the most up-to-date advances in nutritional science so you can live well. Performance Features beta-alanine, a high-efficiency muscle pH buffer, and carnitine, which helps use fatty acids as energy.* Part Number: 048107158552 Details: Clinically Studied Multivitamin - Performance - Supports Muscle Function - Contains Antioxidants With Over 30 Clinically Studied Ingredients In Every Formula And More Antioxidant Power Than Ever Are In Smaller, Easier To Swallow Pills. Men's Health Contains A Clinically Studied Men's Multivitamin Shown To Work Better Than A Basic Multivitamin. Helps Support Colon And Prostate Health. Performance Features Beta-Alanine, A High-Efficiency Muscle Ph Buffer, And Carnitine, Which Helps Use Fatty Acids As Energy. Muscle Function Features Branched Chain Amino Acids To Fuel Muscles. Also Supports Muscles By Providing Essential Electrolytes That May Be Lost During Intense Exercise, Including Calcium, Which Plays A Role In Mediating Muscle Contraction. Antioxidants Packed With Antioxidants To Help Fight Free Radicals That Can Be Produced During Your Workout. ^In a randomized, double blind, placebo-controlled study of 112 healthy volunteers