Many athletes take caffeine in the form of pills or energy drinks to enhance performance or energy levels during training. Caffeine stimulates adrenaline release and can improve the quality of workouts. A study from the Journal of Sports Science Medicine, found that caffeine (6 mgs per kilogram of bodyweight) increased growth hormone release for at least 30 minutes after weight training session. Caffeine increases blood fatty acid levels, which triggers increases in growth hormone. Caffeine might be a useful supplement because it increases strength and training intensity, and promotes a post-exercise anabolic response.