A 2011 study showed that zinc supplementation had a positive hormonal benefit following exercise. The researchers broke participants into four groups. Those who took a zinc supplement had HIGHER SERUM TESTOSTERONE LEVELS following exercise than those who didn't. This is critical for muscle growth and recovery. The benefits of zinc supplementation go beyond testosterone. Zinc has been linked to IMPROVED IMMUNE FUNCTION, and as an ANTIOXIDANT and ANTI-INFLAMMATORY, all of which can benefit hard-training athletes.