5. Citrulline
Citrulline is an amino acid that brings up the levels of arginine and nitric oxide in your body. This brings up your blood flow and speeds up the delivery of nutrients to your muscles. Citrulline also boosts your energy levels by flushing out toxins like lactic acid and ammonia, meaning you can get more out of your workouts. Raising arginine levels also boosts your levels of HGH and IGF-1, two hormones that develop and repair muscles and tissue. Citrulline is great at perking you up when combined with coffee.
