Arginine should only be taken before workouts.


Most people take arginine before workouts because it increases nitric-oxide levels, which helps dilate blood vessels to deliver a greater quantity of crucial substances for growth to your muscles, boosts levels of growth hormone and encourages greater fat burning during and after workouts.

But arginine should also be taken after workouts to keep growth-hormone levels high and to continue to drive nutrients to your muscles — after all, they need those nutrients to recover from an intense weight thrashing. In addition, taking arginine in the morning and before bed helps keep NO levels elevated for around-the-clock delivery of nutrients and maximizes GH levels to keep your muscles growing nonstop.