In the human body, increases in circulation naturally bring greater amounts of nutrients (fuel) and oxygen to working muscles, while also providing greater waste disposal, including the lactic acid removal (you know, the burning pain we all get when he hit the gym, run or ride).
The combined effects of greater circulation lead to vast improvements in muscle strength and power while reducing muscle soreness. This results in us being able to train harder, perform better while reducing the muscle soreness that halts our training in its tracks. There is an amino acid that resides within our blood vesicles which allow the wall of the blood vessels to relax and thus increases the circulation. This amazing amino acid is Citrulline.
Citrulline can bypass digestion and first-pass metabolism to get into our peripheral tissues. When required it can convert to arginine and then Nitric Oxide to dilate blood vessels. Arginine is less effective in your periphery doing most of its vasodilation in your gut and liver. Citrulline is the preferred form for your blood vessels into your muscle and extremities.