If you have freezing cold legs all the time or you suffer from swollen limbs, then Citrulline from DHC is the perfect option for you. L-citrulline fuels muscle cells and supports your body's production of nitric oxide. It works with arginine to remove ammonia from the body, boosts immunity and stimulates energy production. Also, L-citrulline plays a part in the synthesis of enzymes, strengthens the skin and hair and supports the nervous system. Arginine plays an important role in removing ammonia from the body, immune function, and the absorption of nitrogen.