Research has found that Nitric Oxide does play a role in acute stroke. The level of stroke severity and brain injury depend on the levels of Nitric Oxide taken in. An increase of Nitric Oxide is associated with an increase of brain injury and early deterioration of neurological functions. The standard amount of L-Arginine varies and is measured case-by-case. 1000mg of L-Arginine, which equals to 1g of L-Arginine, is on the low end of the dosage spectrum for L-Arginine intake. Talk to your doctor to ask how L-Arginine affects your body and the possibility of experiencing a stroke as they are more familiar with your health and can give you better guidance.