This product is made in the UK to pharmaceutical GMP standards and each tablet provides a full 1000mg of L-Arginine HCl. Provides a full 1000mg of L-Arginine HCl per tablet. L-Arginine HCl 1000mg. The body uses arginine to make nitric oxide (NO), the vasodilator effect of NO is an important factor in maintenance of healthy blood flow around the body.