Keep on top of your goals with Arginine and Ornithine - an easy-to-take capsule form of these two popular amino acids for strength-focused athletes. Arginine is a precursor to nitric oxide whilst ornithine is broken down to arginine in the body. Each capsule is packed with 500mg of L-arginine and 250mg of L ornithine HCL - take any time during the day. Keep on top of your goals with Arginine and Ornithine - an easy-to-take capsule form of these two popular amino acids for strength-focused athletes. Arginine is a precursor to nitric oxide whilst ornithine is broken down to arginine in the body. Each capsule is packed with 500mg of L-arginine and 250mg of L ornithine HCL - take any time during the day. Popular with strength-focused athletes. 500mg of L-arginine per capsule. 250mg of L-ornithine per capsule. 100 capsules per pack L-Arginine and L-Ornithine, from Swanson Health, is a popular food supplement amongst athletes. Read more.