New Formula Enhancements: Added red wine extract, folic acid and Vitamin K. Increased Vitamins B12, B6 and changed sweetener to stevia. One of the primary ingredients in ProArgi-9+ is l-arginine, which was researched by three American scientists who were awarded the Nobel Prize in 1998 for discovering its powerful health benefits. ProArgi-9+ contains five essential vitamins: Vitamin C, Vitamin D3, Vitamin K, Vitamin B6 and Vitamin B12. Each plays a vital role in supporting the body’s overall performance. Vitamin C contributes to the normal functioning of the nervous and immune systems while reducing fatigue and contributing to normal psychological function. Vitamin B6 and B12 share a few health benefits with Vitamin C, but also play an important role in normal red blood cell formation and homocysteine metabolism. Vitamin K has a set of its own benefits, playing a key part in maintaining normal bones and blood coagulation.