Spring Valley L-Arginine provides you with an excellent quality source of this amino acid, and contributes to overall health and wellness.* L-Arginine is an important amino acid - and amino acids are the building blocks of protein.* L-Arginine stimulates the production of nitric oxide and when taken before a workout, can help support the effects of exercise. Supplement your healthy lifestyle with Spring Valley L-Arginine Amino Acid. Spring Valley understands living a healthy, balanced lifestyle is the key to being your best self. With an affordable range of products inspired by nature, Spring Valley supports your and your family's health and holistic wellbeing.