Nature's Life - L-Arginine 500 mg - 100 Capsules Nature's Life L-Arginine is formulated with the crystalline free-form L-Arginine, an amino acid produced naturally by a microbiological fermentation process. This amino acid is intended to provide nutritive support for cardiovascular health. Take one capsule up to three times daily on an empty stomach. L-Arginine 500 mg. Features: Crystalline free-form Supports cardiovascular health 500 mg. L-Arginine per serving GMP