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There is no satisfaction guarantee associated with Nutravia Gummies at this time. However, they may allow you to return damaged or unusable items if you contact them within 14 days of your delivery date. L-Citrulline & L-Arginine – This pairing of scientifically studied amino acids can contribute to significantly improved nitric oxide synthesis. L-arginine is naturally converted into nitric oxide via enzymatic reactions in the human body. L-citrulline acts as a precursor to L-arginine. When ingested orally, it can elevate internal L-arginine levels. An animal study published in Biochemical and Biophysical Research Communications reported that combined L-citrulline and L-arginine can greatly enhance nitric oxide levels and blood flow parameters, far more than either could alone. Certified Organic Ingredients: Their commitment to purity is evident with USDA Certified Organic hemp, ensuring that every gummy is free from pesticides, heavy metals, and artificial additives, making them a safe choice for health-conscious consumers.