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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. Most Nutravia Gummies user reviews we came across sounded similar to these. Most guys seem to be enjoying a better sex life while using this supplement. VigRX Plus has had longstanding success. Over the years, it’s earned a loyal support base that continues using this excellent product to derive top-notch erectile support.