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Catuaba Bark Extract: From a tree that grows wildly in Brazilian jungles, catuaba bark has traditionally been utilized to elevate men’s sexual capacity. The tree contains bioactive compounds called catuabines that may stimulate the central nervous system, potentially leading to increased sexual desire. 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. VigRX Plus comprises ten botanically based virility promoters and a naturally sourced bioavailability enhancer. The design is so good that it’s endorsed by Dr. Steven Lamm, the Director of NYU’s Center for Men’s Health.