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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. L-Arginine: Highly concentrated in red meat, chicken, fish, and some dairy products, L-arginine is an amino acid that acts as a vasodilator. It can help blood vessels to relax and allow more blood to pass through. A 2019 clinical review concluded studies indicate L-arginine can benefit erectile wellness in men dealing with mild erectile difficulties. After examining numerous erectile support formulas, we determined that there are a few potent formulas that may offer tremendous erectile wellness benefits. We’re calling these select few – the best gummies for ED (Erectile Difficulties).