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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. EXTENZE RED VS BLUE Episode 20 may play a role in balancing testosterone levels, although research is in the preliminary stages. Testosterone is critical not just for sexual function but also for overall mood and energy levels. By potentially regulating hormone levels, EXTENZE RED VS BLUE Episode 20 gummies might help maintain a healthy sexual appetite and overall vitality. 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.