- This is an interesting product whose main compound is the patented nutrient and potent amino acid L-Citrulline. Citrulline, like Arginine helps increase the production of Nitric Oxide, which in turn helps boost erections. The Citrulline in Stimulin comes from watermelons. The product has clinical studies behind it to support its claims. It is not as nearly as effective as either Arginine or butea superba, but I think it definitely has a role to play in improving erectile function in some men by facilitating smoother blood flow. Put out by the company Naturally Vitamins, one of the health-food industries "good guys" and maker of Wobenzym, the leading systemic enzyme formula in the country. You won't find any bogus claims made by this company, just a good product that might do the trick for you.
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