I am also interested in a good brand.
Quoting from the research link given by Growing Up:
When shopping for an L-arginine nitric oxide formula, make sure the research behind the formula is valid and safe (at least ten years of research). If the company marketing an L-arginine formula cannot validate that they have had an L-arginine product publicly “on the marker” for at least five years with no FDA/FDC violations or negative health reports, look elsewhere.
The consumer should ask the manufacturer of the product to explain the metabolic pathway or methodology by which his product stimulates the production of NO or provides NO to the body. The product should also be low glycemic, as insulin-stimulation is contraindicated in an arginine formula.
Anybody know of such a brand?