I would recommend arginine, the form I used was plain l-arginine, but I switched to Arginine alphaketoglutarate (AAKG). Nitroglycerin in oral spray work as well, as it is used to treat heart conditions. Also niacin (vitamin B3), but don't expect instant effects. However, if one was to make a liquid solution of all three substances... Should work faster... And if one was to make bad joke... Try convincing somebody to rail l-arginine as it would 'kick in faster' :D
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