You can take ingredients that will increase nitric oxide levels in the body but you can't actually take nitric oxide. It's a gas.
[FONT=arial, sans-serif]Nitric oxide supplementsdon't actually provide [/FONT][FONT=arial, sans-serif]nitric oxide, which is a gas, but generally contain L-arginine which can increase blood flow. [/FONT]
[FONT=arial, sans-serif]If you are looking for a nitric oxide supplement, try D-spark from n2mb.com as @stevesmi and @lev butlerov suggested[/FONT]