Quaetion about L-Arginine powder

I have a nitric oxide supplement which contains L-Arginine and citrulline. This sounds strange, but I have a suspicion that the capsules I have do not contain the actual advertised ingredients because if I open them up and taste them, there is no flavor at all. I've heard the L-Arginine powder is supposed to taste terrible, so I want to know if I should even bother with these.