B_Jim,
Trying to be as flexible as possible, although I agree with you, IF there is a niacin deficiency, one would have to identify the
cause of the deficiency.
There may be a B3 deficiency or a B3 dependancy. The former impies that we are low in B3, the latter implies that we don't use the B3 that we have in an efficient way or need more than most.
There are many reasons that this could happen.
Of course my favorite is that, as a result of very high histamine demand, our B3 is heavily consumed. This leads to a deficiency which doesn't leave any important material for construction of neurotransmitters that the brain needs. (dopamine, serotonine etc.).
I feel as though that's why it works when taken prior to orgasm. If we take it prior, we build a good store of B3 for the heavy histamine production to follow. As such, there still remains a good supply for other production required in the chain that follows.
If we take it after, it;s too late. The principal orgasmic chain tries to do it's thing whith what is available, and falls short. Taking it later does little as the production phases of the chain have passed. This might also explain why a subsequent orgasm after taking more B3 has significant effect in recuperation.
It's like feeding the beast when it's hungry. Once it's sick, it doesn't want to eat!!