Great if it worked for you that is fine. You should then write about it that way and say it is from your personal experience.
That is anecdotal evidence though and should be stated to be as such. You are making factual statements which people may take as medical advice and that is potentially dangerous.
There is no barrier or resistance to this information. The problem is that it does not meet the standards of scientific enquiry.
I suspect there may well be people doing real research on niacin right now and we may well find out about it in the future. Then again it may not work and sadly that kind of information i.e. negative results rarely makes headlines.
It is not some kind of conspiracy.