Energy then crash after niacin?

I’ve worked my way up to doses of 500mg of flushing niacin (nicotinic acid) x3 per day. After my first dose in the morning I get a nice flush, energy and clarity, but then late morning I get a large energy crash.

Has anyone else had this and if so what did you do?

I’ve tried taking it with l-glutamine (500mg) and Vit C (1000mg) and have the same reaction. I’ve just ordered some glycine and will see how that interacts.

I’m loathe to stop taking it as it’s been excellent for my reynauds so any workarounds/insight would be great.