Here is a follow up what Daizymae just wrote about niacin.
I am using the flush niacin and the inositol hexanicotinate, which Newport has mentioned and also is mentioned in the FAQ by Frea. ( on the VWT Iodine supplementation forum).
This (above) I posted originally on the VWT forum.
I have switched to the inositol hexanicotinate it is a fush niacin but released slowly, not the same as no-flush niacin. It is much easier to up the amount.
The cheapest brand I found was 21st Century less than $6 for 100 capsules. I either bought it at Amazon or iHerb.
Make sure you read the link above for information.