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I have been using a sustained release niacin for four years now since I couldn't afford Niaspan. The brand name is Enduracin from Endurance Products, INC (endur.com). Subjectivly, it feels the same as Niaspan and my labs are the same as with Niaspan. I first learned of it from Kawalski's books. I seems to be the same wax matrix as Niaspan. One interesting sidenote: Their website cites a number of independant research studies by universities, etc. that used their product. Niaspan's only published research is from their own studies that they funded and controlled. FWIW.  Best, Aaron