Niacin is a water-soluble B vitamin – vitamin B3 - and the common name for 2 very different compounds: "nicotinic acid" and "niacinamide". High doses of niacin (as nicotinic acid) can lower cholesterol levels (although the exact mechanism of action is still not known). The other form of niacin (nicotinamide or niacinamide) does not open blood vessels wider nor provide a cholesterol-lowering effect
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The issue however is ability to detox and your Liver.
Hubbart knew about Lyme and Niacin is a great tool to keep the body free but if you already got it taking his dose will kill your liver.
IMO best practice is to start with Niacinamide then add some Inositol Hexanicotinate and see how it goes.
If all is well use the link above to increase dosage...