Mary
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I am not sure if I tolerate niacinamide but if it is the one that releases histamine and causes flushing then it would not be good for me.
Niacinamide does NOT cause flushing - plain niacin is the one that causes flushing.
The following article states that although niacin does cause histamine to be released, it actually lowers histamine levels. However, I understand that just releasing histamine could be dangerous for you. The article does talk about niacinamide (nicotinamide), however, perhaps lowering the "histaminergic" response. You might want to check it out: http://orthomolecular.org/library/jom/2002/pdf/2002-v17n01-p017.pdf
It states in part:
Using niacin to treat histadelia might seem contradictory considering it will augment the release of histamine from basophils and tissue mast cells. However, there is evidence that the niacin flush is mediated by the release of prostaglandin D2 (PGD2) from dermal macrophages and not from degranulation of basophil and tissue mast cells.12,13 Further, Hoffer suggested that daily intake of niacin gradually lowers total body histamine by chronically depleting storage levels. Niacin has a complicated mechanism of action that modulateshistamine release, lowers total blood histamine, and increases the production of PGD2.
The amide form of vitamin B3 (nicotinamide or niacinamide) does not directly promote the degranulation of histamine containing cells, deplete tissue stores, or increase PGD2 release. Nicotinamide might function primarily by reducing the histaminergic response to antigenic stimulation.
Just a little light reading!