Lab ranges vary from lab to lab.
You should direct this question to your doctor.
It is rare for people in US to have low niacin... this causes pellegra which is not common in US anymore. (but more so in developing countries.)
This is an interesting and informative monograph on niacin.
http://lpi.oregonstate.edu/infocenter/vitamins/niacin/
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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