Niacin : 500mg will give most folks a flush if they haven't been taking niacin.
Answered 5/19/2013
5.1k views
Any amount.: Any amount can cause flushing. Start with just 500mg at night, and increase dose by 500mg weekly, morning and night, to try to minimize experience of flushing and increase tolerance of the agent.
Answered 2/26/2015
3.2k views
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