Exactly which B's? Niacin, B3 (but not niacinamide form) causes flushing/vasodilation.
The others are less likely. But high dose B6 over 100mg a day may cause some neuropathic symptoms in some people.
B6 also facilitates serotonin manufacture and serotonin has a flushing capacity when present in large amounts... SSRI drugs can do the same.
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Weezie looking at petunias 8.25.2017
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