At least 1/2 to 1 hr. Most average stomach emptying is 20min.
But it can be delayed to 1 hr in some. So 1 hr is the ideal time.
Presence of food will hinder or completely block the microgram absorption of the B12 in the intestine.(this is for people dependent on the passive form of absorption---those with good intrinsic factor may be less sensitive to this rule).
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Weezie looking at petunias 8.25.2017
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