is sublingual b12 as good as injections Vitamin vs. Oral Supplements: Which Do You Actually Need? 6 best vitamin B12 supplements
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Retrieved 2 March 2015

15 In a study that compared heme and nonheme iron absorption in patients before and after undergoing RYGB (n=20) or VSG (n=20) procedures, researchers discovered that both surgical procedures resulted in a significant decrease in absorption of each type of iron

Rapid correction of deficiency is required

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