I'm looking at my question about homocysteine metabolism and am doing a followup inquiry into vitamins B6(Pyroxidine) and B12(Cyanocobalamin). I've found this interesting bit about vitamin B12 and am looking at its implications:
Approximately 56% of a 1 mcg oral dose of vitamin B12 is absorbed, but absorption decreases drastically when the capacity of intrinsic factor is exceeded (at 1–2 mcg of vitamin B12)
I'm trying to understand the implications of an intrinsic factor involved in B12 absorption. Lets say that a person gets vitamin B12 from both food and a single supplement pill. Will taking that pill "use up" the absorption factor and prevent food's vitamin B12 from being absorbed over time?
This is the first time I'm hearing of additional "factors" that may limit vitamin absorption in the human body. Is this common across vitamins, or is it B12 specific?
Thank you for your input!