Just want to second everything MrsD says here. Both of my adult daughters and myself have this deficiency, severely. Solgar b12 methylcobalamin 5,000 mcgs reverses deficiency in us and we get it from
www.iherb.com
Quote:
Originally Posted by mrsD
That is no longer true. There are studies showing high dose oral B12 1000-5000mcg daily will be absorbed passively without intrinsic factor.
About 1-10% can be absorbed and this is above the RDA range of 2-4mcg. But people without intrinsic factor need to take the B12 on an empty stomach because food can absorb it and prevent the passive (without intrinsic factor) absorption. The link I gave has a link to the AAFP medical site that gives oral studies results.
Methyl version is the active form, and preferred because some cannot convert the synthetic to methyl in the body well. Methylcobalamin is still not commonly available at store locally, but online it is so inexpensive that you can get it that way. iherb.com and Puritan's Pride both have for very low prices.
Many doctors don't know about methylcobalamin, proper serum lab ranges, or dosing. That is why I provide the information for you that is newer. The AAFP site was written in 2003, so it is really not "new" anymore.  |