http://www.ncbi.nlm.nih.gov/pmc/arti...able/T1/#TF1-4
The second column is a list of absorption of oral in patients with PA (pernicious anemia). They have broken intrinsic factor --which will allow small amounts of B12 to be absorbed in the intestine. Notice that small B12 doses are not well absorbed by PA patients.
In normal patients 1000mcg gives 13mcg absorbed. In PA patients, 12mcg. This illustrates the passive absorption ceiling so to speak.
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.