Herbert V
Am J Clin Nutr. 1987 Apr;45(4):671-8. doi: 10.1093/ajcn/45.4.671.
Extensive evidence is presented that 2 micrograms (1.5 nmol) of cobalamin daily will not only maintain adequate vitamin B-12 nutriture but also a substantial reserve body pool in normal persons. Recommendations appropriate to this extensive evidence are presented.