Intrinsic factor, a protein that shuttles B12 through the absorption process, becomes saturated after a meal containing an above-average amount of B12 and about 4 to 6 hours are required before it can efficiently absorb another dose (IOM, 1998)
Fischer graduated medical school at Medical University of South Carolina, in Charleston South Carolina
The assay for -glutamylcysteine synthetase activity is based on the formation of GSH from cysteine, glutamate and glycine in the presence of the excess of glutathione synthetase
Neurochem Res 22: 11651171
It is listed as a rare adverse reaction in UK product information for both oral and injectable B12 preparations, and most people tolerate B12 supplements well even at high doses
Methylcobalamin and adenosylcobalamin are absorbed by your body quickly which means you will feel the benefits sooner, while hydroxocobalamin stays in your system longer for sustained support