Epidemiological evidence in some cases hints that the accepted dosages of vitamin B helps only to avoid their marginal deficiency and further benefits could accrue from higher dosages than those provided by RDA (4-5)
Omega-3 and omega-6 polyunsaturated fatty acids: Dietary sources, metabolism, and significance - A review
To separate and quantify the conjugates GS-TNB and CYS-TNB, a gradient elution method was implemented using eluent A, 7/10/83 (v/v/v) methanol/100 mM K-phosphate buffer, pH 6/water and eluent B, 30/10/60 (v/v/v) methanol/100 mM K-phosphate buffer, pH 6/water
Another important distinction worth making: delayed gastric emptying is NOT the same as gastroparesis (stomach paralysis)
Moreover, it is very rare that any forms of vitamin B12 are found in plant-based foods, making a dietary supply of B12 difficult for vegans to obtain (see here: Vitamin B12 for Vegetarians and Vegans)
When discussing supplements with your doctor, the delivery method is just as important as the dosage
