Strict vegans who do not include two to three servings of fortified foods in their daily diet for those following a largely plant-based diet, foods that are fortified with vitamin B12, such as nutritional yeast, plant milks, spreads and breakfast cereals, make valuable additions to your diet
"The Brain Hepatocyte Growth Factor/c-Met Receptor System: A New Target for the Treatment of Alzheimer's Disease." Journal of Alzheimer's Disease
Standard options often fall short because they cannot survive the journey through your digestive tract
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This can be likened to a relay race whereby a baton is transferred from one runner to the next, where the runners include vitamins C & E, Coenzyme Q10, lipoic acid and glutathione (amongst others)
Endocrinology (2005) 146(9):368692