degradation of b12 injections by age How Aging Impacts Vitamin Absorption and Your Health Photolysis: How Long Can B12
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J Nutr 2003;133(2):601S8S

Its also the prodromes which are the worst

Injections can provide the necessary building blocks, particularly when appetite is low or digestive function is impaired

There isn't one winner in the b complex vs b12 discussion
