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They also arent even used in the same way prescription and over-the-counter medications are
However, the effect of oral vitamin B 12 varies among patients (13), and the available randomized controlled trials comparing the two treatment regimens are considered to be of low quality (14)
found only in foods of animal origin Foods that are high in vitamin B 12 (g/100g) include: Liver (2658) Beef and lamb (13 Chicken (trace) Eggs (12.5) Dairy foods (0.32.4) In normal humans the absorption of vitamin B 12 from foods has been shown to vary depending on the quantity and type of protein consumed
B12 is involved in the key metabolic process called "One Carbon Metabolism" though, and that process can be linked to a great many critical bodily functions, including detoxification among others
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