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Other substituents: modifications can fine-tune potency and selectivity, potentially reducing off-target activity
For example, you can get 100mcg vitamin B12 tablets for 5p each at a supermarket (2.80 for 60, Sainsbury's) compared to a branded version from Solgar which, at 85p a tablet, makes them 17 times more expensive
[114] This functionality is lost in vitamin B 12 deficiency, and can be measured clinically as an increased serum methylmalonic acid (MMA) concentration
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It is converted by the body into Adenosylcobalamin and Methylcobalamin so they can be absorbed
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