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doi: 10.1023/A:1006175504673

Paolicelli RC, Bolasco G, Pagani F, Maggi L, Scianni M, Panzanelli P, et al

Monthly B12 injections or high dose oral supplements (0.5 mg) can be prescribed to correct a diagnosed deficiency but many researchers feel that it is a good idea for everyone over the age of 50 to take a B12 supplement, which includes at least the daily value of 2.4 micrograms

other studies have found no significant difference
