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Both vitamin B12 deficiency and folate deficiency are more common in older people, affecting around 1 in 10 people aged 75 or over and 1 in 20 people aged 65 to 74
If youre correcting a deficiency, you might start with weekly injections and shift to monthly maintenance
Vegetarians and vegans who lack dietary sources of B12
Both oral cyanocobalamin and injectable hydroxocobalamin list diarrhoea as a rare adverse reaction in UK product information
When serum B12 is normal but MMA is elevated, this may indicate a functional B12 deficiency and may be treated with high-dose injections of vitamin B12, which help bypass barriers to absorption
Khanduri, U., & Sharma, A
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