A maintenance dose typically provides 1000 mcg
Genuine B12 deficiency can contribute to anxiety-like symptoms, irritability, low mood, and a "wired but tired" feeling and correcting it can meaningfully improve how you feel
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It depends on the person and the severity of the pain
You should get B12 shots weekly to monthly for maintenance and IV infusions monthly to quarterly for broader wellness support, though frequency depends on deficiency severity, health goals, and your providers recommendation
Older adults are more likely to be deficient in vitamin B12 due to a number of factors, including decreased stomach acid production and decreased absorption of vitamin B12 from food