b12 injection and covid-19 vaccine COVID Booster Shots: Everything You Need to Know | The Brink Page 7 | Vitamin b12
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Age is another factor to consider

However, the ideal frequency can vary based on the severity of the deficiency and your response to treatment

Folate and vitamin B12 supplements may help lower homocysteine levels in the blood while increasing energy and overall well-being

If you are taking high-dose supplements, your GP might recommend reducing to a maintenance dose once deficiency is corrected