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Follow-up blood work is the clinical gold standard, and we typically re-test after a set number of injections to confirm your levels are rising into a healthy range
For example, a 2019 study of over 9,000 adults found people with obesity had lower blood levels of vitamin B12 (8)
Metabolism: B12 is a cofactor in processing fats and proteins
With that in mind, here is a realistic timeline for people who are correcting a genuine deficiency
Within the first week , many patients notice subtle improvements in energy levels and general wellbeing, though this is not universal
On a scale of 1 to 10, what is my energy level
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