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B12 helps your body convert fat and protein to provide energy to your body, says Peter Kozlowski, M.D., a functional medicine doctor in Chicago
Low B12 is clinically associated with low mood, anxiety, and emotional flatness
Tendon pain may be related to overuse, poor loading mechanics, inflammation, partial tearing, inadequate recovery, metabolic health, medication exposure, or age-related tissue changes
Two useful places to review next If you want a better sense of who should pause or adjust treatment before starting, these pages on vitamin injection contraindications and screening and tailored dosing for vitamin injections offer a practical next step
Consult your doctor before starting supplements, as medications like metformin can block B12 absorption
How bad the rash is depends on how much vitamin B you take in
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