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What to avoid Certain combinations should be avoided or approached with extreme caution
Select and sanitize the injection site - upper thigh, abdomen, or upper arm for intramuscular, or belly fat for subcutaneous
Though the link isnt well understood, scientists have linked the vitamin to serotonin and depression in people with a deficiency
Reach your care team with questions about dosing, side effects, or your progress
Typical cycles run 4 to 12 weeks
However, how quickly you see these results depends on how you take B12
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