A B12 injection may be worth discussing if: You have absorption problems: Conditions like Crohn's disease, celiac disease, or atrophic gastritis can reduce how well your body absorbs B12 from food, and past gastric surgery can have a similar effect
Most users report noticing initial improvements within 5-10 days for acute injuries
I don't see how you are getting that only 5mcg is lost daily: if you have injected say 1000 mcg of B12, most of it is peed out within a few days
It produces powerful antioxidant activity which destroy free radicals
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Anti-Inflammatory Properties: Reduces swelling and supports tissue recovery