b12 injection side effects in elderly How Long Do The Of Injections Last Why do I feel so bad after a B12 injection? Vitamin B12 Injections for Aging
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Oxidative Stress and NAD+ in Ischemic Brain Injury: Current Advances and Future Perspectives

Pharmacies using methylcobalamin often emphasize the importance of light-protected storage
If harm at high doses is established then perhaps B12 has a therapeutic range, outside of which it causes harm

Beusenberg M

While there is some limited evidence of the efficacy of 1,000 micrograms daily dosing of oral cyanocobalamin, this is mainly based on the correction of serum vitamin B12 levels, rather than any impact on clinical signs and symptoms[24]
