b12 injection guide Safe at Home B12 Injection Dosage and Frequency:

Experts may recommend oral supplements or vitamin injections if a person has low vitamin B12 levels because of health conditions

When NAD+ levels drop, mitochondrial function suffers, energy production declines, and metabolism slows

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So if its been identified via a blood test (through a health professional) and your doctor recommends injections, it is important to get those B12 levels up