how often are b12 injections given Shots at Home: How, Where & to Inject Yourself B12 Injection Dosage and Frequency:

If my doctor stopped my injections and told me to take oral tablets I would simply carry on self-injecting and I suspect a great many other patients would do so too

What this data doesn't tell us: whether NNMT suppression sustained beyond 12 weeks alters NAD+ metabolism in ways that affect mitochondrial function, whether methylation pathway compensation occurs over longer timescales, or whether adipose tissue remodeling continues linearly or plateaus

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B12 injections are a common treatment prescribed by healthcare professionals for people with a vitamin B12 deficiency