how long do you give b12 injections the Benefits of Vitamin Last? How to Give a B12

In a randomized controlled trial in 72 subjects with migraine, 50,000 IU (1,250 mcg) of oral vitamin D every two weeks plus a daily multi-strain probiotic providing 450 billion colony forming units (CFUs) for 12 weeks reduced the frequency and severity of migraines (Tirani 2024)

Incase anyone reads this: it took 10 days to get back to normal sleep, which tells me my B12 levels are going back to normal, this was a nightmare

This does not make it the most effective, which remains debated, but it does make it among the best characterized for safety

10.15252/embj.201696151 71 ZhangP.McGrathB

Individuals experiencing fatigue often report feeling more energized within days of receiving a B12 injection

10 Patient-reported instruments have been developed and validated to identify the contributory factors to patient safety incidents in primary care