Wow guys, you've been gate keeping!! Got my first B12 injection last week and it's like I am awake for the first time since having kids 20 years ago It's Vitamin B12 Injection Dosage for Adults: 7 Key Medical Guidelines Liv Hospital Question of the Day:, How long does it take for a B12 injection to rev up the engines of energy? , For many people, the boost can be felt within 2448 hours. Others may notice gradual changes How Quickly Does a B12 Shot Work? Benefits & What to Expect How Long Does It Take Vitamin B12 Injections to Work? Do Injections break your fast? The answer might surprise you!, Many of us fall ill during Ramadan and worry that a necessary shot will ruin our fast. Sheikh Al Naqwi clears up the confusion:,