side effects of having b12 injections Feeling worse after Injection: Answering concerns Does the Vitamin B12 Shot
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A mouse metabolises on a faster clock than a human, and a controlled diet in a cage is not a free-living human diet so even the week-numbers above should be read as the shape of a gradual response, not a promise that a human would see anything on the same calendar

The American Journal of Clinical Nutrition explains that malabsorption of the vitamins from food is the primary cause of vitamin B12 deficiency

Boost Your Energy and Wellness with B12 Injections Feel Better, Think Sharper, Sleep Deeper Naturally

Some protocols involve continuous administration for 6-12 months with periodic assessment and dose adjustment
