can you overdose with vitamin b12 injections Are Shots Right for You? Too Much B12 Symptoms: Overdose
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This could also be because Im only on the initial dose

This is not a stimulant or a short-term fix
How are Vitamin B12 injections administered

Deficiency can develop even in people who regularly eat meat and dairy, because the problem is often not how much B12 you consume but how well your body absorbs it

this is the most common cause of vitamin B12 deficiency in the UK a lack of these vitamins in your diet this is uncommon, but can happen if you have a vegan diet and do not take vitamin B12 supplements or eat foods fortified with vitamin B12, follow a restrictive diet or have a generally poor diet for a long time medicine certain medicines, including anticonvulsants and proton pump inhibitors (PPIs), can affect how much of these vitamins your body absorbs Both vitamin B12 deficiency and folate deficiency are more common in older people, affecting around 1 in 10 people aged 75 or over and 1 in 20 people aged 65 to 74