do b12 injections make you feel sick I Tired All the Time. I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine Why do I feel worse

The timeline for feeling the effects of a B12 shot can vary based on how deficient a person is at the start of treatment

One common cause of persistent fatigue and low energy that we often see in our practice is Vitamin B12 deficiency

Im particularly grateful to Dr Josh for his clear, candid explanations and honesty throughout, which made the whole experience very reassuring

People with a prior history of gastrointestinal problems and aged individuals are more likely to suffer from intense stomach cramps and severe diarrhoea after taking high doses of vitamin B. Most people are able to get enough vitamin B12 from their diets, however, occasionally when running low, supplements or B12 injections may be recommended