can you overdose with b12 injections Shots at Home: How, Where & How Often to Inject Yourself Vitamin B12 Dosages: Your GoodRx

rapid IV push of concentrated B vitamins can cause dizziness or flushing

The compound is also listed on anti-doping monitoring programs , and its use in competitive sport is restricted or banned in many jurisdictions

A 2019 study found sublingual B12 supplements (aka the kind you put under your tongue) were even more effective than B12 shots

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Symptoms may include: biotin hives (in rare instances) Skin rash (mild) Facial swelling Upset stomach Diarrhea Other Symptoms of Reactions to Too Many B Vitamins An overdose of B vitamins may cause an allergic reaction with symptoms that include: Skin Rash This might appear red with small bumps all over and itchy