can b12 injections make you nauseous Common & Rare Side Effects of Vitamin Feeling worse after B12 Injection:

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Symptoms of vitamin B12 and folic acid deficiency anemia include: Shortness of breath Headache Indigestion Loss of appetite Heart palpitations Vision problems Feeling weak or tired Diarrhea Pain or redness of the tongue, sometimes with mouth sores Problems with memory, comprehension, and judgment (cognitive changes) Some of these symptoms may also occur in people who are deficient in vitamin B12 or folic acid but are not anemic

Unprescribed wellness or weight loss treatments Some wellness companies and alternative medicine providers offer vitamin injections without a prescription or proper medical evaluation

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And they will often present maybe with weight loss

A majority of lipotropic injections combine three lipotropes that are referred to as MIC, a term referencing methionine, inositol, and choline