do b12 injections cause hypervitaminosis in autistic children From Food to Brain: The Long Journey of Vitamin Is there a Connection Between

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Vegetarian sources of B12 include chlorella, nori, nutritional yeast and certain mushrooms, but many vegans and vegetarians have insufficient levels of B12 because its not widely found in plants. According to Mullane, not getting enough B12 can result in issues like anaemia, fatigue and more intense symptoms including shortness of breath, palpitations, pale skin, muscle weakness, numbness and tingling in hands or feet, blurred vision and memory loss

it can cause some health concerns

Some people notice nausea, diarrhea, constipation, or stomach pain when they use semaglutide with B12

PMID: 18835072