what happens when you stop taking b12 injections Vitamin Deficiency: Symptoms, Causes & Treatment Can Vitamin B12 Deficiency Indicate

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Symptoms of deficiency can vary from person to person, but may include impaired brain function, tiredness and lack of energy, breathlessness and fatigue, headaches, pale skin, heart palpitations, loss of appetite and weight loss, anxiety and depression

If you have MTHFR gene mutations (common in thyroid patients), cyanocobalamin may be particularly ineffective for you, making methylcobalamin even more important

Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors