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It may be time to consider a Vitamin B12 injection if you are experiencing common symptoms, including: Weakness, fatigue, or lightheadedness Heart palpitations Pale skin Mouth or tongue soreness or bleeding Constipation, diarrhea, loss of appetite, or gas Numbness or tingling, muscle weakness, and problems walking Vision loss Possible depression, memory loss, or behavioral changes Anemia Intestinal disorders and weight loss Vitamin B12 injections can potentially treat anyone experiencing symptoms associated with a deficiency

However, many current studies are primarily focused on improving the pharmacodynamic and pharmacokinetic properties of copper, while data on copper-induced dermal toxicity remain limited

Blood 118 , 25782588 (2011)

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You've ruled out other causes like product interactions or contamination