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Benefits Vitamin B12 injections can improve blurred vision, depression, anxiety, mobility issues, dizziness, fatigue, memory issues, irritability, and loss of appetite

The authors also thank Erica Bender for performing finger pricks and venipunctures in human trials and Vicky Simon for running the Immulite system in the Human Metabolic Research Unit in the Division of Nutritional Sciences

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Common signs include: Ongoing fatigue or weakness Pale skin Numbness or tingling in the hands and feet Brain fog, forgetfulness, or trouble concentrating Low mood, anxiety, or irritability Poor appetite or digestive upset When B12 is low, your metabolism slows, you have less energy for activity, and appetite signals can get thrown off, all of which make weight loss harder