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Some symptoms of vitamin B12 deficiency include: Weakness and tiredness Pale or yellowish skin Loss of appetite Heart palpitations Mouth or tongue soreness Tingling or "pins and needles" sensation in your hands and feet Shortness of breath Dizziness Blurry vision Mood swings or personality changes You are more at-risk for developing vitamin B12 deficiency if you are: Pregnant Over 65 Vegan Take medicine for diabetes Take medicine for heartburn Have had surgery to remove part of your bowels Medically Reviewed on 6/23/2026 Mayo Clinic: "Vitamin B-12." National Institutes of Health: "Vitamin B12." Oregon State University: "Vitamin B12." Top What Happens if You Take Too Much Vitamin B12 Related Articles 22 Healthy Foods High in B VitaminsAny deficiency of B vitamins can lead to various health conditions
Some individuals may experience a modest reduction in weight, while others may not see significant changes
Most B12 injections deliver a high dose typically 1,000 mcg of cyanocobalamin or hydroxocobalamin directly into muscle tissue
Reported side effects are generally mild in supervised use, such as injection site reactions, but the real risks come from unregulated products, incorrect self dosing, and skipping medical evaluation
Researchers exploring peptides for weight loss and muscle gain often look at this balance carefully
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