Vitamin B12 Side Effects: Common, Severe, Long Term - Drugs.com
Oct 29, 2025 · Learn about the side effects of Vitamin B12 (cyanocobalamin), from common to rare, for consumers and healthcare professionals.
Vitamin B12: Overview, Uses, Side Effects, Precautions ... - WebMD
Learn more about Vitamin B12 uses, effectiveness, possible side effects, interactions, dosage, user ratings and products that contain Vitamin B12.
Vitamin B-12 - Mayo Clinic
Aug 13, 2025 · People with very low vitamin B-12 levels can have symptoms such as fatigue, muscle weakness, stomach problems, nerve damage, vision problems and mood changes. …
Vitamin B12 Side Effects - Healthline
Feb 24, 2025 · Learn about the side effects of taking too much vitamin B12. This article also looks at when to contact a doctor.
Too Much B12 Symptoms: 5 Warning Signs You've Gone …
Apr 30, 2025 · While many folks worry about B12 deficiency, we often overlook what happens when levels skyrocket into the danger zone. Too much vitamin B12 can cause several …
Cyanocobalamin (Vitamin B12): MedlinePlus Drug Information
What side effects can this medication cause? Cyanocobalamin may cause side effects. Call your doctor if you have any unusual problems while taking this medication.
Symptoms if You Take Too Much Vitamin B12 - Verywell Health
Aug 30, 2025 · Vitamin B12 is an essential vitamin, but taking too much can cause symptoms, including headaches, nausea, and vomiting, in some situations.
B12 Side Effects: Too Much of a Good Thing? - Greatist
Aug 6, 2024 · Learn about B12 over-supplementation side effects and how to manage your intake for optimal DNA production and brain health.
What Happens if You Take Too Much Vitamin B12? - MedicineNet
Vitamin B12 plays an essential role in many of your body's functions. If you take too much vitamin B12, you may suffer from nausea, vomiting, headache, diarrhea, tiredness or weakness, and …
Vitamin B12 Benefits and Side Effects: Dosage & Safety
Aug 21, 2025 · Learn vitamin B12 benefits, who may need it, whether it boosts energy, dosage for adults and seniors, B12 shots, side effects, and what high B12 levels mean.