Causes of a Metallic Taste in Mouth B12 is one of those vitamins that doesnt get enough credit , At a very basic level, B12 helps your body make healthy red blood cells. Red blood cells are what carry oxygen from your lungs to the TikToker shares 'terrifying' Vitamin B12 deficiency symptoms that left her unable to speak or walk The Times of India 7 Reasons Behind Sour or Bitter Taste in Your Mouth Metallic Taste in Mouth: 10 Common Causes (& What to Do) Tua Sade Vitamin B12 deficiency symptoms: Metallic taste in your mouth can mean you're lacking B12 Express.co.uk