Bad Taste in Your Mouth? It Could Be Your RA Medication myRAteam Why I Tell My Friends And Family To Never Get B12 Shots B12 shots sound helpful but there is something important you need to know. When B12 enters the body through a Metallic Taste in Mouth: 10 Common Causes (& What to Do) Tua Sade Im Sure Its That #wait, Vitamin B12 deficiency can be surprisingly serious, especially when it comes to the nervous system. Without enough B12, the body struggles to make healthy red blood cells