Too Much B12 Symptoms: Overdose Signs & Safe Dosage Bolt Pharmacy A little insight to the importance of the b12 injections. My client hadn't been feeling well & had some bloods done with her GP. The results identified a severe deficiency in b12. How Dangerous Are High Vitamin B12 Levels? The People's Pharmacy How Long Does It Take to Recover from Vitamin B12 Deficiency? 6 B12 injections so far and new blood results : r B12_Deficiency Vitamin B12 Injections: What You Need To Know