B12 Injection Dosage and Frequency: 7 Essential Guidelines for Adults Liv Hospital Feeling tired, foggy, or run down? It could be a B12 deficiency Weekly B12 injections help support: Increased energy + reduced fatigue Sharper focus + better mood Boosted The Truth About B12 Injections: Benefits, Cost & How They Work 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 Long Does It Take for Vitamin B12 to Work? Simple Guide