The dose depends on how bad your deficiency is, your health, and other things
The following are our recommended vitamin B12 injection needle size and gauge: B12 Shots Needle Size (Length) For subcutaneous B12 injections, we suggest using shorter 4-5mm needles
It has its own formula and schedule, depending on where you are
Ive written about the benefits of B12 shots here, but I will quickly go over the most common benefits that I see in my patients: Increases energy and reduces fatigue Increases metabolism and basal metabolic rate Helps with weight loss Improves sleep and circadian rhythm Increases mood and concentration Boost in immune function Increases hair growth The benefits depend on the person and what symptoms they have prior to taking the B12 shot

Benefits of B12 for Older Adults B12 has a number of benefits for overall health in older adults: Boosts energy and reduces fatigue Prevents memory loss and reduces the risk of dementia and Alzheimers Improves mood and reduces depression and anxiety Reduces the risk of heart and arterial disease Normalizes cholesterol levels Promotes healthy skin, hair and nails Fosters a healthy gut biome to improve digestion Supports DNA synthesis and mitochondrial function Helps prevent cancer, including cervical, prostate and colon cancers Supports red blood cell production and prevents anemia