does a b12 injection make you tired How Fast Vitamin Shot Work? Why Do I Feel Worse

B12 injections for females are often the same as standard Vitamin B12 shots for weight loss, but many clinics tailor them with additional nutrients to support hormonal balance, energy, and metabolism

AAFP (2017, with ongoing relevance)

The immediate source of muscular energy includes compounds that require phosphorus for their formation

Low B12 levels can leave you feeling downright lousyfatigued, depressed, mentally foggy, and more

A robust immune system is your bodys first line of defense

In other cases, if your B level is normal and youre just low in the other Bs, your provider might intentionally choose a B-Complex without B to avoid unnecessary injections