But it can take anywhere from hours to a day to see B12 blood levels rise after injection, Foxx says
Profound fatigue and weakness are common, even with minimal activity
Neurological Changes : Numbness, tingling, and weakness in hands and feet from nerve damage
Nasser Nasseri, MD At Noor Medical Spa, Dr
They should be kept at room temperature, away from moisture, heat, and especially light, as light can make the vitamin unstable
Typical injection spots are: The abdomen , a couple of inches away from the belly button The outer thigh The back of the upper arm These are easy for self-injections too but again, only once a professional has shown you how to do it correctly