Typically, B12 injections begin working immediately and the body will begin making new red blood cells within 72 hours
Running a B12 deficitwhich about six percent of Americans under the age of 60and 20 percent of those over 60 do (1)puts you at risk for muscle weakness, fatigue, depression, memory issues, erectile dysfunction, and a cluster of symptoms that can be so severe that theyre debilitating
It includes thiamine (Vitamin B1), which helps with energy and brain health, mainly for those with neurological issues
Additionally, the issue is exacerbated by traditional laboratories setting the 'normal' range too low, which may result in undiagnosed B12 deficiencies
B12 is water-soluble, and most of it is urinated out
Standard therapeutic dosages usually fall in this range, with 1000 mcg often suggested