At comparable oral doses almost identical B12 concentrations were initially detected in the blood serum
Maintenance therapy generally requires monthly injections, though some individuals benefit from biweekly administration depending on their bodys utilization rate and any ongoing absorption challenges
However, this is not the case because the body absorbs B12 oral supplements and injections differently
Williams, A novel role for vitamin B12: Cobalamins are intracellular antioxidants in vitro, Free Radical Biology and Medicine, Volume 47, Issue 2, 15 July 2009, Pages 184-188, ISSN 0891-5849, J
If you've confirmed your B12 levels are adequate and you're still fatigued, it's time to widen the investigation
Naturally, when a B12 deficiency is suspected or diagnosed, the next question often arises: whats the best way to get it back on track