feeling more tired after b12 injection I Feel All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine b12 injection makes me sleepy
Description
The jury is out, to be honest: the body does indeed absorb Cyanocobalamin very well but Methylcobalamin is considered to be retained better and for longer out of the different types of vitamins
For example, concurrent use of chloramphenicol (an antibiotic) may attenuate the hematologic response to vitamin B therapy

Another major application is in signal-transduction pathway research , particularly those involving cAMP-mediated cascades

In addition, your pediatrician can order this standard CBC bloodwork