proper injection technique and site rotation can minimize these local reactions, and they tend to resolve quickly on their own
Therefore, the aim of this study was twofold: 1) to assess vitamin B12 serum levels in ME/CFS patients before and after use of high dose vitamin B12 nasal drops and 2) to compare the changes in function before and after starting therapy, using an activity meter, the physical functioning score of the Rand 36 questionnaire, and both the fatigue and concentration scales of CIS20r questionnaire

Intramuscular (IM) B12 injections using hydroxocobalamin, the preferred licensed form in the UK are recommended when: Oral supplementation has failed to correct a documented deficiency The patient has difficulty adhering to daily oral regimens Serum B12 levels remain persistently low despite adequate oral dosing There is clinical evidence of neurological or haematological complications In line with BNF guidance, the standard IM regimen for confirmed deficiency without neurological involvement is a loading course of 1 mg hydroxocobalamin on alternate days for two weeks , followed by maintenance of 1 mg every three months
No blinded assessment
2016 Oct;1863(10):2422-35
You can get Vitamin B12 shots in three ways: intramuscularly (IM), subcutaneously, or intravenously (IV)