on alternate days until there is no further improvement
67 MadiganSMTraceyFMcNultyHEaton-EvansJCoulterJMcCartneyHet alRiboflavin and vitamin B-6 intakes and status and biochemical response to riboflavin supplementation in free-living elderly people
It is not necessary to withhold vitamin B12 therapy until the precise cause of B12 deficiency is established since absorption studies can be performed at any time
Causes and Risk Factors Fungal infections are caused by hundreds and millions of fungi present in the environment
(PubMed) Liu C, Cao F, Tang QZ, et al
Common side effects of B12 injections These B12 effects tend to resolve on their own within a day or two: Injection site reaction, such as mild soreness, redness, or swelling Brief itching or warmth at the injection area A feeling of fullness or pressure in the muscle Mild headache or nausea shortly after the shot These reactions are typically related to the injection itself, not the vitamin