There are no official guidelines to assist in answering this question. I will search for relevant research papers instead.
From the FDA Drug Label
CLINICAL PHARMACOLOGY Vitamin B12 is essential to growth, cell reproduction, hematopoiesis, and nucleoprotein and myelin synthesis. The FDA drug label does not answer the question.
From the Research
Vitamin B12 Dosage for Adult Athletes
- The appropriate dosage of vitamin B12 (Cobalamin) injection for an adult athlete is not explicitly stated in the provided studies, as they primarily focus on treating vitamin B12 deficiency in the general population.
- However, the studies suggest that the dosage of vitamin B12 injections can vary depending on the individual's needs and the severity of the deficiency 1, 2.
- A common recommendation for maintenance therapy is 1000 micrograms of cyanocobalamin or hydroxocobalamin once a month 1, 3.
- Some studies suggest that higher doses, such as 1000 micrograms every two months, may be necessary for individuals with malabsorption 2.
- It is also noted that oral supplementation with high doses of vitamin B12 (1000-2000 mcg) may be as effective as intramuscular administration in achieving hematological and neurological responses 4.
- The optimal long-term management of vitamin B12 deficiency with intramuscular therapy is not well established, and individualized injection regimens may be necessary 2.
Factors Influencing Dosage
- The cause of the vitamin B12 deficiency, such as malabsorption or reduced dietary intake, can influence the choice of treatment and dosage 2.
- The individual's ability to absorb vitamin B12, as measured by the CobaSorb test, can also impact the effectiveness of treatment and the required dosage 5.
- Clinical experience suggests that up to 50% of individuals may require more frequent administration of vitamin B12 injections to remain symptom-free and maintain a normal quality of life 2.