The dosage and frequency of therapy required depends on the clinical condition of the animal and the copper status, as assessed by blood and liver levels both before and after therapy
Although rare, adverse effects of high-dose vitamin B12 have been reported, including allergic reactions such as fever, rash, itching, hot flushes, dizziness, and nausea, across all cobalamin forms and administration routes (Caballero et al., 2007)
Its important to remember that while B12 injections can address fatigue related to deficiency, they are not a universal solution for tiredness caused by other medical or lifestyle factors
For individuals with minimal subcutaneous tissue, discussing injection technique with a provider can reduce discomfort significantly
For a detailed breakdown, the National Institutes of Health provides a great list of B12-rich foods that can help you make informed choices at the grocery store