b12 injection subcutaneous dosage Cyanocobalamin USP 1000 mcg/mL Vitamin B12 Injections (Cyanocobalamin Injections)

So high TSH alone will confirm a suspected diagnosis of primary hypothyroidism but if you suspect secondary hypothyroidism, then you should check T4 as well if they are both low, then this will confirm a suspected diagnosis of hypothyroidism

Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12. Chloramphenicol and other drugs having bone marrow suppressant properties may cause a lack of therapeutic response to vitamin B12

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B12 is essential for maintaining the protective sheath around nerves and ensuring fast, effective communication between your brain and muscles