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Vitamin B12 is key for healthy red blood cells, nerve function, and DNA

Castilla-Cortazar I, Pascual M, Urdaneta E, Pardo J, Puche JE, Vivas B, Diaz-Casares A, Garcia M, Diaz-Sanchez M, Varela-Nieto I: Jejunal microvilli atrophy and reduced nutrient transport in rats with advanced liver cirrhosis: improvement by insulin-like growth factor I

Insulin-like growth factor-I: potential for treatment of motor neuronal disorders

Your GP may arrange periodic blood tests to ensure B12 levels remain adequate, though clinical response is generally more important than specific blood values once treatment is established