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Serum levels of insulin-like growth factor I (IGF-I) and IGF binding protein 3 reflect spontaneous growth hormone secretion
B12 is crucial for converting food into usable energy, so restoring optimal levels can significantly reduce tiredness and lethargy
Colla, R., Izzotti, A., De Ciucis, C., Fenoglio, D., Ravera, S., Speciale, A