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In one study, long-term IGF-1 administration in old age animals increased neurogenesis, vascular density and glucose utilization in brain parts responsible for memory and learning [12]

The treatments were stopped by adding a final concentration of 2 mM phenylmethylsulphonyl fluoride (Sigma-Aldrich), followed by the incubation at 22 C for 10 min and centrifugation at 3000 g for 10 min

M.StaczykiewiczB.RymaszewskaJ

Recent evidence also indicates that exercise enhances SWS and thus leads to increase in GH release as well as brain-derived neutrotrophic factors (BDNF) and IGF-1 gene expression and protein levels (490,491)

While individuals with mild vitamin B 12 deficiency may not experience symptoms, blood homocysteine and/or MMA may be elevated (18)