IGF1 LR3 Peptide Anderson Longevity Clinic IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society Table 1 from Serum concentrations of insulin like growth factor (IGF) 1 and IGF binding protein 3 (IGFBP 3), IGF 1 IGFBP 3 ratio, and markers of bone turnover: reference values for French children and adolescents and z score comparability IGF1 LR3 Peptide Anderson Longevity Clinic