What are the concerns about IGF-1 in milk?
Many studies have noted some links associated between IGF-1 levels and increased risk of cancer, especially breast and prostate cancer. (Holmes, Pollak, et. al. Dietary Correlates of Plasma Insulin-like Growth Factor I and Insulin-like Growth Factor Binding Protein 3 Concentrations Cancer Epidemiology, Biomarkers, and Prevention, Sept. 2002, p. 852-861; Chan, Stampfer, et. al.Plasma Insulin-like Growth Factor-I and Prostate Cancer Risk: A Prospective Study, Science, January, 1998, p 563-566; Yu, Jin, et. al, Insulin-like Growth Factors and Breast Cancer Risk in Chinese Women, Cancer Epidemiology, Biomarkers, and Prevention, August 2002, p. 705-712.