AMH and obesity due to melanocortin 4 receptor deficiency: A study by Chakraborty et al. evaluating the association between vitamin D profiles and different indices and clinical features of PCOS, including AMH levels, insulin resistance, hyperandrogenism, and obesity indices found a direct correlation between vitamin D and AMH levels in PCOS phenotype A. In addition, an agonistic relationship between vitamin D and insulin resistance was present in the study population [128].