AMH and polycystic ovary syndrome: Notably, after adjustments for age, BMI, and AMH, our findings revealed that the risk of PCOS-HOR escalated by 1.02 (95% CI 1.01–1.05; P=0.019) with each SD increase in cysteine levels and 4.17 (95% CI 1.58–11.16; P=0.004) with each SD increase in 5-methoxytryptamine levels (Fig. 4 and Supplemental Table 5).