D-chiro-inositol (DCI) is a natural sugar alcohol, an isomer of inositol, crucial for insulin signaling and glucose metabolism, often used with myo-inositol to support hormonal balance, particularly in Polycystic Ovary Syndrome (PCOS), helping with ovulation, insulin resistance, and metabolic health. It works as a second messenger for insulin, improving how the body uses sugar, and is found in foods like legumes and citrus, but supplements often combine it with myo-inositol in specific ratios for optimal benefits in fertility and metabolic support
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