Malnutrition is common in gynecologic cancer patients and worsens surgical outcomes. Immunonutrition (special nutrients like arginine, omega-3s, nucleotides, antioxidants) may help reduce infections, improve healing, and shorten hospital stays when used as part of Enhanced Recovery After Surgery (ERAS) protocols. However, challenges include high cost, poor patient compliance after surgery, and lack of standard guidelines. Evidence is promising but not yet conclusive—more research is needed before routine use.