Explorative Study on Addition of High-fiber Dried Chicory Root in Patients With an Intermediate to High-risk Cutaneous Melanoma.

This study is testing whether adding a high-fiber dried chicory root supplement to the diet — after surgical removal of an intermediate to high-risk skin melanoma — can improve the gut microbiome (the community of bacteria in your gut) and potentially support the immune system in preventing the cancer from returning. **You may be eligible if...** - You are 18 or older - You have had surgery to remove an intermediate or high-risk melanoma (specific staging criteria apply) - There is no evidence that the cancer has spread - You are not currently receiving any other adjuvant (post-surgery) cancer treatment - You can read and speak Dutch and are willing to attend study visits **You may NOT be eligible if...** - You are currently receiving adjuvant cancer therapy (treatment after surgery) - You have diabetes, heart disease, kidney disease, or autoimmune conditions - You have gut conditions like inflammatory bowel disease, celiac disease, or short bowel syndrome - You have an ileostomy or colostomy - You have used antibiotics in the last 3 months - You are taking immunosuppressive medications or steroids - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.