Unexplained weight loss is a symptom, not a disease, and requires a proper medical evaluation before taking any treatments. There is no safe, one-size-fits-all medicine or supplement to reverse it without knowing the root cause, which could range from thyroid issues and diabetes to nutritional deficiencies or underlying illness. I strongly advise consulting your doctor for a physical exam and blood work to find the exact cause. Avoid self-prescribing weight-gain supplements, as they can be harmful or mask serious conditions. Until your appointment, focus on eating small, frequent, nutrient-rich meals.