There are no safe medications or supplements that can target and reduce fat specifically in your stomach or chest. Overall fat loss requires a consistent caloric deficit achieved through a balanced diet and regular cardiovascular and strength training. If chest fat is related to a hormonal imbalance (gynecomastia), please consult a physician. For grey hair, supplements like Vitamin B12, Vitamin D, Zinc, and Iron can help only if you have a diagnosed deficiency. Genetics primarily determine greying, and once hair loses pigment genetically, supplements cannot reverse it. I recommend consulting a doctor for blood tests to check for nutrient deficiencies or hormonal imbalances before starting any new supplements.