They can help with losing weight at this age. However, you should take supplements not to promote weight, but rather to detoxify the body, and give it a nutrient that it is deficient in, Dr. Gioffre says. “For example, if a plant wilts, you give it water because it needs water, and our bodies are no different.”  There are a few supplements that we are all deficient in, even children, but you still need to run these by your health care practitioner, he adds.