Whether or not a 12 year old needs to take DHA supplements should be determined by the development of the brain. If the brain is developing well, supplementation is usually not needed, while the opposite is true. DHA is a polyunsaturated fatty acid, which can promote the development of intelligence and eyesight, but most 12-year-olds have normal brain development, so they do not need to take DHA, and DHA is only a substance that makes up the brain and retina, and taking it for a long period of time will not allow the nerve cells to develop additionally. If a 12 year old child has poor brain development, then you can consider using DHA to promote brain development, but it should be noted that DHA is only a health care product, there is no medical efficacy, so for the disease, you should still follow the doctor’s instructions for treatment. In summary, 12-year-old children with normal brain development, do not need to use DHA, if there is discomfort, timely consultation, do not be negligent, so as not to miss the condition.