Thank you everyone! I hadn't thought about going to the ADHD websites themselves. And on the National Resource Centre on ADHD, I found info about alternative treatments, including this:

Chiropractic

Some chiropractors believe that chiropractic medicine is an effective intervention for AD/HD.28, 29, 30 Chiropractic is based on the belief that spinal problems are the cause of health problems and that spinal manipulations ("adjustments") can restore and maintain health. Advocates of this approach believe that imbalance of muscle tone can cause an imbalance of brain activity, and that spinal adjustments as well as other somatosensory stimulation, such as exposure to varying frequencies of light and sound, can effectively treat AD/HD and learning disabilities.31

Other chiropractors believe that the skull is an extension of the spine and advocate a method called applied kinesiology, or Neural Organization Technique. The premise behind this approach is that learning disabilities are caused by the misalignment of two specific bones in the skull, which creates unequal pressure on different areas of the brain, leading to brain malfunction.32 The bones are the phenoid bone at the base of the skull and the temporal bones on the sides of the skull. The theory says that this bone misalignment creates unequal pressure on different areas of the brain. This misalignment is also said to create "ocular lock," an eye-movement malfunction that contributes to reading problems. The advocates argue that since eye muscles are attached to the skull, if the cranial bones are not in proper position, malfunctions in eye movement (ocular lock) occur. Treatment consists of restoring the cranial bones to the proper position through specific bodily manipulations.

These theories are not consistent with either current knowledge of the causes of learning disabilities or knowledge of human anatomy, as even standard medical textbooks state that cranial bones do not move. No research has been done to support the effectiveness of chiropractic approaches for the treatment of AD/HD.