If this stuff worked, your child's psychiatrist or Developmental Pediatrician would be the first one to tell you about it and we would all be using them and raving about the resluts. These doctors regularly recomend Melatonin over presecription sleep medications because it works, and so it would be for any remedy for ADHD, "natural" or otherwise. There is no reason that any doctor would not have your child's best interests at heart wanting them to get well. They prescribe medications, because they work and that is in your childs best interest.
ADHD is a problem in the brain at a molecular level in the brain. Brains are flesh and blood, and brain cells do not touch. The tiny space between each cell is called a synapse. When we think, our thoughts are carried over the brain cells in the form of an electrical impulse. When the impulse reaches the synapes, our brains make chemicals, called neurotransmitters, to carry the electrical impulse over the synapes to the next brain cell. If your child does not make enough neruotransmitters, or the neurotransmitter recpetors are defective, your child has ADHD, and cannot rely on his thoughts to be complete with any reliablity. Some make it, but a great many do not. Medications work becasue they either help the brain produce more neurotransmitters, or help the brain uptake them more effectively, so that the child's thought process is not interupted repeatededly.
Check into so heavy reading, by anything written by the very best experts you can find on ADHD, that would be Dr. Mel Levine and Dr. Russel Barkely. Any of their books will give you quality information about assessment, treatment, strategies, and theraputic, medical, educational, and behavioral interventions that will work.
M.