Actually, if you have ADD then you may benefit from SAMe. The attachment is some notes from William Walsh of the Pfeiffer Treatment Center. He says that high histamine types do better with SAMe in the beginning as opposed to using methionine. Methionine is cheaper than SAMe.
http://www.hputest.nl/lit109.docThese notes explain what is good IF you have high histamine levels. I don't know what your histamine levels are like, but am guessing about this. I am not suggesting that you should take some diagnosis from some forum poster. You do need to research this further. His notes may seem somewhat randon; they really need to be looked at in the context of understanding the orthomolecular approach. But the notes basically some up the important nutrients needed for the different types. Research the high histamine type, for example, to see if you have any of the signs for this condition.
I have posted about using tryptophan or 5htp. You should not use either unless you have sufficient vitamin b6 and niacin levels. But if you use either one you can cause some toxicity to your brain.
This is the best explanation I know of about this toxicity.
Niacinamide-adenine dinucleotide (NAD) is an active enzyme that is required for the proper function of vital areas of the brain. In schizophrenia, there appears to be a failure to deliver enough NAD to the brain. Vitamin b3 is required for the transformation of tryptophan, an amino acid, into NAD. If there is a niacin deficiency, this necessary transformation of trypotphan into NAD is inhibited, and there is not only a NAD deficiency established, but there is also an overload of tryptophan in the brain’s chemistry. Tryptophan is considered to be one of the most toxic of amino acids. An overload of it in the brain can be very harmful, especially if it is not properly converted into NAD, because it can cause undesirable perceptual and mood changes. If there is a b3 deficiency, for whatever reason, the consequent NAD deficiency will lead to ever-increasing tryptophan overload uninterruptedly unless and until the proper levels of b3 are given.
Pyridoxine, or vitamin b6, is used in the treatment of cerebral allergies by many Orthomolecular physicians. There is clinical evidence that pyridoxine is involved in the tryptophan-niacin metabolism previously explained. Morever, b6 is a precursor to over 60 enzyme reactions, is necessary for the proper metabolism of all amino acids, and is required for the maintenance of a stable immunologic system.
Source: Brain Allergies: The Psychonutrient Connection by William H. Philpott, MD and Dwight K. Kalita, Ph.D.
I think all the different amino acids are too many. It seems like you don't know what you should focus on. You have GABA, tyrosine and 5htp. Do you really think you have that many neurotransmitter problems?
