hmm, it's a couple of years now since dd1 was tested, and probably a year or so since we took a break form supplementing, but here goes.
we did a couple of tests with dd1 - a urine analysis, and a saliva analysis, iirc.
found soem interesting results. she was totally deficient in vitamin B - no stores at all.
also trace minerals were out of whack.
form memory, we had her on:
a good multivit
vitamin E
evening primrose oil
fish oils
vit B complex
folic acid
and gut probiotics.
we found a lot of improvments - general things, less anxiety, less stims, better absorption of food. also a few bonuses too - more willing to try foods being one.
keep meaning to re-start her, actually, especially the fish oils (and other omegas)
some people have done it by reading up themselves, I prefer to have someone on board leading the whole thing - so we used nutrilink as linked before. very knowledgable, very helpful.
I want to research enzymes more now, and maybe trial dd1 on those (dh - dairy intolerant - uses enzymes successfully if going to a wedding or similar where he doesn't want to make a fuss, and they work well for him)