Children and adults with ADHD of ADD do experience a very slight and short loved increase in concentration after caffeine/red bull etc but it is not sustainable. Also there is a risk of caffeine poisoning from over dosing on caffeine. I would not try to self medicate with these items,
Ritalin is fab if understood and used correctly. It's not all bad, doom and gloom as the press would have you believe.
My DS has the same issues as yours (poor concentration, not hyperactive) and a low dose of a slow release ritalin drug has transformed his life since last June. He is not ' drugged to the eyeballs'. Within months of starting the drug, he could articulate to me why prefers taking it to not taking it (given a choice at weekends) as he tells me it "moves the fog in his brain" and "makes school more interesting".
DH was also diagnosed whilst DS was going through diagnosis and has been able to explain to me much of what DS may be feeling and how life is in an ADD/ADHD world.
I held out for 18 months before allowing Ritalin to be tried, using Omega 3 fish oils, which made no difference.
I now feel guilty holding off for 18 months because it has been of such enormous benefit to him, He no longer needs as much extra support, (30 mins a week shared with one other) is doing well in school has better friendships, and is getting more out of life.
- am interested to know your experiment results, but please be careful