While it is certainly a teacher's place to inform you of the difficulties experienced by your son, teachers are not in a position to prescribe Ritalin.
Having said that, what you describe is typical of ADHD: even in the most severe cases of ADHD, children will be able to sit still and concentrate on tasks they enjoy. The reason for this is neurotransmitters are released to sustain our attention when we are enjoying ourselves. When we are bored or do not feel like doing a task, this neurotransmitter is not released; a different one should be released to act as our little inner voice that says "I don't want to do this, but I have to". In ADHD, this neurotransmitter is not released in adequate quantities.
EyeQ and Biostrath are supplements, predominantly high in Omegas (which aid concentration). Whether or not one works better than the other depends entirely on each person and the severity of the symptoms experienced.
In order to determine the best way forward for your son, I suggest seeking an assessment from an educational psychologist or consulting with a psychiatrist or neurologist.
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