Parents have very mixed reviews on the efficacy of natural supplements such as the ones you have mentioned. Generally speaking, with a confirmed diagnosis of ADHD the over the counter supplements tend to have little effect; these supplements tend to work better for children who need a bit of a boost but are not ADHD. This is not to say you can't try it, provided there is no allergy to any of the ingredients.
A better route to follow if you are interested in a natural alternative is to contact a homeopath who can treat your child's specific needs; just as your child's medication and dose were monitored to achieve the best results, the homeopath would need to do the same.
Meditation, as with any alternative therapy, is met with differing views. The greatest challenge with meditation for ADHD is that it requires one to still the mind - which is exactly what a person with ADHD struggles to do. The task of learning to meditate - effectively - is therefore very difficult.
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