I apologise for the English reply. As far as I am aware, Evening Primrose Oil only contains Omegs-6 fatty acids; it is suggested that Omegas-6-9 be taken for those with difficulties with concentration.
Melatonin is a naturally occurring hormone which regulates our sleep cycles. Although a good night's rest is crucial for a child to be able to concentrate, Melatonin does not have any direct affects on concentration.
I hope I have not misunderstood your query; if I have please write again.
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