How long before natural ADHD remedies start to work?

My 7 year old son shows the classic ADHD symptoms and I started him on Sea Buddies Concentrate yesterday (minimum dosage). He is a big boy, so I am sure we will need to give him more that the recommended starting dosage (you may give up to 10). We have also started him on DHA. How long should it be before I start to notice a change? And is there something better than Concentrate? What about Focus Factor?

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