I’ve talked to an expert regarding Omega 3 and specifically EPA.
#1 2,513 mg of EPA per day should not be given to a child, it’s way too much.
#2 For 10-13 year olds the amount of EPA should not exceed 1000 mg. Starting from 14 years, you can give them 1,500 mg of EPA.
#3 If your child eats a normal balanced diet and you are considering giving them Omega 3 JUST for ADHD, there is no need to give them full Omega 3 complex (with DHA and the rest). Give them just EPA – 1000 mg for 10-13 year olds, 1,500 mg for older kids – always with food that contains healthy fats.