can you recommend a vitamin which will help with concentration please

[Pwsimerimew]

We've tried various product with no joy - fish oils that taste too fishy, and DS won't take them!
Also, anyone giving kids vitamins with zinc. What works best? Do you buy a multi-vit and a separate omega 3 + 6 supplement?

I've found another post on 1st July with same question,so it's okay, at ease everyone

I don't think there is any evidence to suggest any vitamin can imporve concentration.

I'd like to hear about any that does claim to though.