Any help with vitamins please

Is anybody else using this ? I've always used abidec and just realised not long ago that the pink box is for over 1 so I've switched but it says 10ml and it's a lot compared to the 0.6 ml he was having. It's just taking so so much longer and so much encouragement for him to take it, and after the first bit, he doesn't want anymore . He's only on 2 bottles a day morning and night, which adds up to 13 to 16 oz a day depending hownqell hes eaten . What is everyone else doing for vitamins? Thankyou