Shall you use vimeral liquid for love bird?

i have tried using vimeral for my lovebirds, but after few days my lovebirds starts dieing and i month of use of vimeral i have lost 11 birds .

i am not sure whether it was of vimeral or some other thing but vimeral was the only thing which i have added in their diet in that month. Now i have stop using it and from the days i have stop using it none of my birds have died .