I used it when I was growing out babies. I felt a lot better feeding them mostly brine/mysis shrimp because I felt that the vitamins helped them be healthy and grow more quickly.
I'd put approximately 3 drops per cube of frozen mysis or bloodworms or whatever, and usually mix in a little dry food (freeze dried or pelleted) to make a sort of mushy babyfood.
Great for feeding, but will dirty up your water if it's a small tank without a ton of filtration.