vitamin b complex liquid dosage amount

[aude]

Due to a variety of leg issues, I wanted to try giving my 6 week old chicks vitamin b complex. I have a bottle (liquid w/dropper) that contains: Riboflavin 1.7 mg, niacin 20 mg, vitamin b6 2 mg and vitamin b12 1200 mcg, pantothenic acid 30 mg for a 1 ml serving size.

Would it be best to mix it in with the water or can I just give the drops directly? If so, how many drops should I give per chick? They are about 6-8 ounces in weight.