adding all that shit isn't going to be a good idea. you can pick up ferts for super cheap. fish emulsion 7$ good nitrogen source. OR blood meal 8$ bone meal =8$ its not much and it will actually benefit the plant.
Synthetic ferts arn't much either, if you just buy the basics. for 60$ i got enough grow, micro and bloom to mix over 2000 liters of it

I dont know the specifics about the vits you talk of. but i know that for a plant to absorb say phosphorus it needs to be in an available form. So humans (which the pill is intended for) may need a different form that is unavailable for the plant or toxic for the plant.

More to the point you are guessing about the amounts and it could kill them. I wouldn't do it.
harris7 Reviewed by harris7 on . make your own fert could i mix crushed egg shells, crushed kidney beans and banana slices together into the soil it give it a good NPK? Rating: 5