I've dosed a couple varieties of amino's. [salifert, zeo]
When I didn't feed my fish much/often, IMO it was a handy way to provide some sort of nutrient to the tank, when it seemed hungry. [pale zoox coloration, pale non-zoox coloration]
But I've not stuck to any product I've tried yet, just wasn't convinced after adding, discontinuing after a number of months, then adding again that it had enough influence to spend money a second time on it.
Then again, I use a lot of stuff in my DIY fish food, perhaps it has `enough' already.