Yes, plants do have a need for vitamins.
It is a small contribution to the overall health of the tree, where
the major nutrients are the well-known NPK. But also microorganisms,
and vitamins are a part of the palette of foods for plants. As well as
the Mykhorriza fungi has influenze of the health of Pines and maybe
other species.

Vitamins can be added very simple, and the only vitamin of importance,
is the B-vitamin.
It is easily taken by the leaves and can be sprinkled on. Take a low
alcoholic beer, and blend it with water 1:1. It is as simple as that.
There are plenty of B-vitamins in a beer, and this is a good old trick
used to add vitamins to orchids, wich are in need of these vitamins.
But it is also a very good solution for bonsais as well.
Remember to keep a beer for your self. Also humans needs B-vitamins!

And now to the Superthrive question. You will only find out the real
effect of this, by making your own experiences. I newer use it. The
beer does it for me. I use the 1:1 beer and water blend, every time I
spray leaves with water, for the first month after transplanting a
bonsai. And that is two or tree times a week fo a month or so.
In daily care, I use it frequently, in a milder blend.
Especially Pines are good at taking up nutrients true their leaves,
but it won´t harm any plants, but only do good.