Let me just say this....
Can a dragon absorb water through his skin? No, it has to absorb through a mucous membrane like the vent or mouth. So how could vitamins absorb through his skin with any kind of level to actually reach his blood stream and enhance his nutrition.
So, you can spray it on him...might help with shed, might make him wet
....but it isn't going to supplement his nutrition.
This reminds me of a commercial I saw yesterday about a women's skin cream made with some type of medical grade collagen injectible stuff. The collagen/synthetic works and is approved for INJECTION for dermatologists to use. How is it going to help if you smear it on the surface of your face? It isn't....it has to be injected....
Sooooo, all this fancy marketing is usually BS...that is how companies make money. Your logical mind already recognized that this product doesn't really do much and prompted you to ask the question.