I think I found it
the growth aide being Sulfur?
4. What are the ingredients in your product? They are coconut oil, extra virgin olive oil, sulfur powder, essential oils & fragrance. And for the no Sulfur Serum is the same minus the Sulfur Powder. If you are allergic to a specific item e-mail customer service before hand. And with any hair care product you need to do a test patch before full use.
seems pretty safe if there arent any reactions to the sulfur but they have a sulfur free one too, then whats the growth aide in that!
nobody has to answer, just me thinking out loud