Matcha is optional, but I think it's a great addition to this homemade deodorant. Green tea, in the form of matcha powder, has lots of antioxidants, it's anti-inflammatory, and it makes the deodorant a beautiful shade of green! Powders in anhydrous products like this one (something that only uses oils and waxes, and no water) also seem to help with the glide factor and reduce greasiness. All of that said, you most certainly can leave it out of the recipe!