THC-O is made by adding Acetic Anhydride to hemp-derived THC. THC-O flower is hemp flower with a high THC-O content. It can be used to make other THC-O products or used to grind and smoke. At VapeRanger we offer the best THC-O flower for sale from some of the best brands in the world. Register for a wholesale account today to buy THC-O online in bulk at an incredible price.