Frankincense is a resin before it is an oil, and Boswellia serrata smells like it: green and peppery on top of the warm balsamic base people expect from incense. It is the Indian species, and the more affordable of the frankincenses Plant Therapy sells, which is why it is the one most blenders actually use rather than save.

Two to three drops per 100 mL of water is the maker's diffusion rate, and it holds its own under citrus rather than disappearing beneath it. On skin the cap is 3 percent in a carrier, stated on the bottle itself. The ingredient line reads Boswellia Serrata (Frankincense) Oil and nothing else. It carries Plant Therapy's KidSafe and Pup and Pony Safe designations, and keeps two to three years.