THC bath bombs work through their interaction with your skin. The skin is the largest organ in the body, and it maintains a barrier between your cells and the outside world.

But this barrier isn’t impenetrable; it’s composed of layers of cells that compounds and substances can penetrate. Underneath all the layers of skin on your body lies your circulatory system, which you can target with cannabinoids.

Bath bombs work similarly to THC or CBD-infused massage oils or topical patches, where cannabinoids are absorbed through your skin. Typically, consuming cannabinoids through the skin produces what some would call a “body high” and not so much a psychoactive experience.

The method of delivery into your body achieved by bathing in a bath with infused bath bombs is called “percutaneous absorption,” which is a form of passive diffusion. This delivers the compound into your bloodstream, but it’s not the most efficient way of getting it there. However, if the compound is highly concentrated within the bath bomb and your skin is ready to absorb it, THC and CBD within the bath bomb can make their way into your circulatory system.