This command utilizes your healing skill to create a potion.

Commands that apply are:

brew list kits|potions|elixirs|oils|powders|misc
View a list of available brews of specified type.

brew materials POTION
View materials required to create a POTION

brew create POTION | ARG
Create a potion, elixir, oil or powder.

Example:

brew create potion of optic transmogrification | silver
This will create a potion that will change your eye color to silver.