The Wheel of Time rulebook mentions several items made by healers, Wisdoms, and herbalists, but doesn't provide rules on how to make them. A few items also made by these types of craftspeople are also mentioned in this book.

Making balms, antitoxins, and poisons requires the Craft (herbalism) skill. This variant of the Craft skill cannot be used untrained; only characters with actual ranks in Craft (herbalism) can attempt to make these items. A healer's kit constitutes the appropriate artisan's tools for use of Craft (herbalism).

Use the rules as outlined under the Craft skill, in Chapter 4 of The Wheel of Time Roleplaying Game. The DCs for making items varies depending on the item in question.