Rich said: Thanks Jessa! I do not use triune formulas for the majority of my clients, but on occasion I do - especially for cases that feel complicated (lots of moving parts), as a way to frame organizing it all into a cohesive whole. At the same time, I have no doubt it deeply shaped how I formulate and is "behind the scenes" all the time, which is something I remember David saying when I took the program twenty plus years ago: that even if you don't formally use it forever, it will provide a foundation for formulating. I very often find myself using a nine herb, 18 part formula, even if I don't formally go through the process! For the first 2-3 years of my practice I did stick to it more strictly and formally.
In terms of teaching, I do introduce my students to it, starting in the beginning of their second year. It is much more an overview and introduction than what David does - I provide a couple of articles on it (one from David), share what I learned from both William LeSassier and David, and use it as a way to frame formulating and think about how to wisely combine herbs. But I also introduce other formulation traditions and concepts, and actually start with herbal pairs, then triads, then work my way up. I might do triune more but I co-tech with two other herbalists who do not use it, so it would also get confusing. You get far more of triunes with David - his class materials for instance which I have always considered proprietary and don't share, etc. I think it will serve you incredibly well. I hope that is a helpful answer!