Hi Lauren,
In an attempt to give Steve a hand on this heavy inquiry day, this is what his response has been in the past:
"That note was included in the text at Susan Wynn's behest, who heard it from Dr. Xie of Chi Institute fame. It doesn't appear to be based on any scientific research. Indeed, if you look up Bupleurum in the medical literature (e.g. pubmed), you'll find the opposite - namely 30 or 40 studies lauding its benefits in liver disease.
Myself, I would have to side with the scientific literature. I've never seen it cause liver disease. Any formula can aggravate liver disease, I believe, if it induces the wrong hemodynamic (e.g. brings blood to an acutely inflammed liver). But apart from this general impact which any formula could have, we haven't seen the slightest potential for problem with the use of Xiao Chai Hu Tang in liver disease."
To add to that,
I have used this long term myself in many cancer patients and have not had any trouble with liver toxicity to date. However, generally the patients I will use it in have wiry pulses and active GB points. Tongue on these guys can be quite variable. You should be okay in these cases, unless you have extremely high liver enzymes or Damp Heat signs which might indicate that something like Si Miao San might be a better choice, or at least part of the treatment, as Steve mentioned above.
Xiao Chai Hu Tang has actually been shown to be hepatoprotective and increases bile secretion. Additionally, clinical indications for this formula include hepatitis, hepatic fibrosis, cholecystitis, and hepatic carcinoma. I always monitor bloodwork on my liver disease patients, and this will give you further assurance that you are having the desired effect.
Erin