The UGT enzyme (that people with Gilbert’s Syndrome don’t have so much of) works in one particular part of your liver and is responsible for the part (or pathway) of your liver’s processing called ‘glucuronidation’. Glucuronidation happens when toxins are bound to glucuronic acid which is produced by the liver. Chemicals processed by glucuronidation include common opiate based drugs used in pain relief or during surgery (Liston, H.; Markowitz, J.; Devane, C. (2001). “Drug glucuronidation in clinical psychopharmacology”. Journal of clinical psychopharmacology). Other things that affect glucuronidation include smoking, obesity, age and gender.
You can find a list of drugs affected here: https://en.wikipedia.org/wiki/Glucuronidation#General_influencing_factors
Some herbal supplements may help glucuronidation (Effects of herbal supplements on drug glucuronidation. Review of clinical, animal, and in vitro studies. March 2011 Mohamed ME, Frye RF.Department of Pharmacotherapy and Translational Research, College of Pharmacy, University of Florida, Gainesville, Florida 32610, USA.)The use of herbal supplements has increased steadily over the last decade. Recent surveys show that many people who take herbal supplements also take prescription and nonprescription drugs, increasing the risk for potential herb-drug interactions. In vitro and animal studies indicate that cranberry, gingko biloba, grape seed, green tea, hawthorn, milk thistle, noni, soy, St. John’s wort, and valerian are rich in phytochemicals that can modulate UGT enzymes. However, the IN VIVO consequences of these interactions are not well understood. Only three clinical studies have investigated the effects of herbal supplements on drugs cleared primarily through UGT enzymes. The need for further research to determine the clinical consequences of the described interactions is highlighted.
Essential for Glucuronidation are the nutrients L-glutamine, aspartic acid, iron, magnesium, B3 (niacin) and B6. Thyroid should also be adequate. Cruciferous vegetables (cauliflower, cabbage, cress, bok choy, broccoli and similar green leaf vegetables) are helpful. Glucuronidation efficiency can be improved by calcium-d-glucarate. However, you have to start very gradually with the calcium-d-glucarate, and be very consistent.
You can find out more about glucuronidation here https://youarethehealer.org/health-conditions/optizmize-your-health/detox-biotransformation-pathways/glucuronidation/