Saw it on Reddit
https://www.reddit.c..._taking_herbal/
Just wanted to bring this up as I have never seen this discussed - ALWAYS google "(insert herb here) liver enzyme"/"(insert herb here) CYP). A ton of herbs have an effect (on their own not harmful) on various enzymes in the liver, and some of these enzymes are involved in the metabolism of popular drugs like caffeine, alcohol, or amphetamine derivatives.
The result of this, is that some herbal supplements may increase OR decrease the half life of caffeine and other drugs. Particularly when it comes to increasing you should be aware because it can result in caffeine affecting your sleep quality or increase side-effects such as feeling hyperstimulated throughout the day, etc.
Even more potentially risky, inhibiting certain liver enzymes might increase the toxic or carcinogenic potential of some substances due to prolonging or completely inhibiting the metabolism of certain toxic by-products. For this reason it is not a good idea to take piles of supplements all affecting different enzymes - so this might mean not having 4+ different herbs on the go at the same time, at least not without good research into this side of things.
Food for thought! Might be wise to form a sidebar list with popular herbal supplements cross referenced against drug-enzymes affected.