herbs are great. from what ive found, you can combine them as much as you like (KEEP IN MIND the recommended dosage however). I take Brahmi daily and have found a 10 point increase in my IQ from taking it daily for 6 months as well as many benefits relating to memory, etc. I take brahmi while I was on the Clarkia tincture without any problems. if you have a look at the humaworm ingredients there is like 30 different herbs. so I would guess it to be safe to combine many herbs at one time for anything you want to use. keep in mind that the Clarkia method itself is just 3 herbs Black-Walnut hulls, clove oil and Wormwood .
If you want, feel free to take other herbs with the parasite cleanse. I am no doctor, but as I said, just keep in mind the recommended dosage for each herb and dont exceed it unless you intentionally want to.
best of luck and feel free to post any other Q's. I will help with my opinions and advice where i can.