Barberry is safe to take with your sweetish bitters. It should not be taken with anti-biotics.
Take a half teaspoon of barberry three times a day.
The barberry will taste much like cranberry with a citrus twist.
Your sweetish bitters from Gaia contains:
turmeric
gentian
calamus
Milk Thistle Seed
Wild Yam
Cardamom
Fennel Seed
Ginger
Gooseberry
Bitter Orange
Anise
The other 60% of the formula is Pure Vegetable Glycerine, Spring Water, Grain Alcohol USP