For people with candida, there aren't too many kinds of teas we can have because of the "sugar factor" that must be considered in teas with flowers and the huge array of additives, particularly citric acid, including as an ingredient. Maybe some people don't have that concern but I've had to eliminate ALL sugars, sweeteners and additives to control the candida fungus, which has raged and still easily gets activated especially in the thyroid and lung regions of my GI tract. If I have a little sugar or dustiness, those regions are the first to react — tightness, phlegm, a dry cough — basically, no fun.
Dry loose leaf herbs aren't the best option either as many herbs sold in US markets have been irradiated to give them longer shelf life. Ugh! Anyway, teas that I enjoy in dry leaf form are of course peppermint, rosemary, fennel (a bit like licorice), and then of course freshly grated ginger for a powerful shot of vigor! Licorice root also ground into powder is very good too but should not be drunk for more than a week at a time as it raises blood pressure, and people with high blood pressure probably should limit their intake to the seldom cup. That said though, licorice root tea is excellent for soothing a raging sore throat and calming down active candida in the mouth and throat region!!! The link (herb-info.com) where the article below comes from is filled with more resources of herbs and their selection.
The effects of leaching from teabag material to the tea are of course avoidable if you use loose leaf tea. If you are concerned about this but still want your favorite brand, you could also try this “hack”: Empty the contents of the teabag(s) into a teapot and brew tea the traditional way with a tea strainer! (You get style points also for that – and let us know if you notice a difference in flavor from the deduction of anything that should not have been in your tea!)
Not only do you have no true idea what the source actually was (you might be allergic to it!), nor how much processing was done to it – but some of the items that are used as natural flavors are completely disgusting in their own right. Like for example http://en.wikipedia.org/wiki/castoreum. Yes, anything that says “natural flavors” on the label could contain castoreum, and you would never know…