I read that many people on this board have asthma, which I personally believe is caused by untreated allergies. If you have any allergies, especially to pollen (allergic rhinitis), stay away from chamomile. The flowers are in the same family as asters/daisies/mums/ragweed.
Read the following and scroll all the way down to see possible allergic reactions.
MedlinePlus Herbs and Supplements: Chamomile (Matricaria recutita, Chamaemelum nobile)
I just bought a new brand of DGL licorice and on the bottle it warned that anyone with liver or kidney disease should not use it. Thought I should post it for your information. It didn't say this on the first bottle I purchased.
We all have to be careful about using new herbs and supplements, they can have allergic reactions and cause more problems than we already have.