I wouldn't be worried about, but it's good that you are concerned. In general natural foods and herbs are safe, but of course with anything we can overdo it.
I used to make many batches of herbal teas, with 10 or so different herbs for years. I think it's been for nearly 20 years. The only problem I had is when I took too many anti-mercury supplements. The combination made me very sick.
But I'm always reading about, and I think we should be aware of any complications. For example, I heard that one shouldn't take too much of licorice herb for too many months. But how much is too much? I don't know. So, I just take the cautious route, and only use a tiny pinch of this herb, and sometimes don't use it for weeks. It helps sweeten up the herbal teas.
Since I had trouble with supplements, I try to stay away from them if I can find them in natural foods. For example, I won't use garlic extract (that was one of my anti-mercury components), but rather use raw garlic instead at times.
I had an interesting experiment with bee pollen once. When I first started taking them one time, my heart kept racing when I just finished my run. I was scared and drank water until 4 am until my heart beat finally settled down. It's well-known that bee pollen can cause some reactions like this. But I persisted and slowly reintroduced bee pollen to my diet. I added them to my natural cereals. I guess what I'm saying in summary, is that we should be cautious, but I don't think you have to worry.
Worrying or anxiety often makes things worse. It's a vicious circle when we are sick. We get sick, we worry, the worry makes us more sick, we worry more.... Finally we say, you're fine...stop worrying. I know because I've been there.
I hope that helps.