Chamomile tea should be fine. I think the problem is taking high doses of supplements. I don't think there's any proof that these supplements delay healing. They can cause setbacks tho. At the end of the day some people drink alcohol throughout and heal. I just thought it was an interesting thread, for those who want to play it safe. I wouldn't take it as gospel.
Just take it slow with any supplements. If you want to have a chamomile tea, try it. There are actually many health benefits of chamomile.
I think it's a good thing to be aware that setbacks can happen and be careful with these things. But fearing everything isn't helping recovery either, I think it creates a negative loop that we can easily get stuck in.
Deanna, enjoy that tea. I would be amazed if it causes you a setback at 20 months. If you're worried, have a few sips. Then next time 1/4 cup etc etc