I think, from what I have read it does build up, but still you should notice some difference right away. Tho herbs seem a little more individual than the meds, maybe because they are not as strong.

Lavander does nothing for my anxiety, chamomile does not make me sleepy. Catnip does tho.

I went to the store having an anxiety attack and sniffed all the anxiety ones, the bach rescue remedy, and nothing. Didn't help at all. I even dabbed some under my nose and wrists. But maybe if I would have ingested something might have helped more. Maybe it wasn't potent enough.

Not trying to discourage, I have read great things about valerian. And it does seem to help me. I do feel calm after I drink it and give it some time. But it is more subtle then sleeping pills.