There are different grades of chamomile and all store bought chamomile is not the same. The flowers don’t fit well into a flat tea bag so buying loose chamomile is better. If you are buying in tea bags, you want more of the white petals than the sticks and stems. Open them up and take a look inside.
If you open the bag you may not even find a single chamomile flower. Most of these are just the dust and fannings of the real thing and have been sitting in a warehouse and on store shelves for months or even years.
The key to getting the desired effects from your chamomile tea is to buy real chamomile, including the whole flowers, and to buy it fresh. I love the chamomile from Adagio Tea. They have a very high-quality herbal chamomile tea. A higher grade chamomile will have a taste reminiscent of apple or honey.