Usual Gaia high quality that has their tracking and transparency system on the box. It contains all parts of the plants, specifying the root, seed, aerial (leaves) plus extracts from the root with specified Alkylamides amount. No other I've seen has this broken down and measured. FYI if you want to know more, there's the Journal of Biological Chemistry (JCB), Volume 281, ISSUE 20, P14192-14206, May 2006, paper titled "Alkylamides from Echinacea Are a New Class of Cannabinomimetics - CANNABINOID TYPE 2 RECEPTOR-DEPENDENT AND -INDEPENDENT IMMUNOMODULATORY EFFECTS* You do have to take quite a lot of it, as per suggested, so a bottle does not last very long at all. But then again, it should not be taken regularly anyways, only when needed.
I always recommend this brand because it uses the best quality ingredients, the product comes in glass packaging and they don't use too many additives. In terms of herbal supplements, Gaia Herbs offers excellent products. Otherwise, everyone knows the benefits of echinacea. The capsules are of medium size without any taste.