Numi teas are usually very good. This one had a combination of ingredients that I enjoy. Together they are earthy and soothing. I cannot tell if it improves my immune system for sure, but I cannot think it would hurt it at all. Based on the flavour, the quality seems good for a prepared tea bag. Loose leaf teas are the best, but this one is a good quick go to!
The herbs contained in the tea would certainly provide immune support. It is a very clean tasting tea- and seems of high quality. It taste's medicinal, so I would not drink it daily, as I do with Tao of Tea Elderberry. However, I think it would be a potent remedy if I were coming down with something.