Hi,
I can’t spear to MRH Pau d’Arco. Generally speaking they are a good company but I am pretty sure that is not their top seller so they likely replenish their stock every few years. Pau d’Arco bark is good for about 2 years after harvest, it can still be used after that but it greatly looses its potency. The only brand that was recommended to me when I was going through cancer was https://taheebo-tea.com
They have a ground form that makes a much stronger tea so you don’t have to drink as much. I trust them, that is all they sell so they are 100% focused on quality. Very nice couple, easy to contact. I had questions and had a great chat with the owner! I am 5 years clear and still drink one to two cups per day.