I was very happy that Birch Boys has brought cordyceps back into their product lineup. I've been trying cordyceps tinctures from many vendors/herbalists and can report, based on the way they've all made me feel that Birch Boys product is equal to the best of them, and better than most of them in terms of providing lots of good, clean psycho-physiological energy. So, one more tincture added to my Birch Boys ongoing purchase list!