I really enjoy Na'vi products. They always arrive promptly and well-packed. The quality is always good. My view is that any medicine should be of the highest quality, and from experience lower grade herbs just don't work as well and aren't worth the time or money. Na'vi herbal extracts are concentrated so a little goes a long way. I appreciate that most of their herbs are sustainably wild-harvested; they are closest to nature and from less-polluted areas of the planet, which is another benefit. One simply doesn't want to ingest herbs which contain contaminants like heavy metals etc. This is why I pay a bit more money for peace of mind.