Ashwagandha has so many benefits that many herbs books have pages on it. The benefits I posted above were primarily about the nervous system. It is sometimes called Indian ginseng as it is very strengthening to the system, but without some of the irritation or heating that ginseng can cause.
Since I’m basically in the Ayurvedic tradition although I do use some other herbs, I prefer the whole powdered herb rather than extracts, for a few reasons. If the extracts help people, fine; I just prefer the whole thing, as there are micronutrients and other chemical constituents that support or help the herb’s uses. But whatever works.
Several of the KSM 66 formulations contain both the whole powder and the extract in about a 3 to 1 ratio. The one I use has that ratio.