All of Nature's Kiss products are 100% pure and undiluted but it is especially important to note with Sandalwood as it is an expensive essential oil and often diluted by other suppliers in order to make it more cost effective. This is pure and undiluted which is why the cost may be higher than when comparing to others. It comes from the wood of Santalum spicatum which is a native tree of Australia. It has a top note which can be considered dry and bitter.