Hi LuvNhope, I think the very expensive ginseng can be heaty, so can get the cheaper ones too. I got mine from dr Zou, a small pack about palm size (60-70 slices) for $5. Dr Zou says $60 for 一两 (about 37g) is sufficiently good. I think mine is lower grade hee.... According to her hubby, ginseng is heaty but cordycep isn't and cannot compare both effects, it's like orange has vitamin C whilst red meat has iron...they are all good. Spent a bit of time this morning talking to her hubby about herbs, or rather he was educating me...lol...