This is something everyone has heard of but very few know anything about it. One of the gifts of the magi, myrrh. Before opium came along myrrh was about all they had, along with alcohol and a few other herbs. Myrrh is not only a pain killer but also good for your health. It is an antiseptic, anti-viral, helps with coughs, helps with anxiety and sleep.
I bought some off ebay, its really cheap. I used about .6 gm in my vaporizer along with my usual dose of mj to help with sleep. The effects were very noticable over and above the other. It has a strongly calming effect and an interesting feel. Not sure if I got to sleep any quicker but it was pleasant. It is said to be stimulating while at the same time calming.
It can be eaten, smoked, or vaporized. I think smoking it is the worst way but can be done. Or crush some up and put it in cookie dough and bake a cookie. Or in yogurt, or toss and wash. It is a resin and looks kind of dark
I also have frankincense which I have not tried yet, its even cheaper and is a white yellowish resin. Either of these have many medicinal uses, from a skin cream to mouth wash. If you get some get the solid because the oil is very expensive and does not have quite the same effects.