One friend of mine introduced me to a substance called Mumijo. It is a organic black resin that can be tacky and harden like a rock if left uncovered. Found in Altai mountains and apparently this substance has over 80 different minerals. It is also called mountain/rock sweat. I got convinced and decided to try it myself. You can read full post here: https://simpleask.net/forum/diet_food/mumijo-shilajit-mountain-sweat/