Shilajit (Sanskrit: शिलाजीत) or Mumijo is a blackish-brown powder or an exudate from high mountain rocks, often found in the Himalayas, Karakoram, Nepal, Bhutan, Girda (Buldhana, MH, India), Russia, Mongolia and in the north of Chile, where it is called Andean Shilajit.
Although shilajit is sometimes referred to as a mineral tar or resin, it is not actually either of those. It is a highly viscous substance like a tar or resin that is very dark brown or black in color, but unlike these is readily soluble in water but insoluble in ethanol. Shilajit is a phytomineral exudate that is composed of 60% to 80% humic substances such as humic and fulvic acids, along with trace oligoelements including selenium .
Some researchers hypothesize that shilajit is produced by the decomposition or humification of latex and resin-bearing plant material from species such as Euphorbia royleana and Trifolium repens over a period of centuries  .
Shilajit is likely relatively safe at doses of 0.2 – 1.0 g/kg body weight when used chronically. There are concerns however that when diluted with chlorinated water, the humic and fulvic acids may potentially react to form toxic dihaloacetonitriles.
The English word Shilajit is a phonetic adaptation of "śilājīt" (Hindi: शिलाजीत), which in turn goes back to Sanskrit (Sanskrit: शिलाजतु, śilājatu). The literal meaning of the Sanskrit compound is "mountain tar", the first element शिला (śilā) meaning "pertaining to, or having the properties of a rock, mountain", the second जातु (jatu) denoting "gum, lac; any tarry substance"
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