Shilajit

Shilajit (a.k.a. mineral pitch) is a black tarry substance that is harvested from the cliffs of the Himalayan mountains of India. Thousands of years ago humans began using it as a medicine and discovered the powerful rejuvenating effects, earning it high regard in the traditional herbal medicine of India (Ayurveda). It is known for improving endurance and vitality, brain health, regulating hormones, and promoting fertility.

Antiepileptic and antipsychotic effect of Shilajit:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4728862/

Shilajit improves the outcome of traumatic brain injury:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3758058/

Shilajit (a.k.a. Mumijo) has potent anti-ulcer activity:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4333629/