According to a case report in the Irish Medical Journal, a 33-year-old Irish man tried to get over a chronically bad back by injecting himself with shots of his own semen.
Surprisingly, the semen shots did not cure his pain.
But his self-investigated, self-taught, alternative (natural?) treatment did leave him with a swollen arm and a deep abscess loaded with – surprise – unabsorbed semen (and God only knows what critters hanging about in that free warm semen bath).
Happily, according to the report, his doctors were able to cure this man of his abscess.
I very much doubt, however, that they were able to cure his brain.