The Diary Of An Immortal (1945-1959) timeless science fiction by David J Castello

The Diary Of An Immortal (1945-1959) timeless science fiction by David J Castello
https://www.amazon.com/Diary-Immortal-1945-1959-David-Castello-ebook/dp/B01LQX2GBU

Inundated by death and destruction, a WWll U.S. Army medic discovers a Nazi immortality formula during the liberation of the Dachau concentration camp. He  begins consuming the formula and traces its origin to a remote monastery in China where he encounters an ancient race of immortals intent on world domination.