Was President John F. Kennedy a methamphetamine addict? The authors of a new book an about unorthodox German-born doctor-to-the-stars say yes.

In Dr. Feelgood: The Shocking Story of the Doctor Who May Have Changed History by Treating and Drugging JFK, Marilyn, Elvis, and Other Prominent Figures, authors Richard A. Lertzman and William J. Birnes say Max Jacobson, codenamed Dr Feelgood by the president's secret service detail for his powerful energy tonic, was a crank who got rich and powerful people including Ingrid Bergman, Mickey Mantle and Nelson Rockefeller hooked on his concoction, which was mostly a combination of methamphetamine and blood from goats and sheep.

Born in 1900 to a Jewish family and raised in Berlin, Jacobson started working with psychotropic cocktails in the 1930s, when he would consult with Swiss psychiatrist Carl Jung, whose guidance "led him to first experiment with early psychotropic, or mood and mind-altering, drugs," the book says.

Jacobson experimented on "animals, patients and himself," and "looked for ways he could mix early mind-altering drugs with vitamins, enzymes, animal placentas and small amounts of hormones." He believed these drugs could not only cure disease, but could "effect remedies on a cellular level."

The doctor said his tonics were provided to the Nazi regime and claimed Adolf Hitler became addicted to his energy-boosting formula.
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