The stimulant behind Kennedy’s bursts of energy
John F. Kennedy’s public image suggested remarkable stamina, but his health was far more complicated. He lived with chronic pain and serious medical problems, and he received extensive treatment. Among the doctors who treated him was Max Jacobson, a New York physician later nicknamed “Dr. Feelgood,” who gave Kennedy injections containing stimulants, including amphetamines.
Amphetamines act on the brain and nervous system, increasing alertness and temporarily reducing fatigue. They can make someone feel energetic even when the body is under strain. That short-term lift came with risks: stimulants can disrupt sleep, affect judgment, and make it harder to recognize how exhausted a person really is.
A private treatment with public stakes
Jacobson’s injections were part of a broader, improvised regimen—not a simple, carefully isolated energy treatment. Kennedy also received care for chronic illnesses and pain, and accounts of the precise drugs and their timing are not always consistent. So it is too neat to credit one injection with his performance during any particular political crisis.
The deeper concern was secrecy. The public saw a vigorous president, while the extent of his health problems and treatments remained largely out of view. That gap mattered because a president’s capacity to think clearly and make decisions is a matter of national consequence. The striking point is not that stimulants made Kennedy tireless; it is that a temporary surge of energy could help conceal how much effort—and medical intervention—his apparent stamina required.
