Young men are being encouraged to undergo testosterone testing and start hormone therapy through Instagram and TikTok content that promotes unproven health claims while downplaying medical risks, a new international study has found.  

Experiencing multiple acute stresses at the same time, as in natural disasters or mass shootings, can leave lasting memory scars. New research from the University of California, Irvine suggests that levels of estrogen in the brain may play a surprising role in this vulnerability, especially for women. The study, published today in Neuron, provides insight into why women are more likely than men to develop post-traumatic stress disorder and face higher dementia risk later in life.