Wellness-obsessed influencers are boasting about their over-the-top supplement “stacks.” In some cases, they’re spending over $1,000 a month on capsules, powders and injections that purport to improve sleep, fertility, longevity and more, but often aren’t approved for those purposes. Some are making money from their endorsements.

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Differences in testosterone levels may partly explain why men generally recover faster from pain than women, according to a recent study in the journal Science Immunology.

After getting a ketamine prescription through the telehealth company Better U, Tricia Anne Dewey died last July from accidental intoxication due to the combination of ketamine and Xanax. Her death highlights some of the risks tied to the booming but largely unregulated business of remote ketamine prescriptions.

Eating a lot of ultraprocessed food raises the risk of heart attacks and strokes, according to new research that shows the risks rose with each additional serving a person ate.

A federal judge blocked the Trump administration from implementing its pared-down list of recommended childhood vaccines, which were part of Health and Human Services Secretary Robert F. Kennedy Jr. overhaul of the country’s immunization policies.

If you’re below 40, you should be getting screened for cholesterol and heart attack risks, according to new clinical guidelines, which lower the age by at least a decade at a time when heart attacks are becoming more common in younger adults.

The approximate amount of THC that cannabis flower—the part of the plant typically rolled into a joint and smoked—contained until the early 2000s, said Jodi M. Gilman, director of neuroscience at the Center for Addiction Medicine at Massachusetts General Hospital. Now, many cannabis shops sell products that can contain as much as 90% THC, presenting bigger risks for teens.

• After clearing tumors in mice, Azalea Therapeutics is advancing the dream of in vivo CAR-T therapy. (STAT News)

• Could a blood test predict if you’ll get Alzheimer’s? (The New York Times)

• Evidence suggests the shingles vaccination may lower the risk of dementia, stroke and heart attack. (The Guardian)

The Health newsletter is your weekly guide to all the news that affects your health and well-being. This edition was curated and edited by Conor Grant—send him feedback or questions at conor.grant@wsj.com (if you’re reading this in your inbox, you can just hit reply). Got a tip for us? Here’s how to submit.