National Geographic | Mind, Body, Wonder

This week: What you should know about collagen supplements; when we'll get a Lyme disease vaccine; a cheap, generic drug that might solve a lot of problems; cancer in the Middle Ages; how to keep your brain sharp.

PHOTOGRAPH BY GIANLUCA COLLA, NAT GEO IMAGE COLLECTION

Do collagen supplements really work?

Collagen production is vital for the health of our hair, nails, bones, joints, and other parts of the body—but as we age, our bodies produce less of it. Now, consumers are spending some $2 billion a year on collagen supplements—but are those popular supplements worth the money?

HERE'S WHAT DOCTORS SAY

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PHOTOGRAPH BY SCIENCE PHOTO LIBRARY

How magnesium affects your sleep and anxiety

The essential mineral is important for the body—but it doesn’t work miracles. Here’s what the experts say about magnesium’s powers.

WHAT DOES IT REALLY DO?

The truth about popular supplements:

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What's in melatonin—and is it giving you nightmares?

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Are 'immune-boosting' supplements worth it?

MICROGRAPH BY ALFRED PASIEKA, SCIENCE PHOTO LIBRARY

Lyme disease is spreading fast—but a vaccine may be on the way

Half of all Americans now live on tick-infested territory as the pests move north, south, and west—to places they've never been before. Thankfully, several vaccines and new treatments are in the works. Here's what you need to know about tick bites and your risk of infection—and how long we might have to wait for a vaccine.

'EPIDEMIC PROPORTIONS': Why tick-borne diseases have skyrocketed +

WHAT DOES AN OVERDOSE DRUG HAVE TO DO WITH COVID?

IMAGE BY PHILIPPE PSAILA, SCIENCE PHOTO LIBRARY

Low-dose naltrexone is often used to treat chronic pain and autoimmune disorders. Now, for many struggling with debilitating post-COVID symptoms, it's one of the few treatments that works: "I have a feeling we’ve only scratched the surface of what this drug can do."

A MIRACLE DRUG?

DIAGNOSING LONG COVID: How do you know if you have it? +

WAS CANCER LESS COMMON IN THE MIDDLE AGES?

ART VIA WERNER FORMAN ARCHIVE, BRIDGEMAN IMAGES

Today, more than half of all Britons are expected to receive a cancer diagnosis within their lifetime. Archaeological evidence from earlier eras, however, has long implied that before tobacco and factories, the cancer rate was around 1 percent. That number, though, may have been a gross miscalculation.

MISCALCULATION?

WHAT DOES CANCER SMELL LIKE? These animals can sniff it out +

HEALTH NEWS YOU MIGHT HAVE MISSED

PHOTOGRAPH BY LU WEI, VCG/GETTY IMAGES

Like a car that gets regular oil changes and routine maintenance, the easiest way to have a healthy brain in middle age and beyond is to follow good physical and mental habits. The good news is, it's never too late to change your habits and improve your brain function—and it could be the key to a longer life.

Hot outside? Here's why taking an ice-cold plunge could be deadly

Should you drink chocolate milk after a workout?

These foods can help you fight off everyday stress

Are you a 'lark' or an 'owl'? Your body clock holds the answer.

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