‘Traceability is vital’: labs test thousands of unregulated substances amid peptide craze

Experts warn consumers of unknown risks as one lab says about a third of samples fail basic quality checks

My teenage daughter’s OCD keeps getting worse. What can I do?

Cognitive behavioural therapy may help her to cope with her anxiety and learn that she doesn’t need to respond to intrusive thoughts

What are peptides, are they safe and is there evidence to back up the hype?

Influencers and athletes are among those claiming substances can help with injury repair, weight loss and angi-ageing

Medicines watchdog to investigate UK peptide clinics over health claims

Exclusive: Guardian investigation finds several clinics making potentially unlawful claims about benefits of unregulated therapies

Stop the brain rot! 12 ways to stay sharp in a mind-frazzling world

Feel like too much low-quality screen time is making you … dumber? From focusing on your environment to ‘washing’ your brain, experts share tips on how to sharpen up and keep your mind fighting fit

Positive thinking helps you age better? That’s the worst thing I’ve heard all month

If you’re the glass-half-full type, you should be overjoyed at the news coming out of Yale School of Public Health. But pessimists like me? We’re stuffed, writes Emma Beddington

Full network of clitoral nerves mapped out for first time

Anatomy of one of least studied human organs could improve outcomes for women who have pelvic surgery

‘I thought, what the hell have I done?’: the people who moved abroad for love – and regretted it

Emigrating to be with your partner sounds wildly romantic, but what happens when the person is right and the place very much isn’t?

Marriage over, €100,000 down the drain: the AI users whose lives were wrecked by delusion

One minute, Dennis Biesma was playing with a chatbot; the next, he was convinced his sentient friend would make him a fortune. He’s just one of many people who lost control after an AI encounter

‘It all feels very natural’: Britain’s sauna boom heats up as people seek warmth of human connection

Evidence suggests saunas can boost heart health, but their real power may lie in bringing people together in an increasingly digital world