‘They’ve invented a spurious pseudo-disease’: why are so many men being told they have low testosterone?

Social media influencers and booming men’s health companies are pushing the hormone as an answer to all ills. But is ‘low T’ really problematic – or something created to sell men a cure to a problem they don’t have?

‘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

Trying to conceive? Welcome to the worry-filled world of ‘trimester zero’

An army of ‘pregnancy prep’ influencers is offering would-be parents everything from sensible advice to quackery and questionable supplements. What’s really needed?

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

Full-blown agony: my battle against the mysterious pain of cluster headaches

They can hurt more than broken bones or pancreatitis. But with the right drugs and therapies, relief is possible from this debilitating and often misunderstood condition

New antibiotics hailed as ‘turning point’ in treating drug-resistant gonorrhoea

First new treatments for sexually transmitted disease in decades approved by US Food and Drug Administration as number of cases worldwide surge to 82m

She was pregnant and addicted to fentanyl. Getting to keep her baby saved them both

A baby is born in withdrawal every 18 minutes in the US, and most end up in foster care. At centers like Maddie’s Place, mothers stay with their infants – and leave together, in recovery

‘The pressure to get your old body back is immense’: the new mothers driven to weight-loss jabs

The NHS warns against using GLP-1s while breastfeeding – for the baby’s sake as well as the mother’s. But how much does that count when they’re so readily available and there’s so much pressure to ‘bounce back’?

‘I needed to be locked up’: how Kavana went from 90s pop stardom to smoking crack in a skip – and bounced back

He was a teen singer with his dream career. But then his life fell apart. Anthony Kavanagh talks about sex work, addiction and the years he spent being forced to hide his sexuality

‘I feel like a drug dealer’: the parents using black-market melatonin to help their children sleep

Desperate dads meet in car parks to exchange packets; exhausted parents slip it into their kids’ drinks; families waiting months for prescriptions buy it ‘off label’. But is it worth the risk?

‘I lost so much weight, my husband thought I was terminally ill’: why do people lie about taking Ozempic?

The dramatic results of weight-loss drugs often come with a side order of stigma, as though it’s ‘cheating’ not to stick to willpower, diet and exercise alone. Is that why so many are telling no one – not even their partners?

The end of WeightWatchers? How the dieting club lost out to slimming drugs

As the global enterprise grapples with reported debts of $1.4bn, its calorie-counting formula may have had its day

Hay fever making your life a misery? Try these 20 tips from doctors and allergy experts

Do nasal sprays work? Which are the best antihistamines? Can honey help? What about a shower? We’ve got all the answers