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Latest Episodes:

What is lead doing in protein powder? Oct 29, 2025

Show notes

You might’ve seen headlines about high levels of lead being found in common protein supplements.

With these products becoming more popular, the news has some eager gym-goers concerned about what they’re consuming.

Norman and Tegan discuss how these results compare to our historical exposure – from Ancient Rome to Australia in the 1960s.

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Should you be avoiding perfumes and fragrances? Oct 22, 2025

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Once you go looking, you realise there are scents in everything – from skincare to cleaning supplies to candles. And of course, perfume.

Are there any implications to our health from taking in natural and synthetic fragrances from all these products?

Norman and Tegan sniff out the evidence when it comes to scent, and whether we should be worried.

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Should you be flexible enough to touch your toes? Oct 15, 2025

Show notes

Whether you can or not, it feels like a sign of fitness to be able to reach down and touch your toes.

But how important is flexibility when it comes to your physical fitness? Is it a necessary part of healthy ageing?

Norman and Tegan stretch through the evidence on flexibility – when does it count, and how can you achieve it?

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You can listen to more episodes of the What’s That Rash? podcast with presenters Norman Swan and Tegan Taylor on the ABC Listen app (Australia) or wherever you get your podcasts. We answer your questions on everything from TikTok wellness trends to wonder drugs and diet myths.

Butter vs margarine: what's better for you? Oct 08, 2025

Show notes

The battle between butter and margarine has been happening since margarine was invented in the 19th century.

So have we figured out which one is better for your health – butter with its high saturated fat content, or margarine which is an ultra-processed food?

Norman and Tegan unpack the winding history of this debate from its inception to the present day.

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No-poo: why do we shampoo our hair? Oct 01, 2025

Show notes

Do you ever wonder while you’re shampooing and conditioning – is this really necessary?

The no-poo movement encourages people to ditch their products and turn to homemade concoctions, or nothing at all.

Norman and Tegan rinse out the evidence for and against hair care, and how we got here in the first place.

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Is running bad for your knees? Sep 24, 2025

Show notes

It’s marathon season, but whether you’re running 40 kilometres or four you might’ve wondered what it’s doing to your joints.

It used to be thought things like osteoarthritis of the knee or the hip were caused by wear and tear, and running made things worse.

Norman and Tegan jog through how the evidence has evolved, and answer the question: should you be hopping on the run club trend?

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Is loving your pets bad for you? Sep 17, 2025

Show notes

A post from Queensland Health has been ridiculed after for urging people not to kiss their pets or let them sleep in the same bed.

So how do the risks of pet ownership stack up to the presumed benefits of having a furry (feathery or scaly) friend?

Norman and Tegan take a look at the evidence – and some of its flaws – and reignite the age-old cat vs dog debate.

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Checking the pollen count? Here are some hay fever tips Sep 10, 2025

Show notes

It’s hay fever season, and as you sniffle away next to an air purifier, you might be wondering why we haven’t cured such a common allergy.

Allergic rhinitis, as it’s scientifically known, has plagued people for generations. It's thought up to 24 per cent of Australians suffer from it.

Norman and Tegan run through what hay fever is, how we identified it and what can be done to treat it.

This episode first aired on October 23, 2024.

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Is there a cure for jet lag? Sep 03, 2025

Show notes

It’s a tale as old as air travel … you’re off on a whirlwind holiday but spend the first week suffering from fatigue.

If you ask anyone about jet lag they’ll have their own tips, but what are some evidence-based ways to reset your body clock?

Norman and Tegan talk through some of the ways you can adjust to a totally different timezone.

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Don’t Die: Is Bryan Johnson going to live forever? Aug 27, 2025

Show notes

If you haven’t heard of the Don’t Die movement or Bryan Johnson’s Blueprint Protocol, then buckle in.

Johnson is a millionaire who is pouring his money into a massive effort to stay as young as possible, for as long as possible.

Norman and Tegan unpack the basics of his routine, and some of his whackier attempts to turn back the biological clock.

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