Woman holding green appleWe know fruit and vegetables are good for our skin, giving us that sought-after healthy glow.

But there is an apple, a sour, rare apple living in a remote part of Switzerland, that is being touted as the new wrinkle-banishing ingredient.

Now, we know as well as anybody that 'miracle' wrinkle creams are ten a penny these days, but this particular fruit is at the centre of a 'revolution' in anti-ageing.

The science behind the theory is that this particular apple (rather unromantically named the Uttwiler Spatlauber) is a particularly long lasting variety.

Which led scientists to investigate the possibility of using plant stem cells to rejuvenate our own human skin stem cells.

Swiss scientists, in a paper published in the Journal of Applied Sciences, noted "These apples must have especially long-living tissue stem cells. Could we profit from these stem cells?

"What would be the effect of an extract of such long-living stem cells on the skin?"

Well, apparently a human stem cell production boost of an astonishing 80 per cent.

Which is why cosmetics companies have been queuing up to get their hands on the stuff.

Typically though, it doesn't come cheap. Emerge Swiss Apple Stem Cell Serum, which claims to "promote the self-renewal capacity of the skin" retails online for £72 while Clark's Botanicals Cellular Lifting Serum sells for a whopping £355 for just 30ml.

That's all very well for the likes of Gwyneth Paltrow and Julianne Moore, but for now it looks the rest of us may have to make do with the odd Granny Smith.