Does The Price of Your Shampoo Affect How Clean Your Hair Is? Here’s The Science
Laura Waters, 26 Jan 17
       

But how much did you spend? Shutterstock

How do you choose which shampoo to buy? Do you take the advice of your hairdresser or believe the adverts you see in magazines or on television? Perhaps you just opt for the brand on special offer in the supermarket? Most importantly, does it make any difference?

The answer completely depends on what you are hoping to achieve. My recent study for BBC Two’s Horizon programme found that in some cases the simple answer is that is doesn’t matter which brand you choose or how much it costs. This is because all shampoos contain similar ingredients to clean your hair. Known as surfactants, they are the same compounds used in many other cleaning products such as washing-up liquid.

These compounds are excellent at removing dirt and grease through their unusual multi-functional nature. At one end of a surfactant, the molecule is hydrophilic, – it is content to be soluble in water – yet at the other end, it is hydrophobic and will attract oil and dirt.


When added to water, the molecules of surfactant spontaneously assemble into a spherical structure that captures any oil-based dirt inside the sphere, helping the grime to leave the surface of the hair. This is perfect for washing hair as the surfactant molecules within the shampoo mix with the water as you wash, then drag the dirt away as you rinse your hair.

If this is their only purpose, then shampoos – whatever they cost – are all the same. This was proven scientifically for the Horizon programme using two PhD students as volunteers who were instructed not to wash their hair for a week.

Samples of unwashed hair were collected and tested by washing in a range of shampoos and then analysed using microscopy to look closely at the surface of the hair to see if any dirt and oil remained. The study found that all samples, regardless of which shampoo was used or how much it cost, were equally clean after washing.

Is there a catch?

The cheapest shampoo (costing about £1 per bottle) left one student with a small static charge on the shafts of their hair, which quickly attracted dirt and dust back onto the surface. In this case, the hair would initially appear clean after washing, but dirt would soon find its way back onto the hair, making it a poor long-term cleanser. This might make it wise to avoid the very cheapest brand. That said, there was no difference between any samples from the mid-range shampoo and the much more expensive shampoo that cost more than £40 per bottle.

Decisions, decisions … Shutterstock

So what’s the point in spending more money on a shampoo if they largely all clean your hair just as effectively? Well, it’s all the other ingredients that you are really paying for, such as fragrances and extra conditioners. The ability to clean your hair, after all, is only part of the overall function of shampoo.

Sign in to view full article

       
Facebook’s New Anti-Fake News Strategy Is Not Going To Work – But Something Else Might
Over the past year, the social media company has been scrutinized for influencing the US presidential election by spreading fake ...
Paul Ralph
Mon, 1 May 17
Young Workers Expect Their Older Colleagues to Get Out of The Way
There are many names for the narratives pitting the older generation against the younger: Gen-Y versus Baby Boomers, “Generation Me” ...
Michael North
Wed, 15 Mar 17
My Smartphone, Myself: Digital Separation Anxiety in The Postmodern World
Has this ever happened to you: you accidentally leave your cell phone at home, and it feels like your soul ...
Abraham Martínez González
Wed, 18 Jan 17
How Hot-Deskers are Made to Feel Like the Homeless People of the Office World
If you work in an open-plan, hot-desking environment, you have probably at some point found yourself trudging through the office, ...
Alison Hirst
Thu, 16 Feb 17
Every Picture Tells A Story, But Visualisation Can Tell The Right One
They say a picture is worth a thousand words.
Quang Vinh Nguyen
Thu, 4 May 17
At Epoch Times, We Care :o)
An Epoch Times Survey
AcuSLIM - Acupuncture Weight Loss Programme
Read about Forced Organ Harvesting
Sports Elements
BUCHERER