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About Antioxidants and the Skin


Article by Dr Stefanie Williams

‘Antioxidants’ is one of the biggest buzzwords in skincare these days. I get countless questions about them in clinic every day. There seems to be a lot of confusion about what exactly antioxidants are and how they should be used. So I have summarized the most important facts about antioxidants here:

 

What is an antioxidant?
Antioxidants are substances, which can neutralize free radicals. By neutralising free radicals, they prevent a harmful reaction called the oxidative chain reaction. Antioxidants in skincare therefore reduce ‘oxidative stress’ in the skin, help to prevent damage and thus reduce the risk of premature skin ageing and possibly even skin cancer.

 

What are free radicals & oxidative stress?
Free radicals (‘reactive oxygen species’ – ROS) are highly reactive molecules, which contain at least one unpaired electron. Free radicals thus constantly seek electrons from other molecules and start a chain of oxidative reactions in the skin (‘oxidative chain reaction’). This leads to disruption of normal cell function and damage to our cells, especially when in a high concentration (‘oxidative stress’). Cells might become mutated, defective or killed as a consequence of free radical damage.
Free radicals are generated as by-products from normal cellular metabolism. However, free radicals can be increased in number by sun exposure, smoking, pollution and other internal and external factors.

 

How can free radicals damage our skin?
Free radicals contribute to the skin’s ageing process by damaging lipids, proteins and nucleic acids in our skin. Free radicals also cause inflammation, reduce collagen and elastin production and increase collagen and elastin breakdown in the skin. In addition, free radicals also play a role in skin cancer.

 

How important are antioxidants in the fight against skin ageing?
They play a significant role. There are a variety of mechanisms involved in skin ageing including shortening of DNA telomeres, mutations in mitochondrial DNA with subsequent mitochondrial dysfunction, formation of advanced glycation end products (AGEs) and last but not least free radical damage of lipids, proteins and nucleic acids in our skin.

 

Where are antioxidants present?
Antioxidants are present everywhere in our body. The skin also contains a variety of different antioxidants. Antioxidants can be divided into enzymatic antioxidants such as glutathione and low-molecular weight antioxidants such as vitamin C, vitamin E and ergothionine. Both types of antioxidants are present in our skin.

How do antioxidants work to combat ageing?

Antioxidants help to prevent a number of harmful ageing processes revolving around free radicals. These contribute to the skin’s ageing process by causing inflammation, reducing collagen & elastin production and increasing collagen & elastin breakdown in our skin. Our skin will try to repair the damage, but this might happen sub-optimally, so that with time damage will accumulate and the quality of collagen and elastin fibres will be reduced. This ultimately leads to poorer skin elasticity with development of lines and wrinkles. Using anti-oxidants will reduce the rate at hich this takes place.
How effective are antioxidants in skincare?
That depends largely on the specific product. There are countless factors influencing whether a skincare product really will deliver, but a good antioxidant product should certainly be included in everybody’s daily skincare routine, as a good product will greatly contribute to protecting the skin from premature skin ageing. Some antioxidants work particularly well in concert, as they recycle each other, e.g. vitamin C and E.

 

What other ingredients are important if we want to have youthful looking skin?
Although antioxidants are crucial and should be present in everybody’s daily skincare routine, antioxidants should not be the only active ingredient you use, if you serious about combating skin ageing. A good vitamin A derivative for example (e.g. retinol or retinaldehyde) is also important. And of course you should always use a broadspectrum sun protection moisturizer with SPF 30-50 all year around.

Dr Stefanie Williams

Dr Stefanie Williams is founder and Medical Director at European Dermatology London. She is a fully qualified, GMC registered medical doctor and a Specialist Dermatologist

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