Sunscreen 101

Sunday, 5 November 2017

As the sun is responsible for up to 80% of all skin ageing, dermatologists and aesthetic doctors’ one most important anti-ageing tip is to protect your skin against the damaging rays of the sun.

Visible signs of ageing from sun damage can appear as early as your twenties, but generally it is only later on that the real damage comes to the surface. The more diligent you are protecting your skin, the better your chances are of looking younger for longer.

Selecting a good sunscreen can, however, be very confusing. Perhaps a good place to start is to know what you’re protecting yourself against. The sunlight that reaches us is made up of two harmful rays – UVA and UVB.

UVA rays (long wave ultraviolet A) penetrate into the deeper layer of the skin. UVB rays (short wave ultraviolet B) are responsible for the topical burning of the skin. It is important that the sun protection we use protects the skin against both rays, as both are damaging to the skin. This is known as broad-spectrum sunscreens.

The two types of sunscreen that can protect the skin against UVA and UVB are known as physical and chemical sunscreens.

Physical sunscreens form a protective layer (or physical shield) on the skin and block or reflect the sun’s rays whereas chemical sunscreens absorb the sun’s rays and neutralise them.

Undesirable sunburn sometimes occurs despite sunscreen application. The reason is because most people don’t apply enough.

To achieve the Sun Protection Factor (SPF – which protects against the sun’s UVB radiation) reflected on a bottle of sunscreen, approximately two milligrams of sunscreen per square centimeter of skin should be applied. In practice, this means applying the equivalent of a shot glass (two tablespoons) of sunscreen to the exposed areas of the face and body – a R5 coin-sized dollop to the face alone.

Using a higher SPF does not mean a full day’s pass in the sun. Use an SPF between 30 and 50 and reapply often because sunscreen chemicals break apart in the sun, wash off and rub off on towels and clothing.

Avoid the chemical oxybenzone – a synthetic estrogen that penetrates the skin and contaminates the body – when buying sunscreens. Look instead for active ingredients such as zinc, titanium, avobenzone or Mexoryl SX. These substances protect skin from harmful UVA radiation and remain on the skin, with little if any penetrating into the body. The downside is if you have dark skin, these minerals do leave you looking grey or pasty. The other option is organic filters, which also work very well, but these do tend to need more regular re-application.

The truth of the matter is that you have to use the product that is best suited to your needs. So it’s certainly not that one form of SPF is necessarily “better” than another. It all depends on what you need.

For example, a gel is preferable for someone with an oily skin.

Mineral powders work great for people who wear make-up as it’s very easy and convenient to re-apply a powder right over your make up as needed throughout the day. Mineral powders are also great for patients with oily skin who don’t want a cream or a lotion feeling on their skin.

And for those people with dry or dehydrated skins, the lotions and creams will always be the favourites as it also makes the skin feel more comfortable.
While there is no such thing as a total sun-block, ultimately one should select protection with UVA and UVB protection (broad spectrum), a high SPF, long-lasting protection and ingredients that pose fewer health concerns when absorbed by the body.

An oral anti-oxidant supplement such as Ovelle or Heliocare daily offers further protection against the sun, but it’s always advisable to use these in conjunction with a topical product. It is clinically proven that these supplements raise your level of resistance to the sun and also help to reduce the melanin content in the skin down the line. Pills are very handy when you know you’re going to be having excessive sun exposure, for example if you’re going to have a beach holiday or if you’re riding a long bike race or running a marathon where it isn’t always easy for you to re-apply a topical but it’s easy to take tabs.

For a selection of sunscreens that meets these criterias, visit Skin Renewal’s Online Skin Shop on

Have a question for our experts? Ask them here.

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Tell your friends

    Sunscreen is expensive. But it is a must. I wish every moisturiser had sunscreen. I always get a bad acne breakout after I apply sunscreen. But I’d rather protect my skin.

    1 year ago •

  1. TamIam Cole

    I love my sunscreen even though Im a vampire. Unfortunately alot of facial sunscreens clog my pores.

    2 years ago •

  1. Melandi Booyens

    This is one tip you will hear over and over and over again, because it is so true, so important and yet everyone ignores it

    2 years ago •

  1. Shabnum Moosa Hoosan

    Sunscreen is a must especially in this weather

    2 years ago •

  1. Chandni Jivan

    I think we should use sun screen on a daily basis.. with our temperatures increasing, it’s causing damage to our skins much more rapidly

    2 years ago •

  1. Khenz Mabunda

    Thank you for such knowledge. I was wondering which sunscreen would work for me. Got the answer right!

    2 years ago •


    I use SPF40. I always forget to reapply though.

    2 years ago •

  1. Fana_kw Karani-wookey

    Sunscreen should be on every beauty’s priority list. Also it’s a great idea to start getting other family members in the habit of applying sunscreen no matter what season it is.

    2 years ago •

  1. Sandra Phoma

    One tip I stumbled upon, it the importance of wearing sunscreen when indoors. Most of our windows do not effectively support us from the effect of sun damage. Please get informed as much as you can about this little fact.

    2 years ago •

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