sunscreens

In an earlier article, I had talked about the importance of wearing sunscreens on a daily basis.

Honestly, if you only cleanse your face properly and wear a sunscreen daily, your skin will actually be in a very healthy state.

Whether you know it or not, the sun really deals very harshly with our skin on a daily basis, never minding the fact that most of our skincare ingredients also contain photosensitive ingredients that further increase the chances of damage to the skin by the sun on a daily basis.

So it is indeed a wise decision to consider wearing some form of sun protection to avoid such damaging effects from the sun on our skins.

It is also a fact, that dark skinned people are not immune to the damaging effects of the suns ray to our skin.

Therefore the question is no longer why should I wear a sunscreen?, but rather what type of sunscreen should I consider?

 

howsunskin-what you need to know about sunscreens postTypes of sunscreen

  • Physical sunscreen
  • Chemical sunscreen

 

Physical Sunscreen

There are two types of physical sunscreen… Zinc oxide and titanium oxide. These are called physical sunscreens because they block the sun rays from reaching the skin by reflecting them away from the skin surface, thereby preventing any damage to the skin.

In the past these natural sunscreens had the reputation of making people look pasty white after application, however, there are now micronized zinc oxide and titanium oxide particles which are not as whitening as the former non micronized ones (non nano zinc oxide) which  are usually sold under the trade name Zinclear.

Formulating with zinc oxide can be quite tricky as zinc oxide particles tend to form aggloromates which might affect its ability to provide proper protection for the skin. This can however be overcome by purchasing pre mixed/ dispersed zinc oxide/titanium oxide solutions or using very high shear mixers in the laboratory to properly and evenly disperse the zinc oxide pigments.

 

Chemical Sunscreens

These type of sunscreens work by absorbing the UV rays from the sun thereby preventing it from reaching the skin and causing any skin damage.

They are less whitening and most are easy to incorporate into sun screen formulations. Some of the commonly used ones include aminobenzoic acid, avobenzone, homosalate, octinoxate etc

Currently, 17 active sunscreen ingredients are approved by the FDA. The most recently approved ingredient is ecamsule (Mexoryl SX), approved in 2006. The FDA provides the approved concentration of each ingredient, and this often is included on the product’s label.

Here is a list of sunscreens and the type of UV ray they shield the skin from as well as the maximum concentration you can have in a product.

 

 

Active Ingredient / UV Filter Name Maximum FDA-approved Concentration, % Range of Protection
Aminobenzoic acid

15

UVB

Avobenzone

3

UVA1

Cinoxate

3

UVB

Dioxybenzone

3

UVB, UVA2

Ecamsule (Mexoryl SX)

3

UVA2

Ensulizole (Phenylbenzimidazole Sulfonic Acid)

4

UVB

Homosalate

15

UVB

Meradimate (Menthyl Anthranilate)

5

UVA2

Octocrylene

10

UVB

Octinoxate (Octyl Methoxycinnamate)

7.5

UVB

Octisalate (Octyl Salicylate)

5

UVB

Oxybenzone

6

UVB, UVA2

Padimate O

8

UVB

Sulisobenzone

10

UVB, UVA2

Titanium dioxide

25

Inorganic/Physical
(UVB, UVA2)

Trolamine salicylate

12

UVB

Zinc oxide

25

Inorganic/Physical
(UVB, UVA2, UVA1)

 

 

Join me tomorrow as we discuss more on how to choose the best sunscreen for you!

 

 

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