By reading the written texts related to sunscreen labels, you might have come across zinc oxide in effective sunscreens. You might have seen it mentioned in the recommendations by dermatologists, in the formulas that are safe for coral reefs, and in mineral sunscreens recommended for sensitive skin types. However, do you really know how it is different and why its information is so frequently mentioned when it comes to the SPF protection from different types of ultraviolet rays?
If we have to be brief, zinc oxide is among the few sunscreen ingredients that effectively protect against the entire UV spectrum. At SunKiss, we believe in helping people make informed skincare choices for effective sun protection. This article explores how zinc oxide works, why it is particularly important in the UAE’s sunny climate, and the key features to look for when choosing a zinc oxide sunscreen.
What Is UV Radiation, and Why Does It Matter?
Okay, so let's first understand what we are actually dealing with here, because not all sunlight works the same way on your skin.
There are two forms of UV radiation relevant for protection purposes. UVB rays cause sunburns as they affect the outer layers of your skin, and hence are the main concern for skin cancer risks due to sun exposure. The SPF number? It refers only to UVB radiation.
Now, UVA rays are a different story. They go deeper, they don't burn you, and that is exactly why they are sneaky. The damage they cause, pigmentation, fine lines, loss of firmness, shows up months or years later. And here's what catches a lot of people off guard: UVA rays come through glass and clouds. So even if you are inside your car or at your office desk, where there is at least a window, you are still exposed to UVA rays.
And here’s the figure which will put everything into the right context: UVA radiation represents about 95% of total UV radiation reaching Earth’s surface. Therefore, if your sunscreen blocks UVB only and does almost nothing for UVA protection, you take care of just 5% of the issue. This is the reason why it is important to know how SPF sunscreen works.
How Does Zinc Oxide Sunscreen Work?
So now that we understand what we're protecting against, let's talk about how zinc oxide actually does its job.
Zinc oxide is a physical or mineral UV filter. Instead of absorbing into the skin, it forms a film that reflects UV light off of itself. Unlike the physical counterpart, chemical filters absorb into the skin first and turn the absorbed energy of the UV radiation into heat. Two different mechanisms.
But what makes zinc oxide unique is just the spectrum of ultraviolet radiation it provides protection against. From all the sunscreen components evaluated by the United States Food and Drugs Administration, only two showed broad-spectrum activity - zinc oxide and avobenzone. While even another physical filter like titanium dioxide blocks almost all UVB, it is less effective when it comes to UVA. Zinc oxide provides full coverage of UVA1, UVA2 and UVB with just one component.
One more thing worth knowing: zinc oxide is photostable. It doesn't degrade under sunlight like many other chemical filters do. The protection factor applied at 10am remains constant throughout the day until it gets physically removed due to sweating, swimming, rubbing etc.
Zinc Oxide vs Chemical Sunscreen: What's the Real Difference?
But now, a common question pops up, if both chemical and physical sunscreen products protect us from UV radiation, why should we care what kind we are using? Quite a valid question indeed, let's compare those two types.
|
Zinc Oxide (Mineral) |
Chemical Sunscreen |
|
|
How it works |
Deflects and scatters UV rays |
Absorbs UV and converts it to heat |
|
UV coverage |
Full broad spectrum (UVA1, UVA2, UVB) |
Varies by ingredients used |
|
Skin absorption |
Stays on skin surface |
Absorbed into skin and bloodstream |
|
Photostability |
Stable, does not degrade in sunlight |
Some filters (e.g. avobenzone) degrade |
|
Sensitive skin |
Anti-inflammatory, non-irritating |
Can cause stinging or reactions |
|
Reef safety |
Generally reef-safe |
Oxybenzone/octinoxate linked to reef damage |
|
FDA safety status |
GRASE (Generally Recognized as Safe and Effective) |
Most awaiting further safety data |
That FDA classification is something people don't talk about enough. When the FDA reviewed 16 common sunscreen ingredients, only zinc oxide and titanium dioxide came out as GRASE, Generally Recognized as Safe and Effective. That's not saying chemical sunscreens are dangerous, it's saying that zinc oxide has gone through the most rigorous evidence review and passed.
For a more detailed comparison regarding specific skin problems, the mineral sunscreen guide for sensitive skin is an interesting read, particularly if you have reactive or acne-prone skin.
What About the White Cast?
This is the most frequent problem associated with zinc oxide sunscreen, and it is a valid one, particularly for medium to darker skin colors. Zinc oxide particles are naturally white, and older formulations used particles that would leave a visible white film.
Newer zinc oxide sunscreens are now made with non-nano zinc oxide particles as well as light formulations that blend more easily. There is a big difference between the old image of zinc oxide and today’s formulations. Not all mineral sunscreens leave a white cast, it all depends on the formulation.
SunKiss Mineral Sunscreens: Zinc Oxide Protection Built for the UAE
As a result of the UAE climate conditions of UV radiation throughout the year, heat, humidity, and a lot of time spent near water, the selection of the right sunscreen becomes more than a cosmetic issue. SunKiss Reefinity brand sunscreens are developed with mineral protection and appropriate formula texture in mind.
Reefinity Hydra Shield Coconut SPF 30
This mineral sunscreen works with coconut oil. It contains a non-nano zinc oxide which provides complete UVA/UVB protection. The presence of coconut oil, shea butter, as well as hyaluronic acid ensures the hydration of skin particularly in dry and air-conditioned environments. A water-resistant formula for up to 40 minutes. There is a tropical scent to the product, vegan.
Reefinity Hydra Shield Unscented SPF 30
This offers the same formula of zinc oxide without any scent thus making it ideal for users who don’t like using products with scents or like layering different products on their skins in order to get optimal benefits from them. This combination of zinc oxide with aloe vera and vitamin E creates beautiful lightweight creams that can be applied well under makeup.
Reefinity Ultra Shield Unscented SPF 50+
SPF 50 plus broad-spectrum protection with reef-friendly UV filters, as well as aloe vera, hyaluronic acid, and vitamin E. It is unscented, water-resistant, and light enough for daily use of both face and body. It can be a good choice in terms of a higher SPF factor; on long beach days, while exercising in the desert, or playing outdoor sports.
All three belong to the SunKiss line of mineral sunscreens from a company which concentrates on the effectiveness of a product but is concerned about people’s health too.
SunKiss mineral sunscreens are designed specifically for the UAE sun and are reef and skin friendly, all based on the power of zinc oxide.
FAQs
Is zinc oxide sunscreen actually broad spectrum?
Of course, zinc oxide is one of the few ingredients that provide coverage for all three, UVA1, UVA2, and UVB, in the same filter. The FDA regards it as a true broad-spectrum protector, that is why it is such a common ingredient in dermatologist-favored mineral sunscreen formulations.
Does zinc oxide sunscreen need to be applied before going out?
Unlike chemical-based sunscreens that need some time to be absorbed, zinc oxide starts working on the skin immediately, however it is still advisable to put it on at least 15 minutes before going outside in order to allow the formula to settle down and be fully distributed on the skin.
Is zinc oxide safe for sensitive skin?
Zinc oxide is a natural anti-inflammatory agent that remains on the outer layer of skin and does not need to be absorbed, that is why it is recommended for people having sensitive skin, reactive skin types, or acne-prone skins. It is classified by the FDA as GRASE – the highest level of safety for any sunscreen ingredient.
Why does zinc oxide leave a white cast and how can I avoid it?
White cast is caused by the natural white color of zinc oxide. This problem was largely alleviated by non-nano zinc oxide formulations and improved lightweight bases, as well as warm mixing of zinc oxide between palms prior to application.
How often should I reapply zinc oxide sunscreen?
Reapplying sunscreen is necessary every two hours when there is constant outdoor exposure, and right after swimming, sweating a lot, or towel drying. Even photostable formulations will be wiped off the skin, which makes sun protection ineffective.
