This is often where things get tricky. You want to switch to a natural sun protection, you find yourself facing two products on a shelf, and you are not really sure whether one is better than the other, whether it will leave a white cast on your face, or whether it applies the same way. Every year as spring returns, the same questions come up. And frankly, the answers you find are either too technical or too commercial. We have tried to do things differently here.
What is the difference between a mineral filter and a chemical filter?
This is probably the most frequently asked question, and it deserves a proper answer. Mineral filters, also known as physical filters, are substances of mineral origin, primarily zinc oxide and titanium dioxide. They work by creating a barrier on the surface of the skin that reflects UV radiation. Chemical filters work differently: they absorb UV rays and convert them into heat. The distinction is not simply a matter of marketing. It has concrete implications for how the product behaves on your skin, its overall formulation, and what you choose to apply every day.
Natural and organic sun protections rely almost exclusively on mineral filters, because the most common chemical filters are not permitted under organic certifications. It is not a question of better or worse in any absolute sense - it is a question of composition and personal choice.
Why do natural sunscreens leave a white cast?
The white cast is the most commonly cited drawback of mineral sun protections. It comes directly from physical filters, particularly zinc oxide, which is a white powder by nature. When it is incorporated into a formula, some of that opacity ends up on the skin. The good news is that formulas have improved considerably in recent years. Brands are working on particle size and textures to reduce this effect.
That said, to be honest: on darker skin tones, the white cast remains more visible than on lighter complexions, and some formulas are less refined than others on this point. If this is something that concerns you, looking at reviews from people with your skin tone before buying remains the most reliable approach. Nobody can promise you zero white cast from a purely mineral filter.
Is SPF 30 really enough, or do you always need to go for SPF 50?
The protection factor, or SPF, measures the product's ability to filter UVB rays. SPF 30 filters around 97% of UVB rays, while SPF 50 filters around 98%. The numerical difference is therefore smaller than people often think. But it is not the only variable that matters. The amount applied, the frequency of reapplication, and actual exposure all play an equally significant role.
In practice, an SPF 30 applied correctly and reapplied every two hours will be more effective than an SPF 50 applied in a thin layer and forgotten. If you have very fair skin, a history of frequent sunburn, or if you spend long hours in the sun, SPF 50 remains the more cautious choice. For everyday summer exposure in an urban setting, a well-used SPF 30 is a serious form of protection.
Can you apply a natural sun protection on your face without it looking shiny or feeling sticky?
This is a genuine concern, especially if you have combination or oily skin. Many sunscreen formulas, even natural ones, have rich textures that do not suit every skin type. This is not inevitable, but you need to look for the right textures: fluids and lightweight emulsions designed for the face apply far better than a body cream on the T-zone.
If you tend to look shiny during the day and want a protection that fits into a lightweight routine, the fluide matifiant by Avril Beauté can complement your sun protection: its formula enriched with organic green tea floral water is designed to regulate sebum and leave a matte finish. It is not a sun protection in itself, but it integrates well into a summer facial routine when you want to keep skin looking fresh without weighing it down. This kind of product can make a real difference to the order of application and how your skin holds up throughout the day in the sun.
Do you need to reapply a natural sun protection as often as a conventional one?
Yes, absolutely. The frequency of reapplication does not depend on whether the protection is natural or chemical - it depends on the photostability of the filters, perspiration, contact with water, and time spent in the sun. Mineral filters do not break down under UV rays as quickly as some chemical filters, but they are removed mechanically: you sweat, you rub your skin, you swim, and the protection diminishes.
The rule remains the same for all types of protection: reapply every two hours during direct exposure, and always after swimming or towelling off. If you skip this step, the SPF shown on the bottle no longer reflects what your skin is actually receiving. This is often where the sunburns nobody expected creep in.
Do natural sun protections also protect against UVA rays?
This is an important question, because SPF - which only measures UVB protection - is often discussed without any mention of UVA rays. Yet UVA rays penetrate deeper into the skin and are present all year round, even on cloudy days. An effective sun protection must cover both types of radiation.
Zinc oxide, the reference mineral filter in natural formulas, offers broad-spectrum protection covering both UVB and UVA rays. Titanium dioxide, another common mineral filter, is more effective against UVB and often needs to be combined with other filters to cover the full UVA spectrum. On a natural sun protection, check whether the words "large spectre" or "broad spectrum" appear on the packaging: this is the simplest way to know whether both types of radiation are being addressed.
One final point, because there is something that is not said often enough: no sun protection, natural or otherwise, protects 100%. SPF 50 does not mean you can stay in the sun without limit. It means your skin is better protected than with nothing, provided the product is applied generously and regularly. Sun protection is part of a broader set of behaviours: seeking shade during the hottest hours, not exposing young children to direct sun, covering sensitive areas. The bottle is part of the answer, not the whole answer. And frankly, it is worth saying so in the middle of summer.
Choosing a natural sun protection does not require expert knowledge of chemistry. It simply requires knowing what you are looking for: a texture that suits your skin, an SPF appropriate to your level of exposure, and a formula you will actually be inclined to reapply. Because the best protection is the one you genuinely use.
