How about decoding the 5 most common “misconceptions” about suncare products?
There are certainly more, but here are the ones we come across most frequently.
Myth #1: High-SPF Sunscreen Provides 100% Protection
False! Let’s be clear: exposing your skin to sunlight all day, even with the highest-SPF sunscreen, without protective clothing (hat, shirt, umbrella, etc.) carries real risks. No sunscreen—not even SPF 50 or a so-called «sun block»—offers unlimited protection.
Maximum exposure time depends on your skin type (phototype), the intensity of UV radiation, and your environment. For example, sunbathing in Northern Europe is not the same as sailing in the Caribbean!
There Is No Such Thing as “Total Protection”
The term “sunblock” is no longer allowed in marketing, at least in Europe. Even with the best and highest SPF, individuals react differently based on skin type. Someone with very fair skin (phototype I) may burn even with SPF 50, while someone with darker skin might tolerate longer exposure with a lower SPF. Sensible sun behavior remains essential: use shade, wear a hat….and limit exposure. Dermatologists recommend no more than one hour of sunbathing per day, and during low UV hours (early morning or late afternoon). Sunscreen is meant to help you enjoy reasonable sun exposure, not to justify staying in direct sunlight all day.
Myth #2: Reapplying Sunscreen Frequently Lets You Stay in the Sun All Day
False again. Reapplying sunscreen is important, especially after swimming or sweating, but it does not extend your total safe sun time indefinitely.
SPF and Maximum Exposure Time
The SPF (=Sun Protection Factor) is based on how long it takes for unprotected skin to burn. For example:
- A phototype I (very fair skin) person may burn in 5 minutes without protection.
- With SPF 10, they could stay 50 minutes (10 × 5) before burning.
- With SPF 50, about 250 minutes.
This is only a rough guideline. SPF calculations focus on UVB rays and do not account for UVA rays, which penetrate deeper, accelerate aging, and contribute to skin cancer. That’s why all sunscreens in the EU must now provide both UVA and UVB protection.
Frequent application maintains protection, but doesn’t reset the clock. Always listen to your skin’s signals and combine sunscreen use with physical sun protection.
A quick reminder: what is the SPF* calculation based on?
The famous “sunburn” caused by UV-B rays is an inflammatory reaction of the skin, signalling its limit of protection against UV-B radiation. The exposure time of unprotected, untanned skin before sunburn varies – depending on skin type – between 5 and 30 minutes.
Unprotected phototype 1 skin, for example, would be “burnt” after 5 minutes. Protected by an SPF 10 rating, the skin will experience this effect a little later: after 10 x 5 minutes = 50 minutes; with an IP 50 rating, after 250 min (50 x 5 minutes).
However, this maximum exposure time is not an exact mathematical science where the timer would start ringing once the 250-minute time limit had elapsed, but an indication that can vary from one person to another.
Reapplying the cream frequently after sea bathing, perspiring, showering, etc., for as long as your skin type will tolerate, makes perfect sense.
As does the fact that you should always apply the product generously and evenly to ensure optimum protection.
But applying the cream repeatedly, throughout the day, doesn’t increase this maximum exposure threshold ad infinitum. And this maximum threshold remains a notion that varies from one individual to another.
The Sun Protection Factor (SPF) essentially indicates protection against UV-B rays, and does not include in its calculation UV-A rays, which penetrate the deeper layers of the skin, accelerate skin ageing and can cause skin cancer in the long term.
But don’t panic! All current sun protection products must comply with the 2006 regulations requiring all sun creams to protect against both UV-A AND UV-B rays, in a ratio of 1 to 3. A sunscreen with an SPF protection factor of 30, for example, will have to guarantee index 10 protection against UV-A .
(see question below)
*SPF = Sun Protection Factor.
Another important clarification: the different levels of protection
The “inverted protection curve” also means that there is a much greater difference between an index of 15 and 20 than between an index of 30 and 50.
Example: the SPF is used to assess the percentage of UV rays “that pass through” and cause erythema (= sunburn)
- an SPF 2 stops 50% of UV rays
- the SPF 15 stops 93% of UV rays
- the SPF 20 stops 95% of UV rays
- the SPF 30 stops 97% of UV rays
- the SPF 50 stops 98% of UV rays
(The difference between an SPF 30 and an SPF 50 is small, just 1% in the end).
The conclusion remains the same: no sun cream provides 100% protection.
Myth #3: Organic (Mineral) and Conventional Sunscreens Are Basically the Same
Incorrect. Consumers can choose between:
Conventional sunscreens using synthetic UV filters
Certified organic sunscreens using only mineral filters (like zinc oxide or titanium dioxide)
How They Work
- Chemical filters penetrate the skin and absorb UV rays; they need 20–30 minutes to become active.
- Mineral filters sit on the skin’s surface and reflect UV rays like a mirror; they work immediately.
Different chemical filters are suspected endocrine disruptors or allergens, such as:
- Oxybenzone (Benzophenone-3)
- Homosalate
- 3-benzylidene camphor
- 4-Methylbenzylidene Camphor
- 4,4-dihydroxybenzophenone
- Benzophenone-1
- Benzophenone-2
- Octyl Methoxycinnamate also called Ethylhexyl methoxycinnamate (OMC) ,Octinoxate
- Octocrylene
They also raise environmental concerns, like coral reef damage and marine pollution. Organic-certified sunscreens avoid these synthetic filters, focusing instead on natural mineral protection.
Problematic UV filters added to other controversial ingredients
And in “conventional” suncare products, it’s not just UV filters that can pose a problem, but a host of other controversial chemical components. Generally speaking, these include – from a non-exhaustive list that varies from one product to another – high-risk products such as certain synthetic preservatives that are also classified as endocrine disruptors, components that are likely to develop nitrosamines, etc., etc., etc…
And of course a whole panoply of chemical pollutants (EDTA etc.), ingredients derived from mineral oils or silicone and many other ingredients that pose a serious problem for the environment and by definition also for marine animals and humans, the last links in the food chain.
Myth #4: Mineral Sunscreens Offer Less Protection
Not true. Some consumer reports here in France have been claiming that mineral sunscreens fail UVA protection standards, but these results often depend on the testing methods used (in vivo vs. in vitro).
Different independent tests in France (60 Millions de Consommateurs) and Germany (Stiftung Warentest, Öko-Test) have shown that certified organic sunscreens meet UVA/UVB ratio standards (1:3) and provide effective broad-spectrum protection.
Remember: regulations for UVA and UVB protection apply equally to all sunscreens, regardless of whether they’re organic certified (mineral) or conventional.
Mineral sunscreens are safe, effective, and offer environmental benefits—as long as you apply them correctly and combine them with sensible sun habits.
Myth #5: All Mineral Sunscreens Contain Nanoparticles
False. Certified organic sunscreens use micronized mineral filters, but that does not mean they all necessarily contain nanoparticles.
What Are Nanoparticles?
Particles sized 1–100 nm. Since 2013, any ingredient used in nano form must be clearly labeled with “[nano]” in the INCI list.
Most conventional sunscreens with high SPF levels are more likely to use mineral filters in nano form. In contrast, very few certified organic brands use nanoparticles, and those that do are subject to evolving natural cosmetic standards (COSMOS, Ecocert, Natrue, etc.).
Always check the ingredient list: if a filter like titanium dioxide is listed as [nano], it uses nanoparticles.
So What Should We Really Do in the Sun?
This isn’t about magic products—it’s about common sense.
Like with weight loss (eat better, move more), sun protection relies on good habits:
Sun-Smart Guidelines:
- Avoid peak sun hours (11 AM–4 PM)
- Seek shade, wear wide-brimmed hats and sunglasses
- Use long-sleeved clothing for natural photo-protection
- Never expose babies or toddlers directly to the sun
- Choose certified UV-protective clothing and umbrellas
- Gradually acclimate your skin to the sun in spring
- Eat antioxidant-rich foods (carotenoids, vitamin C/E) to boost skin resilience
Sunscreen is a tool (among other tools), not a « sunbathing license ».
Smart protection combines good products with good habits—the real key to healthy skin under the sun.
