These star ingredients in your skincare routine can become risky in the summer
Every summer, the same scenario plays out. A routine that’s perfectly tailored for winter suddenly becomes irritating, uncomfortable, and sometimes downright counterproductive. It’s all because of one factor that changes everything: UV exposure.
📌 See also: Best Vitamin C Serums
Some assets then become your best allies. Others, despite their excellent reputation, should be paused or shifted at some point during the day. Here’s how to sort them out.
The rule that takes precedence over all others: the SPF
No serum, no antioxidant, and no formula can make up for the lack of sun protection. UVA rays penetrate all the way to the dermis and break down collagen and elastin. This is the central mechanism of photoaging, and it occurs even on cloudy days and even through glass.
A broad-spectrum SPF 50+ sunscreen, applied in sufficient quantity (about 2 mg/cm², or two fingers’ worth for the face and neck) and reapplied every two hours during direct sun exposure. Everything else is just fine-tuning.
Assets to retain—and even strengthen
Vitamin C (in the morning, under your SPF). It does not replace sunscreen, but it neutralizes some of the free radicals generated by UV rays that the sunscreen filter allows to pass through. When combined with vitamin E and ferulic acid, its stability and effectiveness increase significantly. It is the logical complement to sunscreen, not a substitute for it.
Niacinamide. Versatile and remarkably well-tolerated. It strengthens the skin barrier, regulates sebum production (helpful when heat causes the skin to shine), and limits the transfer of melanin to surface cells. In other words, it helps keep pigment spots—which tend to flare up in the summer—under control.
Hyaluronic acid and ceramides. Summer dehydration is a real issue: sun, air conditioning, salt, and chlorine. Dehydrated skin often produces more sebum to compensate. A lightweight yet properly moisturizing formula helps break this vicious cycle.
Assets to Be Handled with Caution
Retinoids (retinol, retinal, tretinoin). Contrary to a widespread misconception, they do not make the skin photosensitive in the strict sense of the term. However, they do accelerate cell turnover and temporarily weaken the skin barrier. The skin becomes thinner and more reactive, reddening and peeling more easily. During peak sun exposure, reduce the frequency of use or stop altogether, even if that means resuming in September.
High-concentration AHAs (glycolic, lactic). Same logic applies. A 10 % glycolic acid peel the day before a day at the beach is a bad idea. Chemical peels are still possible in the summer, provided you space them out and use lower concentrations.
Citrus essential oils (bergamot, lemon, bitter orange). These plants pose a real problem: they contain furocoumarins, photosensitizing molecules that can cause phytophotodermatitis—characterized by burns and streaky brown spots. Avoid them entirely before sun exposure, without exception.
After-sun lotion isn't just a marketing gimmick
Skin that has been exposed to the sun is inflamed, even without visible sunburn. Panthenol, allantoin, aloe vera, centella asiatica: the goal is to soothe and restore, not to treat. Hold off on using harsh ingredients for a few days.
Beauty Decoded's Review
Some people spend 80 euros on an antioxidant serum, then apply a hazelnut-sized amount of sunscreen to their entire face. That doesn’t add up. Sun protection is the only anti-aging measure with unequivocally proven effectiveness; everything else comes second.
Skin that has been weakened by exfoliation and exposed to UV rays is the perfect breeding ground for long-lasting dark spots, which are often harder to treat than the wrinkles we were trying to correct.
What the Beauty Decoded community has to say
The app's data is unequivocal on one point: the sunglasses that really stand out are the ones you forget you're wearing.
Visit Relief Sun Aqua-fresh Rice + B5 SPF 50+ Beauty of Joseon has a rating of 5/5 based on 14 reviews, and its older sibling, the Relief Sun Rice + Probiotics, has a rating of 4.5/5 based on 72 reviews—one of the highest numbers of reviews in its category. The reason for satisfaction always comes down to the same thing: «Finally, a lightweight yet effective sunscreen—you only need a little, and I love how quickly it absorbs without leaving a greasy film.»
As for the pharmacy, the Vichy Capital Soleil UV-Age Daily Rated 4.9/5 based on 12 reviews, with users reporting they use it daily rather than just at the beach: «It has a light, fluid texture; I apply it over my day cream, and it doesn’t leave a white cast like some sunscreen products do.» « A user with oily, acne-prone skin notes that it »doesn’t make the skin oily.”.
Visit Water-Fit Sun Serum by Skin1004 (4.9/5, 22 reviews) and the Ultra Light Invisible by Cosrx (4.6/5) confirm the trend: invisible finish, compatible with makeup. However, there’s one honest caveat regarding Skin1004: «Be careful—it stung my eyes when I applied it too close to my eye.» " This is a common drawback of chemical sunscreens—something to be aware of before buying.".
Regarding antioxidants, the C Glow by Geek and Gorgeous (4.8/5, 48 reviews) stands out for its value for money, even though not all reviews agree: «Pleasant texture, but I didn’t like the effect on my skin—it was a little greasy—and I didn’t see any results.» ” It’s worth noting that a scientifically validated active ingredient doesn’t work the same way on all skin types.
Finally, when it comes to sensitive assets, users apply the principle of prudence on their own. On the Glycolic Acid 7% by The Ordinary (4.9/5, 45 reviews): «I use it once a week.» And on the Retinal 0.2% by The Ordinary (4.9/5, 32 reviews): «Be careful to use it gently, or you risk irritating your skin.»
Break Down Your Summer Routine
Is your sunscreen truly broad-spectrum? Does your nighttime serum contain an active ingredient you should stop using this summer? Application Beauty Decoded is free on iOS and Android: scan your products, get a complete breakdown of their ingredients, and compare them to reviews from a community that tests them under real-world conditions.
