The Formulation and Performance of Suncut "Weightless UV Essence": The Culmination of Zinc Oxide-Based Sunscreens and How to Choose by Skin Type

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This product is a non-chemical sunscreen that relies mainly on zinc oxide as its UV scattering agent. The Suncut series has generally tended to achieve high protection and low prices by including UV absorbers and alcohol. This product, however, is both free of UV absorbers (non-chemical) and alcohol-free.

The full ingredient list shows a base of butylene glycol (BG), cetyl ethylhexanoate, PG dicaprate, dimethicone and others, and the formula is glycerin-free. For UV scattering, it uses zinc oxide alone, with no titanium dioxide, and it includes silica as a sebum-absorbing powder. Moisturizing ingredients include chamomile flower extract, sage leaf extract, serine, sodium hyaluronate and hydrolyzed collagen. Overall, it is characterized by a simple, pared-down composition.

In addition to being fragrance-free, free of synthetic colorants and paraben-free, it has been allergy tested, patch tested, stinging tested and non-comedogenic tested, putting a design focused on reducing the burden on skin front and center.

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Most high-SPF sunscreens based on zinc oxide have taken the form of two-phase liquids (W/O emulsions), in which water is dispersed in oil. While two-phase formulas offer excellent water resistance, they have had texture problems: the stickiness typical of oils and a strong, lingering film-like feel after application.

This product, by contrast, uses a creamy "essence formula" (O/W emulsion) in which oils are encapsulated within a water-based phase. It is extremely rare to achieve SPF50+ / PA++++, Japan's highest ratings, with zinc oxide alone while keeping a watery, fresh essence base.

It has also earned "UV water resistance ★★," meaning it passed an 80-minute water immersion test. Securing water resistance in an essence formula can be considered the result of clearing a high technical hurdle.

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Comparing it with Kao's "Bioré UV Aqua Rich Mizuhada Kioku UV (Aqua Protect Essence)," which came out earlier and was praised as a new generation of watery non-chemical sunscreen, makes the difference in design philosophy even clearer.

Bioré's Mizuhada Kioku UV is a watery formula built mainly around titanium dioxide, with no zinc oxide, and it shares traits such as being alcohol-free, glycerin-free and fragrance-free. However, its UV protection stops at SPF50 / PA+++, and its UV water resistance did not reach ★★. Achieving those figures with titanium dioxide alone is itself an advanced technical feat, but in terms of absolute UV protection, Weightless UV Essence, with SPF50+ / PA++++ and UV water resistance ★★, comes out ahead.

Titanium dioxide also inevitably tends to leave a white cast on the skin, and the whiteness tends to stand out unless it is spread thoroughly. This product, on the other hand, takes advantage of zinc oxide's properties to achieve extremely high transparency. Shine, film-like feel and raw-material odor on application are also kept down, resulting in a texture that does not feel heavy on the skin, living up to the "weightless" in its name.

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Although it feels very light, it carries UV water resistance ★★, so the film formed on the skin's surface is highly durable. The packaging states that it can be removed with soap, but for areas with many contours such as the face, or for skin types that want to avoid clogged pores and acne, careful removal using oil cleanser or similar is recommended.

The "Weightless Veil (Aqua Hold formulation / Micro Smooth Block technology)" used in this product appears to take an approach similar to Kao's AquaCapsule technology, and is thought to work by having water-containing capsules break down evenly on the skin and adhere to it. It is designed to stand up well to sweat and water, but the film itself is not completely impossible to remove, so regular reapplication is essential during long outdoor activities, swimming in the sea and the like.

As for price, it is set at 1,430 yen for 50 g (Maison KOSÉ selling price). That is somewhat above Suncut's standard price range, but considering that its texture and formulation quality would hold up even if it were sold as a department store brand for several thousand yen, it offers extremely good value for money.

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Zinc oxide has extremely good properties as a UV filter. Compared with titanium dioxide, it can block a wider range, extending to long-wave UVA (long UVA), blue light and near-infrared. In addition, uncoated zinc oxide binds with free fatty acids in sebum to form "zinc fatty acid salts," which solidify the makeup film and help keep it from breaking down.

On the other hand, there are skin types for which this solidifying action that forms zinc fatty acid salts leads to clogged pores and triggers acne. Acknowledging that their own content was one factor in creating the trend toward zinc oxide-free products, Kazunosuke breaks down the proportions of skin types and how each should approach it as follows:

• About 80% of people: Problems such as clogged pores from zinc oxide are unlikely, and they can take full advantage of its high UV protection and transparency.
• About 10–20% of people: Zinc oxide does not agree with their skin, causing clogged pores and inflammation, so they need to choose "zinc oxide-free" products, such as those based on titanium dioxide.

For the 80% who do not need to avoid zinc oxide entirely, a product like this one, which combines high protective performance with a texture that does not feel burdensome, is one of the best options.

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In recent years, it has sometimes been pointed out on social media and elsewhere that "zinc oxide and glycerin are being villainized too much." The counterargument is that baseless rumors could never take hold through the influence of a single content creator alone.

The movement to avoid certain ingredients spread through such content precisely because there was a significant group of people who had latently been having skin problems with those ingredients, and who, after coming across the information and trying it, saw their skin improve, generating firsthand experiences and resonance. Even a minority of 10 to 20 percent amounts to roughly 10 million people when applied to the population, making it a serious issue that cannot be ignored when choosing cosmetics.

It is not appropriate either to erase the existence of people who react badly by saying "zinc oxide doesn't clog pores, so you should use it," or to stoke excessive fear by saying "zinc oxide is bad, so everyone should avoid it." Those who react badly should be offered alternatives based mainly on titanium dioxide, and those who can use it without problems should be recommended products that make use of zinc oxide's excellent protective performance.

This product is presented as an option that lets people whose skin agrees with zinc oxide enjoy freedom from UV absorbers, alcohol and glycerin, top-level UV protection and high water resistance, all with the lightness of an essence.