Japanese skincare traditionally separates hydration into two steps: a watery lotion that floods the skin with moisture, followed by a milky emulsion that seals it in. Many emulsions are light and pleasant but do little sealing. Carté HD's Moisture Emulsion is more substantial. A registered quasi-drug with a heparin-like substance and dipotassium glycyrrhizinate as actives, it combines humectants with real occlusives and barrier lipids. Launched in 2020, it has nearly 1,500 reviews on @cosme, an A rating from the testing magazine LDK and more than twenty Japanese Best Cosme awards, according to the brand.
Carté HD is made by KOSÉ Maruho Pharma, a company created in 2019 by KOSÉ and Maruho, a pharmaceutical manufacturer whose focus is dermatology. The line's signature ingredient, the heparin-like substance, belongs to a group of water-binding polysaccharides used for decades in Japanese dermatology to treat dry skin. Heparinoids help the outer layer of the skin hold onto water and support barrier recovery. Dipotassium glycyrrhizinate, from licorice root, provides anti-inflammatory activity that helps with the roughness and redness common in dry, sensitive skin.
The rest of the formula is built to lock moisture in. Butylene glycol, glycerin, diglycerin and glyceryl glucoside are humectants, and serine, theanine and acetyl hydroxyproline are amino acids related to the skin's natural moisturizing factor. Mineral oil, petrolatum, triethylhexanoin, cetyl ethylhexanoate and squalane provide occlusion and emollience. A lipid complex including phytosterols, phytosteryl oleate and a lauroyl glutamate ester is designed to imitate the skin's own intercellular lipids. Vitamin E adds antioxidant protection. The emulsion is fragrance-free and preserved with phenoxyethanol and methylparaben.
The combination of mineral oil and petrolatum sometimes surprises people, but both are among the best-studied and least allergenic occlusives available. They reduce water loss significantly, which is why they appear in many products recommended for eczema and very dry skin. Methylparaben, likewise, is a low-sensitising preservative, though some shoppers prefer to avoid parabens.
In use, the emulsion looks thick in the palm but changes as it is spread, softening and seeming to melt into the skin. Carté recommends two pumps after the lotion, followed by cupping the palms over the face for a few seconds, a technique that warms the product and encourages even absorption. Skin is left soft, plump and comfortable, without the greasy film that heavy creams can leave. Reviewers frequently note that it keeps dry skin comfortable all day and smooths flaky patches.
It is particularly well suited to dry and sensitive skin, and to anyone whose skin becomes rough and tight in winter or in air-conditioned environments. Normal skin will appreciate it in colder months. Combination skin can use a smaller amount or apply it only to drier areas. Oily skin may find it too rich, and the esters, polysorbate and mineral oil make it less suitable for people managing fungal acne.
Amount and timing are worth adjusting through the year. In summer or in humid climates, a single pump may be plenty, especially in the morning under sunscreen. In winter, two pumps morning and night, with an extra layer on the cheeks and around the mouth, keeps dry skin comfortable. People who use retinoids or exfoliating acids often find that applying the emulsion a few minutes after the active, rather than before, buffers dryness without blocking the treatment.
It also performs well in situations that challenge the skin barrier: long flights, ski trips, heated offices or the weeks after a sunburn has healed. In those conditions, the occlusive component matters more than any active, and the emulsion supplies enough of it without the heaviness of a balm. For makeup wearers, giving it a minute to settle before foundation prevents pilling.
One more practical note: the emulsion is fairly thick, so a pump bottle is ideal for keeping it clean, and the refill pouches mean the pump can be reused. Turning the bottle upside down for a few seconds when it is nearly empty helps get the last of the product out.
The emulsion works as part of the Carté HD routine, but it does not require the matching products. Applying it over any hydrating lotion or toner gives the best results, since the humectants underneath provide water for the occlusives to seal in. Very dry skin can add the Carté HD cream at night as an extra layer.
For readers outside Japan, the challenge is access. In Japan, the 120 ml bottle costs about ¥2,090, which is good value for a medicated, fragrance-free moisturizer, and refills are available. Abroad, it is sold mainly through online importers, whose prices vary widely.
KOSÉ is a legacy cosmetics company, and the Maruho partnership gives Carté HD a credible dermatological foundation. Quasi-drug approval means the actives and their claims have been reviewed by Japanese regulators, though product-specific clinical trials are not published in English. On formulation alone, the emulsion is one of the more convincing moisturizers for dry, sensitive skin: well-designed, fragrance-free and effective. If you can source it, and parabens do not concern you, it is a strong choice.
