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Azelaic acid is an ingredient used to manage acne, post-acne dark marks, uneven skin tone, and some types of redness linked to inflammation . Although it has “acid” in its name, it does not work mainly as an exfoliant like AHA or BHA. Instead, azelaic acid helps calm inflammation, prevent skin cells from building up inside pores, and limit excess melanin production. These combined effects make it especially useful for people dealing with more than one skin concern at the same time. What Is Azelaic Acid? Azelaic acid is a naturally occurring type of dicarboxylic acid . In skincare and dermatology, it is mainly used in products applied directly to the skin. It can: Help calm inflammation Limit the growth of acne-related bacteria Regulate the buildup of skin cells that can clog pores Inhibit tyrosinase , an enzyme involved in melanin production Because it works in several ways, azelaic acid can address connected concerns such as active breakouts and the dark m...

Peptides are short chains of amino acids commonly used in skincare for firmness, smoother texture, and visible signs of aging. In Korean skincare, they are often found in serums, ampoules, eye creams, and face creams. Peptide skincare can seem simple at first, but “peptide” is actually a broad term. Different peptides have different structures and may be used for different purposes. For that reason, two products labeled as peptide skincare may contain very different ingredients and formulas. What Are Peptides? Peptides are short chains of amino acids . Amino acids are the building blocks of proteins. Skin contains proteins such as collagen, elastin, and keratin, which help support its structure and appearance. Peptides are not the same as these proteins. They are much shorter structures made from the same basic building blocks. On an ingredient list, you may see names such as: Copper Tripeptide-1 Palmitoyl Tripeptide-1 Palmitoyl Tetrapeptide-7 Acetyl Hexapeptide...

Retinol and retinal are two well-known vitamin A ingredients used in skincare. For many years, retinol was the more familiar name. Today, you may also see retinal , or retinaldehyde , clearly listed on skincare products. Both belong to the retinoid family and are used for concerns such as fine lines, uneven skin texture, uneven skin tone, and clogged pores. However, they are not the same ingredient. The main difference is how many conversion steps they need before reaching retinoic acid , the active form of vitamin A in the skin. So, what exactly is retinal, and how is it different from retinol? What Is a Retinoid? To understand retinol and retinal, it helps to know the word retinoid . Retinoid is a broad term for ingredients related to vitamin A. Common examples include: Retinol Retinal or retinaldehyde Tretinoin Adapalene In simple terms, retinoid is the larger vitamin A family , and retinol and retinal are both part of it. Not all retinoids are ...

PDRN (Polydeoxyribonucleotide) is gaining attention as a new ingredient in Korean skincare. In Korea, it can now be found in serums, ampoules, creams, and sheet masks made for hydration and skin barrier care. Outside Korea, interest has grown through products described as “Salmon DNA Serums.” However, some online content compares cosmetic PDRN with professional skin treatments or exaggerates it as an ingredient that can completely regenerate the skin. In this guide, you will learn what PDRN is, how it is used in skincare, how it differs from professional treatments, and what you can realistically expect from a cosmetic PDRN product. What Is PDRN? PDRN stands for Polydeoxyribonucleotide . It is made from small, purified fragments of DNA. In cosmetics, it is mainly used in products designed for hydration, skin barrier care, and overall skin comfort. Many established PDRN materials are made from purified salmon- or trout-derived DNA. However, the source, molecular size,...

Vitamin C is one of the best-known skincare ingredients for dullness and uneven skin tone. However, brightening is not its only role. As an antioxidant, vitamin C helps protect the skin from environmental stress caused by factors such as UV exposure and air pollution. It also supports collagen production, which is important for healthy-looking skin. Choosing a vitamin C product can be confusing because the ingredient may appear in different forms. Some products contain pure vitamin C , while others use vitamin C derivatives designed to improve stability and make the formula more comfortable to use. Neither form is always better. The best choice depends on your skin type, the product’s overall formula, and the type and concentration of vitamin C it contains. What Is Vitamin C? Vitamin C is an essential nutrient for the body and is also naturally present in the skin. In skincare products, pure vitamin C usually appears on the ingredient list as Ascorbic Acid or L-Ascorb...

Hyaluronic acid (HA) is a popular moisturizing ingredient that helps attract and hold water in the skin. Although its name includes the word “acid,” it does not exfoliate the skin like AHA or BHA. Hyaluronic acid is a type of sugar naturally found in several parts of the body, including the skin, eyes, and joints. In skincare, hyaluronic acid helps improve hydration, making the skin feel softer and look smoother. It can also make fine lines caused by dryness appear less noticeable temporarily. What Is Hyaluronic Acid? The most important feature of hyaluronic acid is its ability to bind with water . When applied to the skin, it helps maintain moisture in the surface and outer layers. It is used in many types of skincare products, including toners, essences, ampoules, serums, creams, gels, and masks. On an ingredient list, it may appear under several names: Hyaluronic Acid Sodium Hyaluronate Hydrolyzed Hyaluronic Acid Sodium Hyaluronate Crosspolymer Thes...

Niacinamide is a form of vitamin B3 and one of the most widely used ingredients in modern skincare. It can help support the skin barrier , improve the appearance of uneven skin tone, manage excess oil, and make rough skin texture look smoother. Unlike ingredients that mainly focus on one concern, niacinamide offers several benefits at the same time. It is also generally easy to combine with other skincare ingredients, making it suitable for many skin types. What Is Niacinamide? Niacinamide, also known as nicotinamide, is a water-soluble form of vitamin B3. In skincare, it is used to support the skin’s natural functions rather than remove or exfoliate the outer layer of the skin. It helps the skin maintain a healthier protective barrier while also improving the look of dullness, dark spots, excess oil, and uneven texture. Its effects are usually gradual. Consistent use is more important than expecting an immediate change. Key Benefits of Niacinamide 1. Supports t...

Panthenol is widely used in Korean skincare to moisturize the skin and support the skin barrier . You can find it in moisturizers, barrier creams, soothing creams, serums, and ampoules. It is especially common in products for skin that feels dry, tight, or easily irritated. Unlike exfoliating or skin-renewing actives, panthenol focuses on hydration and skin comfort . This article explains what panthenol is, how it works, and why it is so common in Korean skincare. What Is Panthenol? Panthenol is a form of provitamin B5 . It is an alcohol derivative of pantothenic acid, also known as vitamin B5. When applied to the skin,  panthenol can be converted into pantothenic acid. In skincare, it is mainly used as a humectant and skin-conditioning ingredient . Panthenol is commonly added to products to: Attract and retain moisture Reduce dryness and tightness Support skin barrier function and recovery Keep the skin soft and smooth Help dry or sensitive skin feel more ...

Centella Asiatica is a plant with a long history of traditional use in Asia. In Korea, it is known as byeongpul (병풀) . Today, Centella is one of the best-known soothing ingredients in Korean skincare. On skincare labels and product names, it is often called Cica . Centella is commonly used in products designed for skin that feels sensitive, irritated, dry, or stressed. It is best understood as a supportive skincare ingredient that may help calm the skin rather than an ingredient that treats a specific skin condition. What Is Centella Asiatica? Centella Asiatica is a plant in the Apiaceae family. In Korea, it is known as byeongpul. In skincare, it may be used as a plant extract or as specific compounds derived from the plant. On ingredient lists, you may see names such as: Centella Asiatica Extract Centella Asiatica Leaf Extract Centella Asiatica Water The type of extract, concentration, and overall formula can vary from on...

Ceramides are important lipids that naturally exist in your skin. They are a key part of the skin barrier , which helps keep moisture in and protect the skin from the outside environment. This is why ceramides are commonly found in skincare for dry or sensitive skin and a weakened skin barrier. What Are Ceramides? Ceramides are a type of lipid found mainly in the stratum corneum , the outermost layer of the skin. One simple way to understand the skin barrier is to imagine a brick wall. The skin cells are like the bricks. Lipids, including ceramides, help fill the spaces between them. Ceramides do not work alone. Cholesterol and fatty acids are also important parts of this lipid structure. Together, these lipids help maintain a healthy, well-functioning skin barrier. Why Are Ceramides Important for Your Skin? A healthy skin barrier helps keep moisture inside the skin while protecting it from the outside environment. When the lip...