Korean skincare is known in the U.S. for achieving a “glass skin” appearance or preventing aging. But do ingredients like snail mucin and salmon DNA actually help combat wrinkles, improve skin texture, and boost firmness? Here, board-certified dermatologists and skin care experts share what the research says.

1. Ginseng

Ginseng has a long history in traditional medicine. “It contains bioactive compounds known as ginsenosides that function as antioxidants and may support collagen production and skin elasticity,” Pooja Rambhia, MD, a cosmetic dermatologist at UnionDerm, told Health.1

According to Rambhia, ginseng helps neutralize oxidative stress, a major driver of collagen breakdown and visible aging. Ginseng-based ingredients may help improve the appearance of dull or fatigued skin over time.

Ginseng is commonly added to serums, essences, and creams that target early signs of aging. “It is particularly useful when used in daytime routines under sunscreen to help support the skin against environmental stressors,” said Rambhia.

2. Snail Mucin

Snail mucin, also called snail secretion filtrate, is one of the most recognizable ingredients in Korean skincare. “It contains glycoproteins, peptides, hyaluronic acid-like molecules, and antioxidants that support hydration and help promote skin repair,” said Rambhia.2

Research suggests these compounds may improve skin barrier function and support collagen, which can translate into smoother skin texture and modest improvements in fine lines with consistent use, according to Rambhia.

Snail mucin is good for people with dry, sensitive, or irritated skin who are looking for improved hydration and skin texture. “It is commonly found in essences, serums, and moisturizers and is typically applied after cleansing and toning but before heavier creams,” said Rambhia.

3. Fermented Ingredients

Fermented ingredients are a hallmark of Korean skincare. Fermented rice water helps brighten and smooth, and other probiotic-derived fermented extracts like bifida ferment lysate may support the skin barrier and help maintain a balanced microbiome.3 This can benefit people with dull, uneven skin without the risk of irritation associated with stronger active ingredients.

Fermented ingredients are most commonly used in essences, serums, and toners. “They are compatible with most active ingredients, pair particularly well with niacinamide, and individuals with sensitive skin may benefit from patch testing before regular use,” said Rambhia.

4. Niacinamide

Niacinamide is a form of vitamin B3 that is widely used in Korean skincare. “It supports the skin barrier by increasing ceramide production, reduces inflammation, and helps regulate sebum production,” said Rambhia.4

Clinical studies have also shown that niacinamide can help reduce hyperpigmentation and uneven skin tone, minimize the appearance of pores, and strengthen the skin barrier. It’s useful for a wide range of skin types, including oily, acne-prone, and sensitive skin.

Niacinamide is found in toners, serums, and moisturizers. “It can be used both morning and night and pairs well with retinoids, sunscreen, and antioxidants,” said Rambhia. “Concentrations around 2% to 5% are typically well tolerated.”

5. Centella Asiatica

Centella asiatica (cica) is a botanical ingredient widely used in Korean skincare for its calming and reparative properties. “The active components of this plant have been shown in studies to promote fibroblast activity and support collagen synthesis while also reducing inflammation,” said Rambhia.5

According to Michelle Lee, MD, a board-certified plastic surgeon and founder of PERK Plastic Surgery, it’s frequently found in products designed to calm irritated skin and support barrier repair, making it particularly helpful for individuals with redness or sensitive skin.

It is commonly found in serums, creams, and barrier-repair formulations and can be used alongside most active ingredients to improve tolerability.

6. Salmon DNA (PDRN)

PDRN (polydeoxyribonucleotide) is a regenerative ingredient derived from salmon DNA that has become a staple in Korean aesthetic medicine. According to Lee, it works by activating a receptor in your body called the adenosine A_2A receptor. These receptors then cause certain skin cells to become more active and produce more collagen, which can help improve elasticity and promote healing.6

“You’ll most commonly see it in serums, ampoules, and sheet masks, and it’s usually applied after cleansing and before moisturizer,” Whitney Hovenic, MD, a double board-certified dermatologist and Mohs surgeon, told Health. “It can be especially helpful for people with a compromised skin barrier, post-procedure skin, early signs of aging, or skin that’s recovering from inflammation like acne.”6

In clinical practice, PDRN is often used post-procedure, such as after laser resurfacing or microneedling, to accelerate tissue repair, said Lee.7

7. Peptides

Peptides are short chains of amino acids that act as signaling molecules for skin cells, Valerie Aparovich, a biochemist, certified cosmetologist, aesthetician, and science team lead at OnSkin, told Health.

According to Aparovich, signal peptides stimulate cells to produce more collagen, elastin, and other structural proteins in the dermal matrix.

Aparovich says peptides have a high safety profile, are non-drying and non-comedogenic, and are suitable for all skin types. “[It’s] generally recommended to introduce them as anti-ageing therapy starting at age 30 to 40,” she said. “Prioritize products that stay on the skin for longer periods, such as creams, and use them daily and consistently over time, usually for at least three months, so they can deliver visible results.”

8. Tranexamic Acid (TXA)

Tranexamic acid is typically found in products focused on brightening and treating discoloration. “You’ll often see it in serums paired with ingredients like niacinamide, licorice root, or vitamin C,” said Hovenic.

Tranexamic acid improves the appearance of photodamaged skin and hyperpigmentation, which are often linked to aging, says Aparovich.8 “It effectively reduces dark spots, sun-induced discoloration, and melasma by regulating pathways involved in excess melanin production, resulting in a more even complexion.” As with most pigment treatments, consistent use and daily sunscreen are key to achieving the best results, she added.

Tranexamic acid is generally considered safe and may cause only minor redness, which resolves within a few hours, said Aparovich.

9. Propolis Extract

Propolis is a resin-like substance produced by bees and is rich in flavonoids, polyphenols, and antioxidants, said Hovenic. “It offers antimicrobial and anti-inflammatory properties, which can help reduce acne-causing bacteria and calm irritated skin, while also supporting hydration and skin barrier function.”9

According to Hovenic, some studies suggest propolis may promote wound healing and improve overall skin recovery, which can help smooth uneven texture and soften the appearance of fine lines over time.

It is typically found in ampoules, serums, essences, and masks, and fits well into layered hydration routines.