
COSRX The Vitamin C 13 Serum is a product with 25 ingredients: Water, Ascorbic Acid (Vitamin C), Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate and 15 more.
Contains: Vitamins - Ascorbic Acid (Vitamin C), Panthenol, Niacinamide; Antioxidant - Ascorbic Acid (Vitamin C), Acetyl Glucosamine, Caffeine, Sodium Sulfite, Glutathione, Tocopherol, Arginine, Niacinamide, Glycyrrhiza Glabra (Licorice) Root Extract;
Organic score: 24% natural, 64% chemical. Vegan - No; Cruelty free - Yes; Reef safe - Yes;
Positive effects
Concerns
INCI - Full Breakdown
Water is a great solvent. It’s neutral and doesn’t provide any strong positive or negative effects. It just helps components to mix better and to transport active components.

Vitamin C is known for its strong antioxidant activity. It helps to slow down aging processes. The other positive effect of this ingredient is that it helps to make skin tone even. It's a great ingredient to counter dark areas and uneven skin tone. It's well-researched and considered safe. But it's acid and can irritate the skin if used too often.

Butylene Glycol is a very popular synthetic alcohol. It helps the product to absorb deeper and faster. It is also a solvent for other ingredients. As for the skin benefits, it helps to attract water and helps to make the skin softer.
Dipropylene Glycol is a solvent, emulsifier, viscosity decreasing, and masking agent. It helps to extract useful chemicals from plants and leaves, making natural components in a product more effective. It also helps to hydrate the skin. Considered safe for health and doesn't irritate the skin in common concentration.

Panthenol is a proud member of a league of the best-performing components. It's a stable form of Vitamin B5 and is also known as Pro-Vitamin B5. It’s a very good and effective component for hydration, healing, and soothing irritated skin. It works so soft and gentle that it’s even recommended for people with skin problems like eczema.
In haircare products it’s used for protecting the fiber. It’s researched very well and doesn’t have any negative side effects.

Caffeine stimulates all the processes inside skin cells. It's very effective for reducing swelling on the face (especially great for under the eyes area). The effectiveness depends on the concentration, the more component you apply the better the effect will be.
It also tones up the skin making it look younger. It's great for dry skin because it stimulates the synthesis of cholesterol, a chemical that helps to form a protective layer on the surface of the epidermis.

Sodium Hyaluronate is an amazing component! It plays very important role in skin hydration process. It helps to maintain water balance and lower water loss. Scientists have found a direct dependence between the level of Sodium Hyaluronate in cells and skin aging. That's why this component is so much important. It must be in your routine if you want to have a healthy and fresh looking skin.
Some people think that Sodium Hyaluronate and Hyaluronic acid are different names of the same component, but it is not entirely correct. Hyaluronic acid is a different chemical but with similar effects. Actually, Sodium Hyaluronate is used in cosmetics much more often because it’s more stable and has much better resistance to oxidation.
Functions
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