SKU: 7813571995

COSRX The Vitamin C 23 Serum 20ml

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Description

COSRX The Vitamin C 23 Serum 20mlProduct Description: Enhance your skin's elasticity with 23% pure vitamin C. This serum, featuring 23% high concentration stabilized pure vitamin C, improves skin tone, reduces wrinkles, and targets dull and uneven skin as a powerful vitamin C booster. To prevent oxidation, the serum is divided into two layers, with oil on top for a moisturizing finish. Product Benefits: Improves skin elasticity Evens out skin tone and reduces dark spots Brightens the

Product Description: Enhance your skin's elasticity with 23% pure vitamin C.

This serum, featuring 23% high-concentration stabilized pure vitamin C, improves skin tone, reduces wrinkles, and targets dull and uneven skin as a powerful vitamin C booster. To prevent oxidation, the serum is divided into two layers, with oil on top for a moisturizing finish.

Product Benefits:

  • Improves skin elasticity

  • Evens out skin tone and reduces dark spots

  • Brightens the skin

  • Combats signs of aging

Skin Type:

  • Intensive care for uneven skin tone and hyperpigmentation

Size: 20 ml

Usage: Morning and evening

  1. Wash your face

  2. Lightly shake the bottle one to two times from side to side.

  3. Apply a few drops to the skin.

  4. Gently massage the serum in with your fingertips, starting from the center of the face and working outward.

  5. When used in the morning, always follow up with sunscreen SPF 30 or higher.

Storage:

  • Store in the refrigerator (3–10°C)

  • Use immediately after purchase and store upright after opening

  • Recommended to be used within 2 months of opening to maintain active ingredients

Important:

  • Experienced vitamin C users

  • Attach the included dropper upon first use.

  • The serum is highly concentrated but can be used both morning and evening.

  • Avoid contact with the eye and mouth areas.

  • Recommended not to be used in conjunction with other acids such as AHA, BHA, retinol, or other strong active ingredients to avoid irritation.

Patch Test Always perform a Patch Test to check if your skin may react negatively to a new skincare product.

  1. Apply a small amount of the product to the skin, for example, behind the ear or on the inside of the wrist.

  2. Leave the product on for at least 24 hours without washing it off.

  3. Regularly check the area for signs of redness, itching, swelling, or other reactions. If a negative reaction occurs, discontinue use immediately and consult a doctor if necessary.

  4. If the skin feels normal and shows no reactions, you can start using the product as usual.

Precautions

  • Do not use the product if you are allergic to any of the ingredients.

  • The product is only for external use. Do not ingest.

  • Keep out of reach of children and animals.

  • Avoid contact with the eyes. In case of contact, rinse thoroughly with water and consult a doctor if necessary.

  • Do not use on damaged or irritated skin.

  • If signs of a negative reaction from the product appear, such as redness, itching, swelling, or other reactions, discontinue use immediately and consult a doctor if necessary.

Ingredients

Water, Ascorbic Acid (23%), Propanediol, Dimethicone, Tromethamine, Panthenol, Ethyl Ascorbyl Ether, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Sodium Sulfite, Disodium EDTA, Glutathione, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Elaeis Guineensis (Palm) Oil, Butylene Glycol, Arginine, Niacinamide, Pentylene Glycol, Alcohol Denat., Helianthus Annuus (Sunflower) Seed Oil, Glycyrrhiza Glabra (Licorice) Root Extract, Methyl Trimethicone, Carthamus Tinctorius (Safflower) Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa (Carrot) Root Extract, Beta-Carotene

Please note that ingredients and content may change over time. This means that the ingredients listed on our website may differ from those actually in the product. Always read the ingredients on the package before use. If you have any questions or concerns, please contact our customer service.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 7813571995

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Tiffani
Waukegan, US
★★★★★ 5
Best magnesium from the best supplement brand.
Thorne can do no wrong in my book. They just can’t. I take magnesium every night. Usually magnesium glycinate. However, I read that that can start to cause night sweats over overtime. So moving decent was kind of a trial to see if that stopped the issue. It did immediately. The bonus of the powder though is that I can have it in a little bit of cherry juice or a mocktail before I go to bed. The flavor is great, and I haven’t noticed any grittiness whatsoever. That’s sad, I drink a lot of protein drinks so it’s entirely possible. I’m used to grittiness. Since starting to take this, I’ve been sleeping just as well as I have with the magnesium glycinate. Perhaps even a little bit better because this is higher quality and I’m not getting the night sweats.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
S
Samhain
Charlottesville, US
★★★★★ 4
Simple Magnesium Powder That Is Easy Enough to Take
I just started taking this Magnesium Citrate powder, so it is too early to know if it will help with things like muscle support, heart health, bone health. Magnesium is an important mineral for the body and it plays a role in muscle function, nerve signaling, and overall balance, so I like the idea of adding it to my routine. The citrus berry flavor is not too horrible, which is a pleasant surprise because some magnesium powders can taste pretty rough. This one is easy enough to drink without feeling like you have to force it down. I also like that it is third party certified and comes with a full sixty servings. I will need more time to see if it makes a noticeable difference, but so far the experience has been simple and the taste is manageable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 14, 2026
I
Inna Tysoe
Grantham, US
★★★★★ 5
2 months supply, tasty berry bubblegum flavor, no morning cramps.
I've been taking Magnesium supplements for a long time, usually in capsule form. Starting from about age 45 I kept getting these awful morning calf cramps. Especially stretching, or on cold morning. The sudden agony was unexpected and concerning. Magnesium is the answer and this water-soluble magnesium from Thorne is no exception. For this particular problem, calf cramps. The results are noticable within a couple of days. If I stop taking magnesium for 3-5 days the cramps come back. Thorne powder has a berry flavor that is very similar to bubble gum. It dissolves easily without leaving any lumps. Is great to help you take your other supplements. I've been taking this for about 3 weeks with no cramps. Price is a little higher than capsules typically are. This works for me and the tub should last two-months if you follow the directions.
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Reviewed in the United States on May 25, 2026
M
Michelle Pepe
Alexandria, US
★★★★★ 5
Easy Way to Add Magnesium Support
Magnesium is one of those supplements many people find helpful as part of their wellness routine. The powder format makes it easy to adjust serving sizes and mix into drinks. One thing I liked was the citrus berry flavor, which made it more pleasant than many unflavored supplements. Overall, a convenient magnesium option from a well-known brand
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Reviewed in the United States on June 3, 2026
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Zach
Bozeman, US
★★★★★ 5
Great Taste and Mixes in Water Well
I’ve been using this magnesium citrate powder for a little while now, and overall it’s been a positive experience. One of the standout aspects is how well it mixes. It dissolves easily in water with minimal residue, which makes it much more convenient compared to some other powdered supplements I’ve tried. The citrus berry flavor is also quite good: light, slightly sweet, and easy to drink without being overpowering. The powder format makes it simple to adjust how you take it (more or less water, etc.), and I didn’t notice any strong aftertaste. From a general usability standpoint, this checks the boxes I look for in a supplement: good taste, easy mixing, and consistent quality. Thorne also has a strong reputation, and this product feels in line with that in terms of formulation and overall experience. As with any supplement, individual experiences can vary, but from a taste, mixability, and convenience perspective, this has worked well for me. Overall, this is a solid option if you’re looking for a magnesium citrate powder that’s easy to take on a regular basis.
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Reviewed in the United States on April 30, 2026

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