COSRX The Vitamin C 13 Serum Reviews

Name: The Vitamin C 13 Serum
Brand: COSRX
Rating: 4.43 (556 reviews)

COSRXThe Vitamin C 13 Serum

4.43

337

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556 Reviews

wi********

May 8, 2025 (UTC)

Dry SkinSensitive SkinBrightening/Dark SpotsWrinkles/Elasticity

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This review was written by The Hwahae Testers who received the product for free and evaluated it with a sense of representing Hwahae. The review is completely unbiased and honest, with no guidelines or restrictions. Reviews by The Hwahae Testers undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

Pros

After using a retinol ampoule at night and applying only basic skincare products in the morning after cleansing, people I meet have been saying my face looks darker. I thought retinol might not suit me, so I've been using this product with a lower vitamin C concentration of 13%. Initially, I was worried about irritation (since vitamin C is acidic and can cause sensitivity), so I applied a skin booster before trying the vitamin C for one day. I didn't experience any irritation, so from the second day onwards, I've been applying it multiple times on bare skin after cleansing, using a rolling motion. It's been a week now, and I haven't felt any tingling or irritation. The absorption is good, and I appreciate that they seem to have added vitamin E to prevent easy oxidation. Also, while vitamin C is said to dry out the face, this doesn't cause any dryness or deep dryness, possibly due to the hyaluronic acid content, which I also like.

Cons

It's been a week since I started using it, and while I don't have any eye irritation or eye pain, I can see two blemishes that look like red pimples on my face. They're not itchy or stinging though.

Tip

I apply this instead of toner after cleansing. Since it's recommended to leave some time before applying emulsion, I roll it on and layer it multiple times.

Recommended

gi******

May 4, 2025 (UTC)

Dehydrated SkinBrightening/Dark SpotsSebum/BlackheadsDead Skin Cells

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Reviewed by The Hwahae Testers

Pros

I've been using this as part of my night care routine 4-5 times a week for about 5 weeks. Previously, I had used a high-concentration product from the same line, I think it was 23%. I generally have resilient skin and rarely feel irritation from skincare products, but that high-concentration vitamin product did cause some irritation, so I opted for this lower concentration version. Unlike the high-concentration product, this one definitely didn't irritate my skin. For me, it wasn't just less irritating - it felt completely non-irritating. Plus, while subtle, it did have a positive effect on my blemish marks.

Cons

Naturally, since the concentration is lower than what I used before, I didn't notice as significant an effect on blemish marks. The high-concentration product almost completely eliminated my blemish marks, but this one just fades them slightly. As a result, while lighter marks became faint enough to cover with foundation, I still need concealer for darker marks. Personally, I'd rather use the high-concentration product despite the irritation than use this lower concentration again. Also, I'm not sure if it's just me, but while pure Vitamin C seems effective on blemish marks, I don't feel it brightens my overall complexion, and I didn't notice any overall brightening with this product either. If you're looking for a product to make your skin tone more radiant, you might want to consider other options.

Recommended

ym*****

May 4, 2025 (UTC)

Dry SkinSensitive SkinAcne SkinEnlarged PoresRedness

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Reviewed by The Hwahae Testers

Pros

I only apply this when I'm at home. I use it after my vitamin serum and before my niacinamide ampoule. It's working well for me!

Cons

There's nothing particularly disappointing about it. I don't usually apply it before makeup though, as it tends to cause pilling.

Recommended

an****

May 4, 2025 (UTC)

Dry SkinSensitive SkinAcne SkinBrightening/Dark SpotsSebum/BlackheadsInner DrynessWrinkles/ElasticityEnlarged PoresDead Skin Cells

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Reviewed by The Hwahae Testers

Pros

This product has the best absorption of any I've tried so far. It's perfect for morning use, gentle on the skin without any tingling sensation, making it comfortable to apply. I'd recommend it to those who dislike sticky textures.

Cons

I was satisfied overall, except for the fact that you need to use it diligently due to the potential browning of vitamin C, which is a characteristic of the ingredient.

Tip

If you apply a generous amount of hydrating serum, it can also help combat deep dryness.

Recommended

jo******

May 2, 2025 (UTC)

Dehydrated SkinSensitive SkinAcne SkinEnlarged PoresRedness

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Pros

It quickly reduces redness on post-acne marks after just four days of use.

Cons

The scent is quite strong, so those with sensitive noses should take note.

Recommended

a4*******

Apr 30, 2025 (UTC)

Combination SkinAcne Skin

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Reviewed by The Hwahae Testers

Pros

I've been using this consistently. I started using it for brightening effects, and while I'm not sure about the brightening, at least my skin hasn't gotten worse.

Cons

The scent... oh my, it's really not good. I don't think I could use this again, even if I wanted to, because of the fragrance.

hw********

Apr 28, 2025 (UTC)

Oily SkinAcne SkinSebum/BlackheadsDark CirclesInner DrynessEnlarged Pores

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Pros

When applied, you can definitely feel your skin becoming firmer and more elastic. I'll make sure to use it consistently.

Cons

The main downside is the small amount of product. Also, be careful around the eyes as it can cause a tingling sensation, so apply with caution in that area.

Recommended

im***

Apr 27, 2025 (UTC)

Dry SkinAtopic SkinBrightening/Dark SpotsDark CirclesInner DrynessWrinkles/Elasticity

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Reviewed by The Hwahae Testers

Pros

This is a great introduction to vitamin C products. I didn't notice much difference at first since I look in the mirror every day, but my husband suddenly asked why my skin looked so radiant. I'm planning to buy a few more bottles.

Cons

I use it generously morning and night, so for me, the amount is a bit insufficient. There's some tingling, but by using small amounts over a day or two, I managed to finish a whole bottle without any major blemishes.

Tip

When I use it after my galvanic device and before putting on an LED mask, it absorbs well and my skin really develops an Inner Glow. It's like I don't even need to go to an esthetician anymore.

Recommended

hy********

Apr 25, 2025 (UTC)

Combination SkinAcne SkinBrightening/Dark SpotsSebum/BlackheadsDark CirclesInner DrynessEnlarged Pores

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Reviewed by The Hwahae Testers

Pros

An excellent product for pigmentation issues. While I often apply vitamin-rich products at night due to sun sensitivity, I learned it's more effective when used during the day. As a result, my uneven skin tone has significantly improved.

Cons

On days when I have a lot of blemishes, it can cause a tingling sensation. I guess that's unavoidable.

Recommended

jh*****

Apr 19, 2025 (UTC)

Dehydrated SkinSensitive SkinEnlarged Pores

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Reviewed by The Hwahae Testers

Pros

I'm using this product with hopes of seeing brightening effects and blemish reduction

Cons

If you expect to see results after just one use, that would be problematic

Recommended