Name: AMPOULE SERUM [VITAMIN]
Brand: TWENTYKEI
Rating: 4.56 (352 reviews)

Rich and earthy shades like mustard yellow, olive green, and chocolate brown look great on you

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Bright and fresh shades like coral, warm pinks, and fresh greens look great on you

Soft and muted shades like pastel blues, dusty pinks, and soft lavenders look great on you

High-contrast and bold shades like pure white, black, icy blues, and deep reds look great on you

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This is a Health Functional Food certified by the Ministry of Food and Drug Safety (MFDS) of Korea, designed to help maintain and improve your health.

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.

Each ingredient is selected for its specific purpose, such as improving skin hydration or brightening. However, the inclusion of these ingredients does not guarantee the overall effectiveness of the final product. Simply using these ingredients does not ensure the product will deliver the claimed benefits.

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트웬티케이

AMPOULE SERUM [VITAMIN]

Causes Allergic Reactions

Not Effective for Inner Dryness

Contains Artificial Fragrance

May Cause Eye Irritation

Disrupts Oil-Moisture Balance

Scent Fades Quickly

Not Effective for Exfoliation

Pleasant Scent

Easily Absorbed

Easy to Apply

Not Sticky

Subtle Scent

Has a Brightening Effect

Boosts Radiance

Before moving on from the basic skincare routine to the serum, I first spray on a mist.
Then I dry my hair and proceed to the serum step of the routine. This helps prevent my makeup from creasing or wearing off, which is great.

There are no troubles, and it's a whitening product, but it also has good moisture, so I couldn't find any downsides.

First, I was satisfied with the capacity at this price.🙂
Since the price was reasonable for me, I was drawn to this product and decided to purchase it.
When I tested it on the back of my hand, 
I first smelled the fragrance, and it had a refreshing citrus scent.😍🫣 I really liked the refreshing fragrance, which is my favorite.
Since the other creams or serums I'm currently using are unscented, I felt the fragrance of this product was quite distinctive and I really enjoyed it. And the application was not too quickly absorbed, but had a lingering feel on the skin.~~
The texture was not too heavy, but not too watery either, with a slightly oily feel.🫠
Since it's not heavy, I think it will be great to use in the summer.
Although I've only been using it for about 3 days and left this review, I'm not sure about the whitening effects yet, but I feel it's doing a good job of maintaining moisture without causing any facial issues.
I think I will continue using it until the end.😗

비타민C 미백 앰플

Immediately applying skincare after cleansing is recommended.

All skin types may not suit it, but I recommend it.

It had a smooth and creamy application! I could feel it becoming refreshing and moisturizing.

I found it works even better when applied after essence or serum, rather than immediately after toner in your morning and evening skincare routine.

The price is a tiiiny bit high for the amount you get.
But since it's effective, I'll likely continue using it.

Application: Good
Absorption: Excellent
Recommended skin type: All skin types

I've been using this product morning and night for 5 days, from April 30, 2025, to May 4.
It comes with a dropper, and although the formula is thin, it doesn't run excessively.
With a 60ml volume, I feel I can use it for a long time without worry.
My skin texture has become incredibly smooth.
I'm not sure if my complexion has noticeably brightened yet,
but I definitely noticed an improvement in skin texture within a day or two.
I think I need to use it consistently for about another week.
You know how important it is to apply vitamin C regularly, right?
I highly recommend this product!!!

Due to the nature of vitamin products, there's a risk of oxidation when exposed to air.

■ Absorbs well

The ampoule's texture is lightweight and spreads smoothly, effortlessly sinking into the skin without rubbing. While not watery, it's almost non-sticky, making application comfortable. A small amount covers the entire face evenly, resulting in a satisfying user experience.

■ Absorption

It leaves no residue on the skin, finishing cleanly. After absorption, it maintains long-lasting hydration without deep dryness. Particularly suitable as a daily product, as it doesn't cause pilling even when used before makeup in the morning.

■ Recommended Skin Types

Combination/Oily Skin: Thanks to its fresh finish, it seems suitable for use on skin with excess oil without feeling heavy.

I didn't find any drawbacks. I didn't experience any blemishes while using it. However, those looking for a richer formula might find it a bit lacking.

The product applies smoothly and has a refreshing texture, which is a great advantage. It's perfect for summer use.

The dropper feels a bit unhygienic to use. I think a pump dispenser would be better.

I love how it's not sticky and feels so clean. It's perfect for daily use!

When used together with a regenerating cream, I noticed enhanced effects in calming redness and quickly soothing my skin.

I think most people expect vitamin serums to brighten their complexion, but I didn't see much improvement in that area.

(Review after using the product won from the Hwahae Testers)

This was my first time trying a skincare product with vitamin C, and I think it's a great option for beginners. First off, the scent when I opened the product was so pleasant that it made me want to use it consistently. When applied, there's no irritation - it goes on smoothly and absorbs well. After application, my skin feels soft and velvety to the touch. I saw noticeable effects in calming redness.

Personally, I apply this ampoule generously after using Riddle Shot, then finish with a wrapping mask. This method allows the beneficial ingredients of the vitamin ampoule to fully penetrate the skin, effectively brightening and hydrating. If you don't have sensitive skin that reacts to Riddle Shot, I highly recommend trying this routine!

There weren't many downsides to speak of. However, if you have extremely dry skin, using this alone might not be enough. I'd suggest pairing it with a cream or emulsion for best results!

I bought this after a friend recommended it, and I'm so glad I did! Even for my dry skin, it was wonderfully hydrating and absorbed quickly without any stickiness. The scent is a delightful blend of yuzu and lemon, giving it a vitamin C-rich vibe that made me trust it even more. It didn't cause any significant irritation, so it seems suitable for all skin types!

I'd recommend this for summer due to its lightweight feel. It might feel a bit too light in winter, but layering it with a cream should solve that issue.

I got the chance to try Twenty Key's Vitamin Ampoule through a survey panel win! Though there was no obligation to review, I'm voluntarily sharing my thoughts because it's so lightweight and pleasant to use.

The formula is light, making it perfect for summer use. Unlike some other vitamin serums, it doesn't cause any irritation, so it's gentle and easy to incorporate into your routine. I'm almost finished with it now, and I've noticed it's helped improve my complexion too!

There's nothing I dislike about this product! I didn't experience any blemishes either!

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. The Hwahae Testers' reviews undergo the same strict verification process as regular reviews, and if they don't meet our standards, revisions will be requested.

I received this product as a winner of The Hwahae Testers program from January 10th to 17th. I've never purchased a vitamin ampoule separately before, but after trying it this time, I noticed my face definitely seemed a bit brighter. The amount is quite generous, so I've continued using it even after the review period, and I'm loving it! What I appreciate most is how it hydrates and brightens my complexion.

▪️A hydrating or moisturizing cream is essential to use with this product.

▪️Moisturizing power - Low
While it provides hydration, it lacks oil content, so it's not very moisturizing. You'll need to follow up with an emulsion or cream.

▪️Radiance - Below average
Brightening products often take time to show results, and since this is quite a light formula, you might not notice an immediate glow.

▪️Absorption - High
▪️Irritation - Low
A yellow-tinted serum with a gel-like consistency. One pump is enough to cover the entire face.
Glides on smoothly without any irritation.
Unlike other vitamin or brightening serums that can feel sticky, this one doesn't have that sensation at all.

▪️Scent
The fragrance is oddly familiar... Ah, it reminds me of Ssaek Ssaek orange candy!
It's a pleasantly nostalgic scent that makes application enjoyable every time.

▪️Hydration - High
Applies with a fresh and moisturizing feel.

▪️Makeup compatibility - High
No pilling or greasiness, and minimal makeup breakdown.

▪️Skin texture improvement - Above average
After use, skin feels smoother and appears slightly clearer.

#Noticeably improves skin tone on hands or elbows
  Quick results possible
#Seems to slightly lighten under-eye dark circles when applied there

#Slightly lacking in hydration and richness when used alone

#Refreshing citrus scent
#Convenient size that fits in one hand
#Generous amount dispensed per pump
#Light yellow flowing texture
#Feels like 90% hydration, 10% oil - moisturizing effect is short-lived
#No dramatic whitening effect, but gives a clear, refreshed complexion like after a good night's sleep
#Immediate brightening effect visible on hands or other body parts
#No irritation, leaves skin feeling slightly firm after use
#Expectation that consistent use will maintain a clear complexion

Korean Reviews

AMPOULE SERUM [VITAMIN]

2 Reviews