---
title: "Vitamin C Serum Korean — $718K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/beauty-personal-care/vitamin-c-serum-korean"
last_updated: "2026-08-09T15:34:03.554Z"
locale: en
meta:
description: "Niche score 48/100 · $718K/yr market · 420K searches/yr · $22.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $718K/yr market · 420K searches/yr · $22.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Vitamin C Serum Korean — $718K/yr Amazon US Niche (2026) - Flapen"
---
# **vitamin c serum korean**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 69Growth 34Conversion 77Competition 3Returns 96Price range 95Avg price 94Brand share 0Review moat 33Quality gap 37
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Price range**
**Incredible****$18.36–$28.74**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$22.58**
avg listing price — sweet spot $15–$100
**Conversion**
**Great****7.6%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$718K**
$718K/yr · 420K searches
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Growth**
**Okay****+7.1%**
90-day search growth — must beat 0% to launch
**Review moat**
**Okay****3,164.83**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****97%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, vitamin c serum korean is a $718K/yr Amazon United States market (420K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Feb–Mar–Oct–Nov–Dec. Verdict: Skip it — 48/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **vitamin c serum korean market data**
- **Units sold / yr**
- **30K–40K**
- avg 6,000–8,000/product
- **Revenue / yr**
- **$677K–$903K**
- units × avg price
- **Conversion rate**
- **7.6%**
- **Avg BSR**
- **#361**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **50%**
- **Out of stock**
- **32.3%**
- **Avg brand age**
- **53 months**
- **Avg seller age**
- **126 days**
## **Competition & brand share**
The top 5 products capture 97% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**2 **—flat
**Sellers**
**13**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**97%**
Top 20: 100%
**Open market**
**0%**
- Dr.Althea56% - GOODAL44%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +7.1% search growth over the last 90 days.
70K50KSpike '24Holiday '24Spike '25Prime Day '25Black Friday '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Feb, Mar, Oct, Nov, Dec · busiest ÷ quietest = 3.5×
[**Open Trend **](https://flapen.com/research/us/beauty-personal-care/vitamin-c-serum-korean/trend)
## **Top vitamin c serum korean search terms**
- **dr althea vitamin c**154K/yr+0.0%5.8% conv. - **goodal vitamin c serum**61K/yr+0.8%8.6% conv. - **goodal green tangerine vita c dark spot serum**26K/yr+34.8%7.9% conv. - **goodal vitamin c**17K/yr+14.3%8.5% conv. - **dr althea vitamin c serum**18K/yr+33.2%5.5% conv. - **vitamin c korean**21K/yr-5.1%0.9% conv. - **vitamina c dr althea**11K/yr+59.6%2.2% conv. - **goodall vitamin c serum**13K/yr+39.5%9.6% conv. - **green tangerine vita c dark spot serum**17K/yr-4.7%8.2% conv. - **vitamin c dr althea**9K/yr+40.3%5.1% conv. [**All search terms **](https://flapen.com/research/us/beauty-personal-care/vitamin-c-serum-korean/search-terms)
## **Top vitamin c serum korean products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%15%$108K30%$215K45%$323K60%$431K1K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Dr.Althea Vitamin C Boosting Serum | Tranexamic acid (TXA) & Niacinamide to Helps Remove Dark Spots & Uneven Skin Tone | Daily Face Serum for All Skin Types | Korean Vegan Skin Care**Dr.Althea**$20.79**4.6★3,105 rev](https://www.amazon.com/dp/B0DGLCRZZ3) [2**GOODAL Vitamin C Brightening Serum ALPHA | 5% Niacinamide & Exosome for Dark Spot Care | Gentle Daily Facial Serum for Radiant Glow Skin | Green Tangerine | Korean Skincare | 1.01 fl oz (30ml)**GOODAL**$18.53**4.5★5,209 rev](https://www.amazon.com/dp/B0GGGCV238) [3![GOODAL Green Tangerine Vitamin C Cream [Advanced Ver.] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml](https://m.media-amazon.com/images/I/31NMr0AZ2VL.jpg)**GOODAL Green Tangerine Vitamin C Cream \[Advanced Ver.\] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml**GOODAL**$18.36**4.5★1,321 rev](https://www.amazon.com/dp/B0GGM7V79C) [4**GOODAL Green Tangerine Vita C 15 Ampoule Korean Skin Care Vitamin C Serum Hydrating Daily Facial Care for Fine Lines Dull Skin K Beauty 16g/0.56 Oz**GOODAL**$25.70**4.5★1,040 rev](https://www.amazon.com/dp/B09VK94MSL) [5**Dr.Althea Vitamin C Boosting Serum | Daily Vitamin C Serum for All Skin Types | Helps Remove Dark Spots & Uneven Skin Tone | Korean Vegan Skincare (DISCONTINUED)**Dr.Althea**$28.74**4.6★3,105 rev](https://www.amazon.com/dp/B0C1MZ3RPH)
**~~View all top sellers →~~**
### **Newest**
by launch date
[![GOODAL Green Tangerine Vitamin C Cream [Advanced Ver.] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml](https://m.media-amazon.com/images/I/31NMr0AZ2VL.jpg)**GOODAL Green Tangerine Vitamin C Cream \[Advanced Ver.\] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml**GOODAL**$18.36**1,321 rev6mo ago](https://www.amazon.com/dp/B0GGM7V79C) [**GOODAL Vitamin C Brightening Serum ALPHA | 5% Niacinamide & Exosome for Dark Spot Care | Gentle Daily Facial Serum for Radiant Glow Skin | Green Tangerine | Korean Skincare | 1.01 fl oz (30ml)**GOODAL**$18.53**5,209 rev6mo ago](https://www.amazon.com/dp/B0GGGCV238) [**GOODAL Green Tangerine Vita C 15 Ampoule Korean Skin Care Vitamin C Serum Hydrating Daily Facial Care for Fine Lines Dull Skin K Beauty 16g/0.56 Oz**GOODAL**$23.40**5,209 rev1y ago](https://www.amazon.com/dp/B0F2S5MTFN) [**Dr.Althea Vitamin C Boosting Serum | Tranexamic acid (TXA) & Niacinamide to Helps Remove Dark Spots & Uneven Skin Tone | Daily Face Serum for All Skin Types | Korean Vegan Skin Care**Dr.Althea**$20.79**3,105 rev1y ago](https://www.amazon.com/dp/B0DGLCRZZ3) [**Dr.Althea Vitamin C Boosting Serum | Daily Vitamin C Serum for All Skin Types | Helps Remove Dark Spots & Uneven Skin Tone | Korean Vegan Skincare (DISCONTINUED)**Dr.Althea**$28.74**3,105 rev3y ago](https://www.amazon.com/dp/B0C1MZ3RPH)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**GOODAL Green Tangerine Vita C 15 Ampoule Korean Skin Care Vitamin C Serum Hydrating Daily Facial Care for Fine Lines Dull Skin K Beauty 16g/0.56 Oz**GOODAL**$23.40**4.5★**▲ 90%**](https://www.amazon.com/dp/B0F2S5MTFN) [**GOODAL Vitamin C Brightening Serum ALPHA | 5% Niacinamide & Exosome for Dark Spot Care | Gentle Daily Facial Serum for Radiant Glow Skin | Green Tangerine | Korean Skincare | 1.01 fl oz (30ml)**GOODAL**$18.53**4.5★**▲ 87%**](https://www.amazon.com/dp/B0GGGCV238) [![GOODAL Green Tangerine Vitamin C Cream [Advanced Ver.] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml](https://m.media-amazon.com/images/I/31NMr0AZ2VL.jpg)**GOODAL Green Tangerine Vitamin C Cream \[Advanced Ver.\] Vitamin C Cream with 5% Niacinamide | Fades Dark Spots Boosts Radiance & Hydrates | Korean Skincare 1.69oz / 50ml**GOODAL**$18.36**4.5★**▲ 34%**](https://www.amazon.com/dp/B0GGM7V79C) [**Dr.Althea Vitamin C Boosting Serum | Daily Vitamin C Serum for All Skin Types | Helps Remove Dark Spots & Uneven Skin Tone | Korean Vegan Skincare (DISCONTINUED)**Dr.Althea**$28.74**4.6★**— 9%**](https://www.amazon.com/dp/B0C1MZ3RPH) [**GOODAL Green Tangerine Vita C 15 Ampoule Korean Skin Care Vitamin C Serum Hydrating Daily Facial Care for Fine Lines Dull Skin K Beauty 16g/0.56 Oz**GOODAL**$25.70**4.5★**▼ 18%**](https://www.amazon.com/dp/B09VK94MSL)
**~~View all trending →~~**
## **What buyers say about vitamin c serum korean**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Suitability Combination Skin**28%
*“still effective, which is perfect if you have sensitive skin”*
**Quality-Overall**11%
*“Top quality serum”*
**Soft Feel**6%
*“its very gentle”*
**Symptom Reduction**5%
*“it's done an amazing job at lightening said spots”*
**Brightness/Shine/Glow**5%
*“makes your skin glow”*
**Suitability Dry Skin**4%
*“it also leaves you feeling hydrated”*
**Weight Light**4%
*“It's clean lightweight”*
**Smell**4%
*“it smells good”*
**Moist/Dry**4%
*“my face feel moisturizing”*
**Value For Money**3%
*“love the price”*
### **What buyers complain about **
**Allergies**11%
*“this item made me break out almost like an allergic reaction”*
**Functionality-Overall**10%
*“Didn't do anything for my spots”*
**Symptom Reduction**8%
*“I didnt see dramatic brightening or acne changes”*
**Adhesion/Stickiness**8%
*“it feels sticky”*
**Sensitivity-Overall**5%
*“Not good for my sensitive skin”*
**Moist/Dry**4%
*“I dont find it moisturizing”*
**Skin Health**4%
*“I think it might be irritating my skin”*
**Oily/Greasy**4%
*“it was so GREASY”*
**Wrinkles**3%
*“Left me with tiny bumps on my face all the time I used it”*
**Value For Money**3%
*“expensive”*
### **Top return reasons **
**Functionality-Overall**13%
**Value For Money**12%
**Advertised Vs Actual Product**9%
**Smell**8%
**Suitability Combination Skin**5%
**Leak-Proof**5%
**Texture/Consistency-Overall**4%
**Skin Health**4%
**Moist/Dry**3%
**Size-Overall**3%
## **Common questions**
- **Is vitamin c serum korean profitable to sell on Amazon United States?**
- The niche generates $718K/yr across 6 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is +7.1%. Flapen's verdict: Skip it (48/100).
- **How competitive is the vitamin c serum korean niche?**
- 2 brands and 13 sellers compete. The top 5 products take 97% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in vitamin c serum korean?**
- Top complaints mined from reviews: Allergies, Functionality-Overall, Symptom Reduction. The return rate is 0.9%.
- **When does demand for vitamin c serum korean peak?**
- Demand peaks in Jan–Feb–Mar–Oct–Nov–Dec; the busiest month runs 3.5× the quietest.
- **What does it cost to enter the vitamin c serum korean niche?**
- Listings span $18.36–$28.74; the average listing price is $22.58 (sweet spot $15–$100). The average incumbent carries 3,165 reviews — the moat a new listing must climb.
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