---
title: "Ester C 500mg — $524K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/ester-c-500mg"
last_updated: "2026-08-10T07:18:04.221Z"
locale: en
meta:
description: "Niche score 43/100 · $524K/yr market · 90K searches/yr · $19.43 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $524K/yr market · 90K searches/yr · $19.43 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Ester C 500mg — $524K/yr Amazon US Niche (2026) - Flapen"
---
# **ester c 500mg**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 61Growth 19Conversion 100Competition 7Returns 100Price range 68Avg price 86Brand share 0Review moat 23Quality gap 13
**Conversion**
**Incredible****30.1%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$19.43**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$6.63–$33.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Good****$524K**
$524K/yr · 90K searches
**Review moat**
**Bad****7,080.63**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-12.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.8★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****92%**
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, ester c 500mg is a $524K/yr Amazon United States market (90K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Aug–Sep–Oct–Nov. Verdict: Skip it — 43/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ester c 500mg market data**
- **Units sold / yr**
- **30K–40K**
- avg 3,000–4,000/product
- **Revenue / yr**
- **$583K–$777K**
- units × avg price
- **Conversion rate**
- **30.1%**
- **Avg BSR**
- **#476**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **38%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **121 months**
- **Avg seller age**
- **159 days**
## **Competition & brand share**
The top 5 products capture 92% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**3 **—flat
**Sellers**
**35**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**92%**
Top 20: 100%
**Open market**
**0%**
- Ester-C48% - American Health48% - Solgar4% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -12.2% search growth over the last 90 days.
9K7KPrime Day '25Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Sep, Oct, Nov · busiest ÷ quietest = 3.5×
[**Open Trend **](https://flapen.com/research/us/health-household/ester-c-500mg/trend)
## **Top ester c 500mg search terms**
- **ester c 500mg**73K/yr-12.6%27.7% conv. - **ester c 500mg capsules**8K/yr-17.9%22.4% conv. - **ester-c 500mg**4K/yr-4.5%29.9% conv. - **ester c 500 mg**3K/yr-0.6%28.1% conv. - **ester c 500**3K/yr-6.6%25.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/ester-c-500mg/search-terms)
## **Top ester c 500mg 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%$79K30%$157K45%$236K60%$315K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 8 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Ester-C 500 mg 24 Hour Vitamin C Tablets for Immune Support Vitamin C Supplement 90 Count**Ester-C**$6.63**4.8★8,786 rev](https://www.amazon.com/dp/B004X8MJM2) [2**American Health Ester-C with Citrus Bioflavonoids Capsules - Gentle On Stomach Non-Acidic Vitamin C - 500 mg 60 Servings 120 Count**American Health**$13.13**4.8★9,974 rev](https://www.amazon.com/dp/B000OP6VY0) [3**American Health Ester-C with Citrus Bioflavonoids Capsules - 24-Hour Immune Support Gentle On Stomach Non-Acidic Vitamin C - Non-GMO Gluten-Free - 500 mg 240 Count 120 Servings**American Health**$24.69**4.8★9,974 rev](https://www.amazon.com/dp/B000WKSZ7S) [4**Ester-C Vitamin C 1000 mg Coated Tablets Immune System Booster Stomach-Friendly Supplement 120 Count**Ester-C**$14.66**4.7★20,436 rev](https://www.amazon.com/dp/B0013FYHSW) [5**American Health Ester-C Vitamin C 500 mg Coated Tablets Immune System Booster Stomach-Friendly Supplement 225 Count**American Health**$17.53**4.8★1,094 rev](https://www.amazon.com/dp/B0019GTY9W)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Ester-C 500 mg 24 Hour Vitamin C Tablets for Immune Support Vitamin C Supplement 90 Count**Ester-C**$6.63**8,786 rev13y ago](https://www.amazon.com/dp/B004X8MJM2) [**American Health Ester-C Vitamin C 500 mg Coated Tablets Immune System Booster Stomach-Friendly Supplement 225 Count**American Health**$17.53**1,094 rev18y ago](https://www.amazon.com/dp/B0019GTY9W) [**Ester-C Vitamin C 1000 mg Coated Tablets Immune System Booster Stomach-Friendly Supplement 120 Count**Ester-C**$14.66**20,436 rev18y ago](https://www.amazon.com/dp/B0013FYHSW) [**Solgar Ester-C Plus 500 mg Vitamin C (Ascorbate Complex) 250 Vegetable Capsules - Gentle & Non Acidic - Antioxidant & Immune Support - Non GMO Vegan Gluten Free Kosher - 250 Servings**Solgar**$20.11**4,547 rev20y ago](https://www.amazon.com/dp/B00014DNJU) [**American Health Ester-C with Citrus Bioflavonoids Capsules - 24-Hour Immune Support Gentle On Stomach Non-Acidic Vitamin C - Non-GMO Gluten-Free - 500 mg 240 Count 120 Servings**American Health**$24.69**9,974 rev22y ago](https://www.amazon.com/dp/B000WKSZ7S)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Ester-C 500 mg 24 Hour Vitamin C Tablets for Immune Support Vitamin C Supplement 90 Count**Ester-C**$6.63**4.8★**▲ 28%**](https://www.amazon.com/dp/B004X8MJM2) [**Solgar Ester-C Plus 500 mg Vitamin C (Ascorbate Complex) 250 Vegetable Capsules - Gentle & Non Acidic - Antioxidant & Immune Support - Non GMO Vegan Gluten Free Kosher - 250 Servings**Solgar**$20.11**4.8★**— 2%**](https://www.amazon.com/dp/B00014DNJU) [**Ester-C Vitamin C 1000 mg Coated Tablets Immune System Booster Stomach-Friendly Supplement 120 Count**Ester-C**$14.66**4.7★**— 7%**](https://www.amazon.com/dp/B0013FYHSW) [**American Health Ester-C with Citrus Bioflavonoids Capsules - 24-Hour Immune Support Gentle On Stomach Non-Acidic Vitamin C - Non-GMO Gluten-Free - 500 mg 240 Count 120 Servings**American Health**$24.69**4.8★**— 10%**](https://www.amazon.com/dp/B000WKSZ7S) [**Ester-Vitamin C with Citrus Bioflavonoids 500 Milligrams 450 Veg Tabs**American Health**$33.07**4.8★**▼ 12%**](https://www.amazon.com/dp/B006IB7PA8)
**~~View all trending →~~**
## **What buyers say about ester c 500mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Vitamin**23%
*“This vitamin c is really effective”*
**Acid Regulator/Stomach Ache Relief**17%
*“Great and no stomach cramps”*
**Ease Of Chewing/Swallowing**9%
*“EASY TO SWALLOW”*
**Quality-Overall**8%
*“Excellent product”*
**Value For Money**7%
*“Value for money”*
**Regulates Digestion**5%
*“because it does not cause digestive problem like some Vitamin C products do”*
**Advertised Vs Actual Product**5%
*“Does exactly as advertised”*
**Immunity Booster**4%
*“These are great for immune systems”*
**Cold Relief**3%
*“I swear this shortens my cold”*
**Nutritional Content**2%
*“Keep you healthy”*
### **What buyers complain about **
**Size-Overall**25%
*“They are huge”*
**Ease Of Chewing/Swallowing**20%
*“Too big for me to swallow”*
**Vitamin**9%
*“Do not buy vitamins”*
**Heart Health**5%
*“Causing heartburn”*
**Vegan/Organic**5%
*“Not Kosher/Halal”*
**Ingredients-Overall**5%
*“No don't eat maltodextrin”*
**Side Effects**4%
*“I have consumed it for more than 3 weeks”*
**Hard Feel**2%
*“Pills are hard”*
**Dosage**2%
*“Difficult to find the 500mg”*
**Value For Money**2%
*“Waste of money”*
### **Top return reasons **
**Value For Money**50%
**Ingredients-Overall**25%
**Advertised Vs Actual Product**17%
**Side Effects**8%
## **Common questions**
- **Is ester c 500mg profitable to sell on Amazon United States?**
- The niche generates $524K/yr across 8 tracked products. 90-day search growth is -12.2%. Flapen's verdict: Skip it (43/100).
- **How competitive is the ester c 500mg niche?**
- 3 brands and 35 sellers compete. The top 5 products take 92% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in ester c 500mg?**
- Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Vitamin. The return rate is 0.0%.
- **When does demand for ester c 500mg peak?**
- Demand peaks in Aug–Sep–Oct–Nov; the busiest month runs 3.5× the quietest.
- **What does it cost to enter the ester c 500mg niche?**
- Listings span $6.63–$33.07; the average listing price is $19.43 (sweet spot $15–$100). The average incumbent carries 7,081 reviews — the moat a new listing must climb.
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