---
title: "Vitamin D3 4000 Iu — $171K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/vitamin-d3-4000-iu"
last_updated: "2026-08-10T16:44:03.743Z"
locale: en
meta:
description: "Niche score 40/100 · $171K/yr market · 93K searches/yr · $14.35 avg price. Doesn't clear our bar today. Data updated Aug 2026."
"og:description": "Niche score 40/100 · $171K/yr market · 93K searches/yr · $14.35 avg price. Doesn't clear our bar today. Data updated Aug 2026."
"og:title": "Vitamin D3 4000 Iu — $171K/yr Amazon US Niche (2026) - Flapen"
---
# **vitamin d3 4000 iu**
**Skip it**
A deep review moat (90,576 avg reviews) — this niche doesn't clear our bar today.
Market size 35Growth 25Conversion 96Competition 14Returns 100Price range 67Avg price 70Brand share 6Review moat 0Quality gap 19
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.8%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Good****$14.35**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$5.76–$34.10**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Okay****$171K**
$171K/yr · 93K searches
**Growth**
**Bad****-0.7%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****84%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
**Review moat**
**Bad****90,575.7**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, vitamin d3 4000 iu is a $171K/yr Amazon United States market (93K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 40/100.
Data updated Aug 5, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **vitamin d3 4000 iu market data**
- **Units sold / yr**
- **13K–15K**
- avg 1,500–2,000/product
- **Revenue / yr**
- **$179K–$215K**
- units × avg price
- **Conversion rate**
- **12.8%**
- **Avg BSR**
- **#92**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **80%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **92 months**
- **Avg seller age**
- **164 days**
## **Competition & brand share**
The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **—flat
**Sellers**
**69**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**84%**
Top 20: 100%
**Open market**
**0%**
- NatureWise74% - Nature Made8% - WeightWorld8% - Sports Research5% - Pure Encapsulations3% - YounGlo Research3%
## **Demand & seasonality**
Weekly Amazon search volume, last 101 weeks — -0.7% search growth over the last 90 days.
2K2KSpike '25Black Friday '25 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/vitamin-d3-4000-iu/trend)
## **Top vitamin d3 4000 iu search terms**
- **vitamin d3 4000 iu**33K/yr+0.8%10.6% conv. - **vitamin d 4000 iu**31K/yr-7.4%12.2% conv. - **vitamin d 4000**10K/yr-2.2%11.5% conv. - **vitamin d3 4000 iu softgels**7K/yr+51.0%4.4% conv. - **d3 4000 iu**7K/yr-19.0%11.5% conv. - **vitamin d3 4000**5K/yr+10.0%12.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/vitamin-d3-4000-iu/search-terms)
## **Top vitamin d3 4000 iu 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%$26K30%$51K45%$77K60%$103K1001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NatureWise Vitamin D3 4000 IU Supplement Immune Support 360 Mini Softgels**NatureWise**$14.95**4.7★195,696 rev](https://www.amazon.com/dp/B07QBXPT2F) [2**NatureWise Vitamin D3 4000 IU Supplement Immune Support 90 Mini Softgels**NatureWise**$8.65**4.7★195,696 rev](https://www.amazon.com/dp/B0CKFQVNDL) [3**WeightWorld Vitamin D3 4000 IU (100mcg) for Bone Strength Muscle Health & Immune Support | 400 Days Supply | Vegan D3 Vitamin (Cholecalciferol) from Lichen | 400 VIT D3 Tablets Non-GMO Gluten-Free**WeightWorld**$15.59**4.6★23,887 rev](https://www.amazon.com/dp/B086V74KKR) [4**Sports Research Vitamin D3 4000iu/100mcg with Coconut MCT Oil 360 Count**Sports Research**$16.79**4.4★104 rev](https://www.amazon.com/dp/B0CTVP683Q) [5**NatureWise Vitamin D3 4000 IU Supplement Immune Support 200 Mini Softgels**NatureWise**$11.31**4.7★195,696 rev](https://www.amazon.com/dp/B0CKFQPN3R)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Sports Research Vitamin D3 4000iu/100mcg with Coconut MCT Oil 360 Count**Sports Research**$16.79**104 rev2y ago](https://www.amazon.com/dp/B0CTVP683Q) [**NatureWise Vitamin D3 4000 IU Supplement Immune Support 90 Mini Softgels**NatureWise**$8.65**195,696 rev2y ago](https://www.amazon.com/dp/B0CKFQVNDL) [**NatureWise Vitamin D3 4000 IU Supplement Immune Support 200 Mini Softgels**NatureWise**$11.31**195,696 rev2y ago](https://www.amazon.com/dp/B0CKFQPN3R) [**NatureWise Vitamin D3 4000 IU Supplement Immune Support 30 Mini Softgels**NatureWise**$5.76**195,696 rev2y ago](https://www.amazon.com/dp/B0CKFMCLFP) [**Pure Encapsulations Vitamin D3 & K2 120 Capsules**Pure Encapsulations**$34.10**5,090 rev3y ago](https://www.amazon.com/dp/B0BZ8TMDQ5)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**WeightWorld Vitamin D3 4000 IU (100mcg) for Bone Strength Muscle Health & Immune Support | 400 Days Supply | Vegan D3 Vitamin (Cholecalciferol) from Lichen | 400 VIT D3 Tablets Non-GMO Gluten-Free**WeightWorld**$15.59**4.6★**▲ 128%**](https://www.amazon.com/dp/B086V74KKR) [**Pure Encapsulations Vitamin D3 & K2 120 Capsules**Pure Encapsulations**$34.10**4.8★**▲ 32%**](https://www.amazon.com/dp/B0BZ8TMDQ5) [**Nature Made Vitamin D3 2000 IU (50 mcg) 250 Vitamin D Softgels**Nature Made**$12.90**4.8★**▲ 15%**](https://www.amazon.com/dp/B004GJYTF8) [**NatureWise Vitamin D3 4000 IU Supplement Immune Support 90 Mini Softgels**NatureWise**$8.65**4.7★**— 2%**](https://www.amazon.com/dp/B0CKFQVNDL) [**NatureWise Vitamin D3 4000 IU Supplement Immune Support 360 Mini Softgels**NatureWise**$14.95**4.7★**— 6%**](https://www.amazon.com/dp/B07QBXPT2F)
**~~View all trending →~~**
## **What buyers say about vitamin d3 4000 iu**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**25%
*“the quality has been consistent with every purchase”*
**Vitamin**24%
*“Best vitamins”*
**Value For Money**7%
*“Good price”*
**Ease Of Chewing/Swallowing**6%
*“Ease swallow”*
**Ease Of Use**5%
*“easy to use”*
**Advertised Vs Actual Product**4%
*“As described”*
**Efficiency**3%
*“Good Results”*
**Dosage**2%
*“perfect vitamin d dosing”*
**Ingredients-Overall**2%
*“Clean ingredients”*
**Nutritional Content**1%
*“Excellent supplement”*
### **What buyers complain about **
**Vitamin**19%
*“which makes it harder for my body to process certain vitamins”*
**Size-Overall**9%
*“Small capsule size”*
**Allergies**6%
*“I had a reaction starting with this high of a dose”*
**Taste-Overall**5%
*“No taste”*
**Smell**4%
*“These have a strong FISH odor”*
**Quality-Overall**4%
*“Plastic used is low quality and brittle, especially the cap”*
**Value For Money**3%
*“costly”*
**Dosage**3%
*“after researching, it said that high of a dose could become toxic”*
**Side Effects**2%
*“nausea and weird stomach pain”*
**Durability**2%
*“This is my 2nd bottle I purchased that the cap breakd”*
### **Top return reasons **
**Vitamin**27%
**Quality-Overall**18%
**Smell**9%
**Size-Overall**9%
**Functionality-Overall**9%
**Dosage**9%
**Comfort-Overall**9%
**Calcium**9%
## **Common questions**
- **Is vitamin d3 4000 iu profitable to sell on Amazon United States?**
- The niche generates $171K/yr across 10 tracked products. 90-day search growth is -0.7%. Flapen's verdict: Skip it (40/100).
- **How competitive is the vitamin d3 4000 iu niche?**
- 6 brands and 69 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in vitamin d3 4000 iu?**
- Top complaints mined from reviews: Vitamin, Size-Overall, Allergies. The return rate is 0.0%.
- **When does demand for vitamin d3 4000 iu peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the vitamin d3 4000 iu niche?**
- Listings span $5.76–$34.10; the average listing price is $14.35 (sweet spot $15–$100). The average incumbent carries 90,576 reviews — the moat a new listing must climb.
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