---
title: "D3 — $6.2M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/d3"
last_updated: "2026-08-11T03:36:00.892Z"
locale: en
meta:
description: "Niche score 57/100 · $6.2M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Aug 2026."
"og:description": "Niche score 57/100 · $6.2M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Aug 2026."
"og:title": "D3 — $6.2M/yr Amazon US Niche (2026) - Flapen"
---
# **d3**
**Worth a look**
Shows searches that convert (19.7% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 99Growth 22Conversion 100Competition 51Returns 100Price range 69Avg price 60Brand share 36Review moat 0Quality gap 14
**Conversion**
**Incredible****19.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Market size**
**Incredible****$6.2M**
$6.2M/yr · 2.4M searches
**Price range**
**Good****$6.34–$34.70**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$13.18**
avg listing price — sweet spot $15–$100
**Competition**
**Good****54%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****84%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-6.8%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.8★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****51,700.3**
avg incumbent reviews — the moat a new listing must climb
According to Flapen's Amazon United States niche tracking, d3 is a $6.2M/yr Amazon United States market (2.4M searches/yr). The top 5 brands hold 84% of demand. Demand peaks in Jan. Verdict: Worth a look — 57/100.
Data updated Aug 5, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **d3 market data**
- **Units sold / yr**
- **400K–500K**
- avg 15,000–20,000/product
- **Revenue / yr**
- **$5.3M–$6.6M**
- units × avg price
- **Conversion rate**
- **19.7%**
- **Avg BSR**
- **#53**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **89%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **81 months**
- **Avg seller age**
- **145 days**
## **Competition & brand share**
The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **—flat
**Sellers**
**191**
**Top-5 brand share**
**84%**
Top 20: 100%
**Top-5 click share**
**54%**
Top 20: 93%
**Open market**
**14%**
- Nature Made31% - NatureWise21% - Nature's Bounty12% - NOW Foods11% - Bronson10% - Nutricost3% - Open — no brand owns it (9 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 100 weeks — -6.8% search growth over the last 90 days.
80K60KBlack Friday '24Spike '25Prime Day '25 seasonDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/health-household/d3/trend)
## **Top d3 search terms**
- **vitamin d3 5000 iu**1.0M/yr-5.5%16.9% conv. - **d3 vitamin**492K/yr-2.3%14.6% conv. - **vitamin d 5000 iu**193K/yr-18.6%15.4% conv. - **d3 5000 iu**107K/yr+6.5%20.8% conv. - **now vitamin d3**95K/yr+1.8%14.8% conv. - **vitamin d 5000**73K/yr+2.6%14.5% conv. - **vitamin d3 5000**60K/yr+6.6%13.2% conv. - **vitamin d for women**39K/yr-11.3%4.9% conv. - **d3 5000**29K/yr+12.6%13.8% conv. - **d3 vitamin 5000 iu**47K/yr+1.1%13.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/d3/search-terms)
## **Top d3 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%5%$312K10%$624K15%$935K20%$1.2M1K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NatureWise Vitamin D3 5000IU Supplement Immune Support 360 Mini Softgels**NatureWise**$13.60**4.7★195,696 rev](https://www.amazon.com/dp/B00GB85JR4) [2**Nature Made Vitamin D3 5000 IU (125 mcg) 180 Vitamin D Softgels**Nature Made**$13.36**4.8★67,638 rev](https://www.amazon.com/dp/B008GC9T6A) [3**Bronson Vitamin D3 5000iu (125mcg) Non-GMO Gluten-Free Soy-Free 360 Tablets**Bronson**$9.54**4.8★2,941 rev](https://www.amazon.com/dp/B0BXLTXFTS) [4**Natures Bounty Vitamin D3 5000 IU Softgels 240 Count**Nature's Bounty**$14.74**4.8★83,838 rev](https://www.amazon.com/dp/B00DN4VCA2) [5**NOW Foods Supplements Vitamin D-3 5 000 IU High Potency Structural Support* 240 Softgels**NOW Foods**$11.61**4.8★51,526 rev](https://www.amazon.com/dp/B0032BH76O)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**VITBOOST Vitamin D3 K2 Complex - 5000 IU (125 mcg) D3 & K2 (MK-7) 90 mcg**VITBOOST**$9.60**2,706 rev1y ago](https://www.amazon.com/dp/B0DQDDMLXL) [**Bronson Vitamin D3 5000iu (125mcg) Non-GMO Gluten-Free Soy-Free 360 Tablets**Bronson**$9.54**2,941 rev3y ago](https://www.amazon.com/dp/B0BXLTXFTS) [**Vitamatic Vitamin D3 5000 IU (125 mcg) 500 Softgels Made in USA**Vitamatic**$9.86**2,374 rev3y ago](https://www.amazon.com/dp/B0BSVZXTGJ) [**NatureWise Vitamin D3 5000IU Supplement Bone & Immune Health 30 Softgels**NatureWise**$6.34**195,696 rev5y ago](https://www.amazon.com/dp/B093N7JJYL) [**Nature Made Vitamin D3 5000 IU (125 mcg) 360 Vitamin D Softgels**Nature Made**$26.47**67,638 rev6y ago](https://www.amazon.com/dp/B0828JGTXB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**VITBOOST Vitamin D3 K2 Complex - 5000 IU (125 mcg) D3 & K2 (MK-7) 90 mcg**VITBOOST**$9.60**4.8★**▲ 83%**](https://www.amazon.com/dp/B0DQDDMLXL) [**Bronson Vitamin D3 5000iu (125mcg) Non-GMO Gluten-Free Soy-Free 360 Tablets**Bronson**$9.54**4.8★**▲ 54%**](https://www.amazon.com/dp/B0BXLTXFTS) [**Nature Made Vitamin D3 5000 IU (125 mcg) 90 Vitamin D Softgels**Nature Made**$8.67**4.8★**▲ 38%**](https://www.amazon.com/dp/B0037LOLKY) [**Nature Made Vitamin D3 5000 IU (125 mcg) 360 Vitamin D Softgels**Nature Made**$26.47**4.8★**▲ 33%**](https://www.amazon.com/dp/B0828JGTXB) [**Nature Made Vitamin D3 1000 IU (25 mcg) 180 Vitamin D Softgels**Nature Made**$8.67**4.8★**▲ 29%**](https://www.amazon.com/dp/B004U3Y8SI)
**~~View all trending →~~**
## **What buyers say about d3**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Vitamin**24%
*“Quality vitamin”*
**Quality-Overall**19%
*“the quality feels consistent”*
**Value For Money**12%
*“Fair price”*
**Ease Of Chewing/Swallowing**7%
*“Ease swallow”*
**Advertised Vs Actual Product**7%
*“Exactly as advertised”*
**Efficiency**3%
*“Works well”*
**Ease Of Use**3%
*“Easy to Take”*
**Dosage**2%
*“The dose and quantity are good”*
**Nutritional Content**2%
*“I have stayed healthy”*
**Energy Level**1%
*“Boost your energy”*
### **What buyers complain about **
**Vitamin**13%
*“Not normal vitamin smell, more rancid”*
**Size-Overall**8%
*“Its a tiny capsule”*
**Dosage**7%
*“Too high of a dose for me”*
**Value For Money**6%
*“Not worth the price”*
**Advertised Vs Actual Product**3%
*“Very misleading”*
**Side Effects**3%
*“Caused terrible diarrhea and headaches”*
**Quality-Overall**3%
*“Terrible product”*
**Smell**3%
*“Strong perfume-like smell”*
**Functionality-Overall**3%
*“Cant provide results yet”*
**Ingredients-Overall**2%
*“Ingredients contain soybean oil”*
### **Top return reasons **
**Value For Money**34%
**Vitamin**15%
**Dosage**12%
**Functionality-Overall**7%
**Ingredients-Overall**6%
**Smell**4%
**Adhesion/Stickiness**4%
**Quality-Overall**3%
**Size-Overall**3%
**Vegan/Organic**2%
## **Common questions**
- **Is d3 profitable to sell on Amazon United States?**
- The niche generates $6.2M/yr across 27 tracked products. 90-day search growth is -6.8%. Flapen's verdict: Worth a look (57/100).
- **How competitive is the d3 niche?**
- 15 brands and 191 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 84% of demand.
- **What do buyers complain about in d3?**
- Top complaints mined from reviews: Vitamin, Size-Overall, Dosage. The return rate is 0.0%.
- **When does demand for d3 peak?**
- Demand peaks in Jan; the busiest month runs 1.6× the quietest.
- **What does it cost to enter the d3 niche?**
- Listings span $6.34–$34.70; the average listing price is $13.18 (sweet spot $15–$100). The average incumbent carries 51,700 reviews — the moat a new listing must climb.
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