---
title: "Calcium 600 Mg with Vitamin D3 — $1.3M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/calcium-600-mg-with-vitamin-d3"
last_updated: "2026-08-06T17:10:26.352Z"
locale: en
meta:
description: "Niche score 51/100 · $1.3M/yr market. Brand-locked demand (top 5 brands take 98% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 51/100 · $1.3M/yr market. Brand-locked demand (top 5 brands take 98% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Calcium 600 Mg with Vitamin D3 — $1.3M/yr Amazon US Niche (2026) - Flapen"
---
# **calcium 600 mg with vitamin d3**
**Worth a look**
Shows low returns (0.0%), but brand-locked demand (top 5 brands take 98% of clicks) keeps it on the watch list.
Market size 83Growth 42Conversion 98Competition 15Returns 100Price range 66Avg price 74Brand share 5Review moat 22Quality gap 20
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****16.9%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Great****$1.3M**
$1.3M/yr · 517K searches
**Avg price**
**Good****$14.92**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$6.59–$31.39**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Growth**
**Okay****+13.8%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****9,537.18**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****83%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, calcium 600 mg with vitamin d3 is a $1.3M/yr Amazon United States market (517K searches/yr). The top 5 brands hold 98% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **calcium 600 mg with vitamin d3 market data**
- **Units sold / yr**
- **80K–100K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **$1.2M–$1.5M**
- units × avg price
- **Conversion rate**
- **16.9%**
- **Avg BSR**
- **#201**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **45%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **80 months**
- **Avg seller age**
- **151 days**
## **Competition & brand share**
The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**6 **—flat
**Sellers**
**96**
**Top-5 brand share**
**98%**
Top 20: 100%
**Top-5 click share**
**83%**
Top 20: 100%
**Open market**
**0%**
- Nature Made57% - Nature's Bounty19% - 21st Century12% - Nature's Wonder6% - Pure Encapsulations3% - Generic2% - Open — no brand owns it (0%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +13.8% search growth over the last 90 days.
15K10KSpike '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/calcium-600-mg-with-vitamin-d3/trend)
## **Top calcium 600 mg with vitamin d3 search terms**
- **calcium 600 mg**212K/yr+22.5%14.8% conv. - **calcium 600 mg with vitamin d3**70K/yr+18.4%15.5% conv. - **nature made calcium**64K/yr+5.7%13.0% conv. - **nature made calcium 600 mg with vitamin d3**35K/yr-3.1%24.9% conv. - **calcium 600**15K/yr+0.1%11.5% conv. - **calcium 600mg**15K/yr+10.8%11.6% conv. - **calcium 600 mg with vitamin d**9K/yr+36.3%14.9% conv. - **600 mg calcium**13K/yr-2.8%11.9% conv. - **nature made calcium citrate**12K/yr+5.0%3.1% conv. - **calcium nature made**11K/yr-1.5%14.4% conv. [**All search terms **](https://flapen.com/research/us/health-household/calcium-600-mg-with-vitamin-d3/search-terms)
## **Top calcium 600 mg with vitamin 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%15%$196K30%$392K45%$587K60%$783K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 11 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nature Made Calcium 600 mg with Vitamin D3 Dietary Supplement for Bone Support 220 Tablets**Nature Made**$13.71**4.7★27,324 rev](https://www.amazon.com/dp/B002FH5I0I) [2**Natures Bounty Calcium Carbonate & Vitamin D Supports Immune Health & Bone Health 600mg Calcium & 800IU Vitamin D3 250 Tablets**Nature's Bounty**$10.74**4.7★8,402 rev](https://www.amazon.com/dp/B0012D38G2) [3**21st Century Calcium 600 mg Supplement (400 Tablets) Vegan-Friendly Bone Strength Calcium Supplement Non-GMO & Gluten-Free Calcium Carbonate No Artificial Flavors Suitable for Men & Women**21st Century**$11.90**4.7★6,539 rev](https://www.amazon.com/dp/B00M5TZ1F8) [4**Natures Wonder Calcium 600 mg with Vitamin D3 20 mcg for Bone Health 220 Tablets**Nature's Wonder**$9.89**4.7★660 rev](https://www.amazon.com/dp/B0DD1S75B2) [5**Nature Made Calcium 600 mg with Vitamin D3 Dietary Supplement for Bone Support Calcium Supplement for Bone Health 60 Tablets**Nature Made**$6.59**4.7★27,324 rev](https://www.amazon.com/dp/B0000DJASB)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Natures Wonder Calcium 600 mg with Vitamin D3 20 mcg for Bone Health 220 Tablets**Nature's Wonder**$9.89**660 rev1y ago](https://www.amazon.com/dp/B0DD1S75B2) [**Spring - Valley Calcium 600mg Natural Bone Health Calcium - 100 Tablets Pack of 3**Generic**$30.82**237 rev4y ago](https://www.amazon.com/dp/B09XJKD9FY) [**21st Century Calcium 600 mg Supplement (400 Tablets) Vegan-Friendly Bone Strength Calcium Supplement Non-GMO & Gluten-Free Calcium Carbonate No Artificial Flavors Suitable for Men & Women**21st Century**$11.90**6,539 rev12y ago](https://www.amazon.com/dp/B00M5TZ1F8) [**21st Century Calcium Plus D Supplement Tablet 600 mg 400 Count**21st Century**$15.27**2,838 rev12y ago](https://www.amazon.com/dp/B00IQB6VE4) [**Nature Made Calcium Gummies 500 mg Per Serving with Vitamin D3 Dietary Calcium Supplement for Bone Support 80 Gummies 40 Day Supply**Nature Made**$9.82**4,462 rev13y ago](https://www.amazon.com/dp/B008HEZ6TG)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Natures Wonder Calcium 600 mg with Vitamin D3 20 mcg for Bone Health 220 Tablets**Nature's Wonder**$9.89**4.7★**▲ 32%**](https://www.amazon.com/dp/B0DD1S75B2) [**21st Century Calcium Plus D Supplement Tablet 600 mg 400 Count**21st Century**$15.27**4.7★**▲ 23%**](https://www.amazon.com/dp/B00IQB6VE4) [**Nature Made Calcium 600 mg with Vitamin D3 Dietary Supplement for Bone Support Calcium Supplement for Bone Health 60 Tablets**Nature Made**$6.59**4.7★**▲ 20%**](https://www.amazon.com/dp/B0000DJASB) [**Nature Made Calcium Gummies 500 mg Per Serving with Vitamin D3 Dietary Calcium Supplement for Bone Support 80 Gummies 40 Day Supply**Nature Made**$9.82**4.5★**▲ 10%**](https://www.amazon.com/dp/B008HEZ6TG) [**Natures Bounty Calcium Carbonate & Vitamin D Supports Immune Health & Bone Health 600mg Calcium & 800IU Vitamin D3 250 Tablets**Nature's Bounty**$10.74**4.7★**— 9%**](https://www.amazon.com/dp/B0012D38G2)
**~~View all trending →~~**
## **What buyers say about calcium 600 mg with vitamin d3**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Calcium**18%
*“Calcium works well”*
**Value For Money**15%
*“Great Deal”*
**Quality-Overall**14%
*“always consistent quality”*
**Vitamin**9%
*“Great vitamins”*
**Advertised Vs Actual Product**7%
*“As advertised”*
**Ease Of Chewing/Swallowing**5%
*“The best chewable I've bought in last year”*
**Taste-Overall**4%
*“Taste great”*
**Ease Of Use**4%
*“Ease of use”*
**Joint Pain**2%
*“It is an excellent supplement for bone health”*
**Efficiency**2%
*“Effective product”*
### **What buyers complain about **
**Size-Overall**12%
*“Too Big”*
**Taste-Overall**8%
*“Weird taste”*
**Ease Of Chewing/Swallowing**8%
*“as I can't swallow that type”*
**Sweetness**7%
*“Way too sugary”*
**Calcium**7%
*“Apparently low calcium is a thing”*
**Value For Money**4%
*“Too pricey”*
**Texture/Consistency-Overall**4%
*“Terrible texture”*
**Dosage**4%
*“Content of each is very low per dosage compared to other brands at the same cost”*
**Vitamin**2%
*“Vitamins r too big to swallow”*
**Acid Regulator/Stomach Ache Relief**2%
*“stomach pains”*
### **Top return reasons **
**Calcium**42%
**Vitamin**15%
**Ease Of Chewing/Swallowing**10%
**Magnesium**8%
**Advertised Vs Actual Product**4%
**Size-Overall**4%
**Flavor**4%
**Taste-Overall**4%
**Dosage**4%
**Weight Heavy**4%
## **Common questions**
- **Is calcium 600 mg with vitamin d3 profitable to sell on Amazon United States?**
- The niche generates $1.3M/yr across 11 tracked products. 90-day search growth is +13.8%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the calcium 600 mg with vitamin d3 niche?**
- 6 brands and 96 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in calcium 600 mg with vitamin d3?**
- Top complaints mined from reviews: Size-Overall, Taste-Overall, Ease Of Chewing/Swallowing. The return rate is 0.0%.
- **When does demand for calcium 600 mg with vitamin d3 peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the calcium 600 mg with vitamin d3 niche?**
- Listings span $6.59–$31.39; the average listing price is $14.92 (sweet spot $15–$100). The average incumbent carries 9,537 reviews — the moat a new listing must climb.
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