---
title: "Oyster Shell Calcium 500mg — $80K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/oyster-shell-calcium-500mg"
last_updated: "2026-08-07T09:42:45.180Z"
locale: en
meta:
description: "Niche score 47/100 · $80K/yr market · 32K searches/yr · $16.31 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $80K/yr market · 32K searches/yr · $16.31 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Oyster Shell Calcium 500mg — $80K/yr Amazon US Niche (2026) - Flapen"
---
# **oyster shell calcium 500mg**
**Skip it**
Brand-locked demand (top 5 brands take 97% of clicks) — this niche doesn't clear our bar today.
Market size 20Growth 42Conversion 97Competition 27Returns 100Price range 71Avg price 78Brand share 7Review moat 65Quality gap 21
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.3%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$16.31**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$7.00–$34.76**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****886.39**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+13.7%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$80K**
$80K/yr · 32K searches
**Brand share**
**Bad****97%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, oyster shell calcium 500mg is a $80K/yr Amazon United States market (32K searches/yr). The top 5 brands hold 97% of demand. Verdict: Skip it — 47/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **oyster shell calcium 500mg market data**
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$82K–$98K**
- units × avg price
- **Conversion rate**
- **15.3%**
- **Avg BSR**
- **#946**
- **Page quality**
- **0%**
- **Prime**
- **89%**
- **Sponsored**
- **56%**
- **Out of stock**
- **0.5%**
- **Avg brand age**
- **89 months**
- **Avg seller age**
- **152 days**
## **Competition & brand share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **—flat
**Sellers**
**45**
**Top-5 brand share**
**97%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**1%**
- MAJOR54% - Nature's Blend31% - GeriCare7% - MASON NATURAL3% - Pecking Order2% - Organics Ocean2% - Open — no brand owns it (1 brand, 1%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +13.7% search growth over the last 90 days.
800600Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/oyster-shell-calcium-500mg/trend)
## **Top oyster shell calcium 500mg search terms**
- **oyster shell calcium 500mg**14K/yr+5.8%14.5% conv. - **oyster shell calcium**14K/yr+13.5%11.1% conv. - **oyster shell calcium 500mg with vitamin d3**4K/yr+42.1%16.2% conv. [**All search terms **](https://flapen.com/research/us/health-household/oyster-shell-calcium-500mg/search-terms)
## **Top oyster shell calcium 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%10%$8K20%$16K30%$24K40%$32K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (1-Pack)**MAJOR**$11.89**4.7★775 rev](https://www.amazon.com/dp/B005TM2FAM) [2**Major Oyster Shell Calcium with Vitamin D3 500 mg / 5 mcg (200 IU) - Daily Calcium Supplement - 300 Tablets (1 Pack)**MAJOR**$14.53**4.8★1,036 rev](https://www.amazon.com/dp/B005TM1W7Y) [3**Natures Blend Oyster Shell Calcium 500 mg 100 Tabs (1683)**Nature's Blend**$9.55**4.7★586 rev](https://www.amazon.com/dp/B004KWNGAA) [4**Natures Blend Oyster Shell Calcium 500 mg Tablets - 100 ct Pack of 2**Nature's Blend**$17.84**4.7★586 rev](https://www.amazon.com/dp/B073VPFVK4) [5**GeriCare Oyster Shell Calcium 500 mg Bone Health & Strength Nutritional Supplement Supports Muscle Functions 100 Count (Pack of 1)**GeriCare**$7.73**4.7★37 rev](https://www.amazon.com/dp/B0D1RHB882)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Organics Ocean Better Calcium - Organic Red Algae Calcium with Vitamin D3 and K2 Supplements - Supports Bone Structure Joint Comfort & Encourages Healthy Aging - Plant-Based Non-GMO - 1 Pack**Organics Ocean**$34.76**102 rev7mo ago](https://www.amazon.com/dp/B0G7BSTPTR) [**GeriCare Oyster Shell Calcium 500mg + Vitamin D Bone Health Nutritional Supplement Tablets 250 Count (1 Pack)**GeriCare**$10.07**21 rev10mo ago](https://www.amazon.com/dp/B0FPGVJ5PZ) [**Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (2-Pack)**MAJOR**$20.48**775 rev11mo ago](https://www.amazon.com/dp/B0FMLSF6M2) [**Major Oyster Shell Calcium 500 mg - Daily Calcium Supplement - 300 Tablets (3-Pack)**MAJOR**$26.34**775 rev11mo ago](https://www.amazon.com/dp/B0FMLH5YBH) [**MAJOR Oyster Shell Calcium 500mg Tablets with Vitamin D3 200IU (5 mcg) - Gluten-Free Daily Vitamin D Dietary Supplement for Bone Health and Calcium Absorption 150 Count**MAJOR**$12.43**6 rev2y ago](https://www.amazon.com/dp/B0D3MFK81R)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Organics Ocean Better Calcium - Organic Red Algae Calcium with Vitamin D3 and K2 Supplements - Supports Bone Structure Joint Comfort & Encourages Healthy Aging - Plant-Based Non-GMO - 1 Pack**Organics Ocean**$34.76**4.6★**▲ 239%**](https://www.amazon.com/dp/B0G7BSTPTR) [**Natures Blend Oyster Shell Calcium 500 mg + D - 100 Tablets Pack of 2**Nature's Blend**$20.87**4.7★**▲ 160%**](https://www.amazon.com/dp/B00HA73UZI) [**Oyster Shell Calcium with D3 100 Tabs**Nature's Blend**$11.38**4.8★**▲ 159%**](https://www.amazon.com/dp/B004KWI54M) [**GeriCare Oyster Shell Calcium 500mg + Vitamin D Bone Health Nutritional Supplement Tablets 250 Count (1 Pack)**GeriCare**$10.07**4.7★**▲ 97%**](https://www.amazon.com/dp/B0FPGVJ5PZ) [**Natures Blend Oyster Shell Calcium 500 mg Tablets - 100 ct Pack of 2**Nature's Blend**$17.84**4.7★**▲ 79%**](https://www.amazon.com/dp/B073VPFVK4)
**~~View all trending →~~**
## **What buyers say about oyster shell calcium 500mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Calcium**18%
*“Helps keep calcium levels up”*
**Value For Money**15%
*“Good value”*
**Quality-Overall**13%
*“A+ quality”*
**Advertised Vs Actual Product**8%
*“Just as described”*
**Ease Of Chewing/Swallowing**7%
*“Easy for them to eat”*
**Ease Of Use**5%
*“easy to use”*
**Size-Overall**3%
*“good size i think”*
**Taste-Overall**3%
*“Good taste”*
**Absorbency**2%
*“Easily absorbed”*
**Regulates Digestion**2%
*“Easy digest”*
### **What buyers complain about **
**Size-Overall**35%
*“very tiny”*
**Calcium**9%
*“they dont seem to bother me as much as other calcium I tried”*
**Value For Money**6%
*“it is not inexpensive”*
**Dosage**5%
*“cheaper and more pills”*
**Advertised Vs Actual Product**4%
*“False advertising”*
**Ease Of Chewing/Swallowing**4%
*“I choke on it about every three or four times I take it”*
**Ingredients-Overall**4%
*“Unhealthy additives”*
**Heating**3%
*“highly doubt heat treated”*
**Leak-Proof**3%
*“spilled everywhere”*
**Hard Feel**3%
*“The oyster shell are good for the chicken makes the shell harder”*
### **Top return reasons **
**Certifications**33%
**Compatibility-Overall**33%
**Ease Of Chewing/Swallowing**33%
## **Common questions**
- **Is oyster shell calcium 500mg profitable to sell on Amazon United States?**
- The niche generates $80K/yr across 18 tracked products. 1 of 4 products launched in the last 360 days are still selling. 90-day search growth is +13.7%. Flapen's verdict: Skip it (47/100).
- **How competitive is the oyster shell calcium 500mg niche?**
- 7 brands and 45 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 97% of demand.
- **What do buyers complain about in oyster shell calcium 500mg?**
- Top complaints mined from reviews: Size-Overall, Calcium, Value For Money. The return rate is 0.0%.
- **When does demand for oyster shell calcium 500mg peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the oyster shell calcium 500mg niche?**
- Listings span $7.00–$34.76; the average listing price is $16.31 (sweet spot $15–$100). The average incumbent carries 886 reviews — the moat a new listing must climb.
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