---
title: "calcium carbonate 600 mg — Niche Verdict: Skip it (45/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/health-household/calcium-carbonate-600-mg"
last_updated: "2026-07-14T01:18:01.920Z"
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meta:
  description: "a small market ($39K/yr) — calcium carbonate 600 mg doesn't clear our bar today."
  "og:description": "a small market ($39K/yr) — calcium carbonate 600 mg doesn't clear our bar today."
  "og:title": "calcium carbonate 600 mg — Niche Verdict: Skip it (45/100) | Amazon United States - Flapen"
---

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# **calcium carbonate 600 mg**

**Skip it**

A small market ($39K/yr) — this niche doesn't clear our bar today.

Market size 10Growth 23Conversion 81Competition 47Returns 100Price range 59Avg price 58Brand share 51Review moat 24Quality gap 23

**Returns**

**Incredible****0.0%**

return rate — above 6% kills the launch gate

**Conversion**

**Great****8.6%**

search→purchase rate — share of searches ending in a sale

**Price range**

**Good****$6.55–$27.11**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Avg price**

**Good****$12.93**

avg listing price — sweet spot $15–$100

**Brand share**

**Good****74%**

top-5 brand share — brands hold most of the demand

**Competition**

**Okay****57%**

top-5 click share — leaders hold, buyers still browse

**Review moat**

**Bad****5,369.9**

avg incumbent reviews — the moat a new listing must climb

**Growth**

**Bad****-3.8%**

90-day search growth — must beat 0% to launch

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

**Market size**

**Bad****$39K**

$39K/yr · 36K searches

## **Competition**

The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**13 **▼falling

**Sellers**

**150**

**Top-5 brand share**

**74%**

**Open market**

**20%**

- BulkSupplements29% - MAJOR13% - Nature's Bounty11% - PURE ORIGINAL INGREDIENTS11% - Nature's Blend10% - RUGBY LABORATORIES5%

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$4K20%$8K30%$12K40%$16K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 20 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![BulkSupplements.com Calcium Carbonate Capsules - Calcium Carbonate Supplement Calcium Carbonate 500mg - Calcium Supplement Gluten Free 2 Capsules per Serving 360 Capsules (Pack of 1)](https://m.media-amazon.com/images/I/41jtRUQ+KxL.jpg)**BulkSupplements.com Calcium Carbonate Capsules - Calcium Carbonate Supplement Calcium Carbonate 500mg - Calcium Supplement Gluten Free 2 Capsules per Serving 360 Capsules (Pack of 1)**BulkSupplements**$17.68**4.6★396 rev](https://www.amazon.com/dp/B0BNSN9Y3G) [2![Pure Original Ingredients Calcium Carbonate (100 Capsules) Always Pure No Additives Or Fillers Lab Verified](https://m.media-amazon.com/images/I/31xZ2Mi8T6L.jpg)**Pure Original Ingredients Calcium Carbonate (100 Capsules) Always Pure No Additives Or Fillers Lab Verified**PURE ORIGINAL INGREDIENTS**$10.23**4.6★300 rev](https://www.amazon.com/dp/B07GSBW31Z) [3![Natures Blend Pure Calcium Carbonate 600 mg 100 Tabs (1684)](https://m.media-amazon.com/images/I/41ZiZsCiBCL.jpg)**Natures Blend Pure Calcium Carbonate 600 mg 100 Tabs (1684)**Nature's Blend**$9.40**4.6★1,083 rev](https://www.amazon.com/dp/B004KWNH04) [4![MAJOR Regular Strength Antacid Tablets - Calcium Carbonate 500 mg - Assorted Fruit Flavor - 150 Chewable Count (2 Pack)](https://m.media-amazon.com/images/I/41CRrLOgNRL.jpg)**MAJOR Regular Strength Antacid Tablets - Calcium Carbonate 500 mg - Assorted Fruit Flavor - 150 Chewable Count (2 Pack)**MAJOR**$10.01**4.6★881 rev](https://www.amazon.com/dp/B01M07E78O) [5![Natures Bounty Calcium Plus 400 IU Vitamin D3 Immune Support & Bone Health 300 Tablets](https://m.media-amazon.com/images/I/51VQ-2Z30QL.jpg)**Natures Bounty Calcium Plus 400 IU Vitamin D3 Immune Support & Bone Health 300 Tablets**Nature's Bounty**$15.89**4.7★7,158 rev](https://www.amazon.com/dp/B002FHL3DE)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Berkley Jensen Ultra Strength Antacid Chewable Tablets - 1000mg Calcium Carbonate for Heartburn Acid Indigestion Upset Stomach Relief - Assorted Berry Flavor - 265 Count](https://m.media-amazon.com/images/I/515PcSUE+oL.jpg)**Berkley Jensen Ultra Strength Antacid Chewable Tablets - 1000mg Calcium Carbonate for Heartburn Acid Indigestion Upset Stomach Relief - Assorted Berry Flavor - 265 Count**berkley jensen**$9.96**1,381 rev5mo ago](https://www.amazon.com/dp/B0GJN28LBP) [![BulkSupplements.com Calcium Carbonate Capsules - Calcium Carbonate Supplement Calcium Carbonate 500mg - Calcium Supplement Gluten Free 2 Capsules per Serving 360 Capsules (Pack of 1)](https://m.media-amazon.com/images/I/41jtRUQ+KxL.jpg)**BulkSupplements.com Calcium Carbonate Capsules - Calcium Carbonate Supplement Calcium Carbonate 500mg - Calcium Supplement Gluten Free 2 Capsules per Serving 360 Capsules (Pack of 1)**BulkSupplements**$17.68**396 rev3y ago](https://www.amazon.com/dp/B0BNSN9Y3G) [![Rugby Regular Strength Antacid Chewable Tablets - Made with 500 mg of Calcium Carbonate - Peppermint Flavor - 150 Count](https://m.media-amazon.com/images/I/31Mvh5kxm0L.jpg)**Rugby Regular Strength Antacid Chewable Tablets - Made with 500 mg of Calcium Carbonate - Peppermint Flavor - 150 Count**RUGBY LABORATORIES**$6.55**1,432 rev5y ago](https://www.amazon.com/dp/B089DVND23) [![Pure Original Ingredients Calcium Carbonate No Magnesium Or Rice Fillers Always Pure Lab Verified](https://m.media-amazon.com/images/I/41Fr6l8Du5L.jpg)**Pure Original Ingredients Calcium Carbonate No Magnesium Or Rice Fillers Always Pure Lab Verified**PURE ORIGINAL INGREDIENTS**$27.11**253 rev6y ago](https://www.amazon.com/dp/B085PVC91D) [![Pure Original Ingredients Calcium Carbonate (100 Capsules) Always Pure No Additives Or Fillers Lab Verified](https://m.media-amazon.com/images/I/31xZ2Mi8T6L.jpg)**Pure Original Ingredients Calcium Carbonate (100 Capsules) Always Pure No Additives Or Fillers Lab Verified**PURE ORIGINAL INGREDIENTS**$10.23**300 rev7y ago](https://www.amazon.com/dp/B07GSBW31Z)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![Natures Bounty Calcium 1200 mg with Vitamin D3 - Bone Health Softgels Calcium and Vitamin D Supplement 120 Ct (2-Pack)](https://m.media-amazon.com/images/I/41J6-93+SLL.jpg)**Natures Bounty Calcium 1200 mg with Vitamin D3 - Bone Health Softgels Calcium and Vitamin D Supplement 120 Ct (2-Pack)**Nature's Bounty**$15.32**4.6★**▲ 196%**](https://www.amazon.com/dp/B009IMJOO4) [![Berkley Jensen Ultra Strength Antacid Chewable Tablets - 1000mg Calcium Carbonate for Heartburn Acid Indigestion Upset Stomach Relief - Assorted Berry Flavor - 265 Count](https://m.media-amazon.com/images/I/515PcSUE+oL.jpg)**Berkley Jensen Ultra Strength Antacid Chewable Tablets - 1000mg Calcium Carbonate for Heartburn Acid Indigestion Upset Stomach Relief - Assorted Berry Flavor - 265 Count**berkley jensen**$9.96**4.7★**▲ 192%**](https://www.amazon.com/dp/B0GJN28LBP) [![Nature Made Calcium 600 mg with Vitamin D3 Dietary Supplement for Bone Support 220 Tablets](https://m.media-amazon.com/images/I/4103vYaBwKL.jpg)**Nature Made Calcium 600 mg with Vitamin D3 Dietary Supplement for Bone Support 220 Tablets**Nature Made**$13.68**4.7★**▲ 68%**](https://www.amazon.com/dp/B002FH5I0I) [![Natures Bounty Calcium Plus 400 IU Vitamin D3 Immune Support & Bone Health 300 Tablets](https://m.media-amazon.com/images/I/51VQ-2Z30QL.jpg)**Natures Bounty Calcium Plus 400 IU Vitamin D3 Immune Support & Bone Health 300 Tablets**Nature's Bounty**$15.89**4.7★**▲ 53%**](https://www.amazon.com/dp/B002FHL3DE) [![MAJOR Regular Strength Antacid Tablets - Calcium Carbonate 500 mg - Assorted Fruit Flavor - 150 Chewable Count (2 Pack)](https://m.media-amazon.com/images/I/41CRrLOgNRL.jpg)**MAJOR Regular Strength Antacid Tablets - Calcium Carbonate 500 mg - Assorted Fruit Flavor - 150 Chewable Count (2 Pack)**MAJOR**$10.01**4.6★**▲ 40%**](https://www.amazon.com/dp/B01M07E78O)

**~~View all trending →~~**

## **Demand**

Weekly Amazon search volume, last 48 weeks — -3.8% search growth over the last 90 days.

800600Black Friday '25Spike '26Aug '25Oct '25Nov '25Jan '26Mar '26May '26

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Value For Money**19%

*“Good deal”*

**Quality-Overall**15%

*“reliable”*

**Calcium**14%

*“Calcium works well”*

**Advertised Vs Actual Product**8%

*“As advertised”*

**Vitamin**6%

*“Great value and vitamins”*

**Taste-Overall**6%

*“The tablets taste good”*

**Ease Of Chewing/Swallowing**3%

*“Chewable anacid peppermint”*

**Efficiency**3%

*“But it does a good job”*

**Ease Of Use**3%

*“Ease of use”*

**Dosage**2%

*“the dosage is right”*

### **What buyers complain about **

**Size-Overall**18%

*“Smaller than expected”*

**Ease Of Chewing/Swallowing**10%

*“Too hard to chew”*

**Calcium**6%

*“bad product this is calcium”*

**Value For Money**4%

*“get a. more expensive”*

**Taste-Overall**4%

*“The tablets taste a little chalky”*

**Dosage**4%

*“at least not for the amount of D3 recommended by my doctor”*

**Hard Feel**2%

*“Hard As Rocks”*

**Quality-Overall**2%

*“Cheap”*

**Ease Of Use**2%

*“These are too hard sometimes to take”*

**Thickness**2%

*“Not as thick as others”*

### **Top return reasons **

**Calcium**38%

**Ease Of Chewing/Swallowing**19%

**Size-Overall**12%

**Advertised Vs Actual Product**8%

**Ingredients-Overall**4%

**Value For Money**4%

**Acid Regulator/Stomach Ache Relief**4%

**Dosage**4%

**Vitamin**4%

**Weight Heavy**4%