---
title: "Slow Release Iron — $2.8M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/slow-release-iron"
last_updated: "2026-08-11T06:50:36.701Z"
locale: en
meta:
description: "Niche score 48/100 · $2.8M/yr market · 738K searches/yr · $17.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $2.8M/yr market · 738K searches/yr · $17.14 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Slow Release Iron — $2.8M/yr Amazon US Niche (2026) - Flapen"
---
# **slow release iron**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 96Growth 15Conversion 100Competition 4Returns 100Price range 66Avg price 80Brand share 0Review moat 25Quality gap 19
**Conversion**
**Incredible****22.4%**
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****$2.8M**
$2.8M/yr · 738K searches
**Avg price**
**Great****$17.14**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$3.92–$36.07**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Bad****4,669.86**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-19.9%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****95%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, slow release iron is a $2.8M/yr Amazon United States market (738K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Mar. Verdict: Skip it — 48/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **slow release iron market data**
- **Units sold / yr**
- **125K–150K**
- avg 15,000–20,000/product
- **Revenue / yr**
- **$2.1M–$2.6M**
- units × avg price
- **Conversion rate**
- **22.4%**
- **Avg BSR**
- **#94**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **14%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **78 months**
- **Avg seller age**
- **152 days**
## **Competition & brand share**
The top 5 products capture 95% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**4 **▲rising
**Sellers**
**43**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**95%**
Top 20: 100%
**Open market**
**0%**
- Slow Fe76% - 21st Century18% - NUTRAHARMONY4% - Carlyle2%
## **Demand & seasonality**
Weekly Amazon search volume, last 101 weeks — -19.9% search growth over the last 90 days.
25K15KPrime Day '25Spike '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Mar · busiest ÷ quietest = 3.2×
[**Open Trend **](https://flapen.com/research/us/health-household/slow-release-iron/trend)
## **Top slow release iron search terms**
- **slow fe iron**172K/yr-1.3%19.8% conv. - **slow fe**217K/yr-42.7%18.4% conv. - **slow release iron**105K/yr-8.5%14.5% conv. - **slow fe iron supplement**35K/yr-29.8%17.0% conv. - **slow release iron supplement**30K/yr-5.5%12.1% conv. - **slow iron**16K/yr-3.2%11.5% conv. - **21st century vitamins**20K/yr-26.7%0.1% conv. - **iron slow release**16K/yr-8.9%13.3% conv. - **iron fe**12K/yr+14.1%7.2% conv. - **slow-fe iron**10K/yr+15.4%4.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/slow-release-iron/search-terms)
## **Top slow release iron 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%$426K30%$852K45%$1.3M60%$1.7M1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 7 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 60 Tablets**Slow Fe**$17.34**4.7★10,007 rev](https://www.amazon.com/dp/B00ZQUDWIG) [2**21st Century Slow Release Iron 45mg Tablets Gentle on Stomach 60 Count**21st Century**$3.92**4.6★14,995 rev](https://www.amazon.com/dp/B00582WT6I) [3**Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 30 Tablets**Slow Fe**$8.79**4.7★1,658 rev](https://www.amazon.com/dp/B0BGMPFJKQ) [4**Slow Fe Slow Release Iron Supplement 30 Tablets (Pack of 2)**Slow Fe**$26.34**4.7★2,129 rev](https://www.amazon.com/dp/B011A4NVG4) [5**Iron Supplement for Women - Iron 65mg (Ferrous Sulfate 325mg) - 60 Caps**NUTRAHARMONY**$17.76**4.6★2,124 rev](https://www.amazon.com/dp/B0D47FBQP6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Iron Supplement for Women - Iron 65mg (Ferrous Sulfate 325mg) - 60 Caps**NUTRAHARMONY**$17.76**2,124 rev2y ago](https://www.amazon.com/dp/B0D47FBQP6) [**Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 30 Tablets**Slow Fe**$8.79**1,658 rev3y ago](https://www.amazon.com/dp/B0BGMPFJKQ) [**Carlyle Iron Supplement for Women | 200 Slow Release Tablets | Vegetarian Non-GMO Gluten Free Pills | for Her**Carlyle**$9.77**1,145 rev4y ago](https://www.amazon.com/dp/B09BRTTGWF) [**Slow Fe High Potency Iron 45 mg Slow Release - 60 Tablets - Pack of 2**Slow Fe**$36.07**631 rev8y ago](https://www.amazon.com/dp/B077WZLBKH) [**Slow Fe Slow Release Iron Supplement 30 Tablets (Pack of 2)**Slow Fe**$26.34**2,129 rev11y ago](https://www.amazon.com/dp/B011A4NVG4)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 30 Tablets**Slow Fe**$8.79**4.7★**▲ 55%**](https://www.amazon.com/dp/B0BGMPFJKQ) [**Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 60 Tablets**Slow Fe**$17.34**4.7★**— 2%**](https://www.amazon.com/dp/B00ZQUDWIG) [**Iron Supplement for Women - Iron 65mg (Ferrous Sulfate 325mg) - 60 Caps**NUTRAHARMONY**$17.76**4.6★**— 1%**](https://www.amazon.com/dp/B0D47FBQP6) [**21st Century Slow Release Iron 45mg Tablets Gentle on Stomach 60 Count**21st Century**$3.92**4.6★**— 10%**](https://www.amazon.com/dp/B00582WT6I) [**Carlyle Iron Supplement for Women | 200 Slow Release Tablets | Vegetarian Non-GMO Gluten Free Pills | for Her**Carlyle**$9.77**4.7★**▼ 15%**](https://www.amazon.com/dp/B09BRTTGWF)
**~~View all trending →~~**
## **What buyers say about slow release iron**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Iron**23%
*“Good iron vitamin”*
**Quality-Overall**11%
*“Indeed, it is as good as the reviews claimed”*
**Acid Regulator/Stomach Ache Relief**9%
*“It caused me zero stomach upset and no constipation”*
**Value For Money**6%
*“Good value for price”*
**Advertised Vs Actual Product**6%
*“Works as advertised”*
**Efficiency**5%
*“Effective -”*
**Vitamin**4%
*“Great vitamine”*
**Ease Of Use**4%
*“Convenient to use”*
**Ease Of Chewing/Swallowing**3%
*“Easy on the tummy”*
**Side Effects**3%
*“It caused me zero stomach upset and no constipation”*
### **What buyers complain about **
**Iron**21%
*“Needed extra iron”*
**Ease Of Use**14%
*“impossible to get out easily”*
**Acid Regulator/Stomach Ache Relief**9%
*“Hurt my stomach horribly”*
**Side Effects**5%
*“I end up nauseated”*
**Value For Money**4%
*“Price increase to much”*
**Vitamin**4%
*“These are the worse vitamins that Ive EVER taken”*
**Taste-Overall**3%
*“No taste which is good to me”*
**Dosage**2%
*“It's a smaller dosage”*
**Pain Relief-Overall**2%
*“It was so painful and awful”*
**Smell**2%
*“Smells like rotten fish”*
### **Top return reasons **
**Iron**25%
**Vitamin**25%
**Functionality-Overall**25%
**Value For Money**25%
## **Common questions**
- **Is slow release iron profitable to sell on Amazon United States?**
- The niche generates $2.8M/yr across 7 tracked products. 90-day search growth is -19.9%. Flapen's verdict: Skip it (48/100).
- **How competitive is the slow release iron niche?**
- 4 brands and 43 sellers compete. The top 5 products take 95% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in slow release iron?**
- Top complaints mined from reviews: Iron, Ease Of Use, Acid Regulator/Stomach Ache Relief. The return rate is 0.0%.
- **When does demand for slow release iron peak?**
- Demand peaks in Mar; the busiest month runs 3.2× the quietest.
- **What does it cost to enter the slow release iron niche?**
- Listings span $3.92–$36.07; the average listing price is $17.14 (sweet spot $15–$100). The average incumbent carries 4,670 reviews — the moat a new listing must climb.
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