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.

slow release iron

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible22.4%

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

Returns

Incredible0.0%

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

Bad4,669.86

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Growth

Bad-19.9%

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

Competition

Bad95%

top-5 click share — a locked-up shelf

Brand share

Bad100%

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

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

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

95%

Top 20: 100%

Open market

Slow Fe76%
21st Century18%
NUTRAHARMONY4%
Carlyle2%

Demand & seasonality

Weekly Amazon search volume, last 101 weeks — -19.9% search growth over the last 90 days.

Peak months: Mar · busiest ÷ quietest = 3.2×

Open Trend

Top slow release iron search terms

slow fe iron172K/yr -1.3%19.8% conv.
slow fe217K/yr -42.7%18.4% conv.
slow release iron105K/yr -8.5%14.5% conv.
slow fe iron supplement35K/yr -29.8%17.0% conv.
slow release iron supplement30K/yr -5.5%12.1% conv.
slow iron16K/yr -3.2%11.5% conv.
21st century vitamins20K/yr -26.7%0.1% conv.
iron slow release16K/yr -8.9%13.3% conv.
iron fe12K/yr +14.1%7.2% conv.
slow-fe iron10K/yr +15.4%4.3% conv.

All 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.

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

Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 60 Tablets

Slow Fe$17.344.7★10,007 rev

21st Century Slow Release Iron 45mg Tablets Gentle on Stomach 60 Count

21st Century$3.924.6★14,995 rev

Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 30 Tablets

Slow Fe$8.794.7★1,658 rev

Slow Fe Slow Release Iron Supplement 30 Tablets (Pack of 2)

Slow Fe$26.344.7★2,129 rev

Iron Supplement for Women - Iron 65mg (Ferrous Sulfate 325mg) - 60 Caps

NUTRAHARMONY$17.764.6★2,124 rev

Newest

by launch date

Iron Supplement for Women - Iron 65mg (Ferrous Sulfate 325mg) - 60 Caps

NUTRAHARMONY$17.762,124 rev

2y ago

Slow Fe 45mg Iron Supplement for Iron Deficiency Slow Release 30 Tablets

Slow Fe$8.791,658 rev

3y ago

Carlyle Iron Supplement for Women | 200 Slow Release Tablets | Vegetarian Non-GMO Gluten Free Pills | for Her

Carlyle$9.771,145 rev

4y ago

Slow Fe High Potency Iron 45 mg Slow Release - 60 Tablets - Pack of 2

Slow Fe$36.07631 rev

8y ago

Slow Fe Slow Release Iron Supplement 30 Tablets (Pack of 2)

Slow Fe$26.342,129 rev

11y ago

What buyers say about slow release iron

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

What buyers love

Iron23%

“Good iron vitamin”

Quality-Overall11%

“Indeed, it is as good as the reviews claimed”

Acid Regulator/Stomach Ache Relief9%

“It caused me zero stomach upset and no constipation”

Value For Money6%

“Good value for price”

Advertised Vs Actual Product6%

“Works as advertised”

Efficiency5%

“Effective -”

Vitamin4%

“Great vitamine”

Ease Of Use4%

“Convenient to use”

Ease Of Chewing/Swallowing3%

“Easy on the tummy”

Side Effects3%

“It caused me zero stomach upset and no constipation”

What buyers complain about

Iron21%

“Needed extra iron”

Ease Of Use14%

“impossible to get out easily”

Acid Regulator/Stomach Ache Relief9%

“Hurt my stomach horribly”

Side Effects5%

“I end up nauseated”

Value For Money4%

“Price increase to much”

Vitamin4%

“These are the worse vitamins that Ive EVER taken”

Taste-Overall3%

“No taste which is good to me”

Dosage2%

“It's a smaller dosage”

Pain Relief-Overall2%

“It was so painful and awful”

Smell2%

“Smells like rotten fish”

Top return reasons

Iron25%

Vitamin25%

Functionality-Overall25%

Value For Money25%

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.