Is castor oil soap profitable to sell on Amazon United States?

The niche generates $58K/yr across 13 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +47.4%. Flapen's verdict: Worth a look (50/100).

How competitive is the castor oil soap niche?

4 brands and 10 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in castor oil soap?

Top complaints mined from reviews: Moist/Dry, Smell, Hair Related. The return rate is 0.6%.

When does demand for castor oil soap peak?

Demand peaks in Jan–Aug–Sep; the busiest month runs 20.5× the quietest.

What does it cost to enter the castor oil soap niche?

Listings span $10.10–$27.19; the average listing price is $16.37 (sweet spot $15–$100). The average incumbent carries 12,211 reviews — the moat a new listing must climb.

castor oil soap

Worth a look

Shows searches that convert (14.6% search→purchase), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Conversion

Incredible14.6%

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

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Avg price

Great$16.37

avg listing price — sweet spot $15–$100

Price range

Good$10.10–$27.19

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

Growth

Good+47.4%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Competition

Okay68%

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

Review moat

Bad12,211.46

avg incumbent reviews — the moat a new listing must climb

Market size

Bad$58K

$58K/yr · 24K searches

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, castor oil soap is a $58K/yr Amazon United States market (24K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jan–Aug–Sep. Verdict: Worth a look — 50/100.

Data updated Jul 14, 2026 · scored weekly · How we score niches

castor oil soap market data

Units sold / yr: 3K–4K; avg 250–500/product
Revenue / yr: $49K–$65K; units × avg price
Conversion rate: 14.6%
Avg BSR: #515
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 2.8%
Avg brand age: 42 months
Avg seller age: 141 days

Competition & brand share

The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.

Brands

4 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

68%

Top 20: 100%

Open market

Kitsch86%
MARS MADE6%
Hair Thickness Maximizer6%
PureRootss3%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +47.4% search growth over the last 90 days.

Peak months: Jan, Aug, Sep · busiest ÷ quietest = 20.5×

Open Trend

Top castor oil soap search terms

kitsch castor oil shampoo bar8K/yr +215.0%10.6% conv.
castor oil shampoo bar11K/yr -9.7%7.2% conv.
kitsch castor oil shampoo and conditioner bar4K/yr +32.6%15.0% conv.
castor oil bar shampoo2K/yr -3.4%9.0% conv.
castor oil shampoo bar for hair growth472/yr -59.6%11.1% conv.

All search terms

Top castor oil soap 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 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Kitsch Castor Oil Shampoo Bar Soap - Hydrating & Moisturizing Hair Care - Organic Castor Oil Solid Shampoo for Hair Growth & Scalp Nourishment - Silicone & Paraben-Free Vegan - 3.2oz

Kitsch$12.604.5★14,725 rev

Kitsch Castor Oil Shampoo and Conditioner Set - Organic Castor Oil Hair Care for Dull & Dry Hair - Nourishing Bar Soap for Hair Growth - Free of Sulfate Silicone & Paraben - 2pcs

Kitsch$24.464.3★35,973 rev

Kitsch Smoothing Castor Oil Liquid Shampoo Nourishing Hair Shampoo for Women & Men Smooths Dry Damaged & Frizzy Hair Clean Bio-Based Color-Safe Hair Care Made in USA 12.3 oz

Kitsch$12.554.4★1,955 rev

Kitsch Castor Oil Conditioner Bar Soap - Hydrating & Moisturizing Hair Care - Organic Castor Oil Conditioner for Hair Growth & Scalp Nourishment - Silicone & Paraben-Free Vegan Made in USA - 2.7oz

Kitsch$12.314.5★764 rev

Kitsch Smoothing Castor Oil Liquid Conditioner for Women and Men Nourishing Hair Conditioner for Dry Damaged & Frizzy Hair Clean Color-Safe Hair Care Bio-Based Formula Made in USA 12.3 oz

Kitsch$12.334.4★141 rev

Newest

by launch date

Kitsch Castor Oil Shampoo and Conditioner Set Nourishing Hair Care

Kitsch$27.1915 rev

2mo ago

Kitsch Rosemary & Biotin Shampoo Bar - For Hair Growth Strengthening Thickening & Volumizing Shampoo for Women and Men - Free of Parabens Sulfates & Silicones - Made in USA 3.5 oz

Kitsch$12.6914,725 rev

4mo ago

Kitsch Smoothing Castor Oil Liquid Shampoo Nourishing Hair Shampoo for Women & Men Smooths Dry Damaged & Frizzy Hair Clean Bio-Based Color-Safe Hair Care Made in USA 12.3 oz

Kitsch$12.551,955 rev

9mo ago

Kitsch Smoothing Castor Oil Liquid Conditioner for Women and Men Nourishing Hair Conditioner for Dry Damaged & Frizzy Hair Clean Color-Safe Hair Care Bio-Based Formula Made in USA 12.3 oz

Kitsch$12.33141 rev

9mo ago

Kitsch Argan Oil Shampoo Bar for Hair Growth Repairing Hair Shampoo for Women & Men Strengthening & Moisturizing Hair Care Paraben Phthalates Silicone & Sulfate Free - Made in USA 3.2 oz

Kitsch$12.2214,725 rev

1y ago

What buyers say about castor oil soap

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

What buyers love

Smell20%

“Excelente aroma”

Lather13%

“Good lather”

Soft Feel12%

“Leaves hair soft”

Quality-Overall8%

“Excellent line of products”

Hair Growth7%

“It has made a huge difference my hair routine”

Cleansing6%

“rinses cleanly”

Ease Of Use3%

“Easy to use”

Hair Styling3%

“Honestly my hair feels so good”

Moist/Dry3%

“Very moisturizing”

Suitability Straight Hair3%

“Nice hair treat”

What buyers complain about

Moist/Dry10%

“a little dry”

Smell9%

“Scent is too strong”

Hair Related7%

“Didnt work out for my hair”

Lather7%

“becomes even harder to lather”

Durability6%

“break in pieces”

Oily/Greasy4%

“it makes my hair so greasy”

Ease Of Use4%

“hard to use”

Value For Money3%

“Pricey”

Suitability Short Hair3%

“And you can't really use it very well because it gets snagged in your hair”

Ingredients-Overall2%

“Changed ingredients -not good anymore”

Top return reasons

Smell26%

Advertised Vs Actual Product11%

Suitability Short Hair9%

Moist/Dry7%

Oily/Greasy5%

Defective Material/Parts4%

Functionality-Overall4%

Size-Overall4%

Value For Money4%

Lather3%

Common questions

Is castor oil soap profitable to sell on Amazon United States?: The niche generates $58K/yr across 13 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +47.4%. Flapen's verdict: Worth a look (50/100).
How competitive is the castor oil soap niche?: 4 brands and 10 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in castor oil soap?: Top complaints mined from reviews: Moist/Dry, Smell, Hair Related. The return rate is 0.6%.
When does demand for castor oil soap peak?: Demand peaks in Jan–Aug–Sep; the busiest month runs 20.5× the quietest.
What does it cost to enter the castor oil soap niche?: Listings span $10.10–$27.19; the average listing price is $16.37 (sweet spot $15–$100). The average incumbent carries 12,211 reviews — the moat a new listing must climb.