Is cod liver oil profitable to sell on Amazon United Kingdom?

The niche generates £1.6M/yr across 15 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -15.0%. Flapen's verdict: Worth a look (50/100).

How competitive is the cod liver oil niche?

12 brands and 68 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 78% of demand.

What do buyers complain about in cod liver oil?

Top complaints mined from reviews: Taste-Overall, Size-Overall, Smell. The return rate is 0.0%.

When does demand for cod liver oil peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the cod liver oil niche?

Listings span £4.61–£18.81; the average listing price is £9.22 (sweet spot $15–$100). The average incumbent carries 4,478 reviews — the moat a new listing must climb.

cod liver oil

Worth a look

Shows low returns (0.0%), but soft demand (-15.0% this quarter) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible17.6%

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

Market size

Great£1.6M

£1.6M/yr · 984K searches

Brand share

Okay78%

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

Avg price

Okay£9.22

avg listing price — sweet spot $15–$100

Price range

Okay£4.61–£18.81

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

Competition

Okay70%

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

Review moat

Bad4,477.67

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Growth

Bad-15.0%

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

According to Flapen's Amazon United Kingdom niche tracking, cod liver oil is a £1.6M/yr Amazon United Kingdom market (984K searches/yr). The top 5 brands hold 78% of demand. Verdict: Worth a look — 50/100.

Data updated Jul 24, 2026 · scored weekly · How we score niches

cod liver oil market data

Units sold / yr: 150K–200K; avg 8,000–10,000/product
Revenue / yr: £1.4M–£1.8M; units × avg price
Conversion rate: 17.6%
Avg BSR: #96
Page quality: 0%
Prime: 93%
Sponsored: 87%
Out of stock: 5.9%
Avg brand age: 81 months
Avg seller age: 166 days

Competition & brand share

The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.

Brands

12 falling

Sellers

Top-5 brand share

78%

Top 20: 100%

Top-5 click share

70%

Top 20: 100%

Open market

17%

Natures Aid42%
Sevenseas12%
Zipvit10%
NutriVolv9%
SEVEN SEAS5%
NEW LEAF PRODUCTS5%
Open — no brand owns it (6 brands, 17%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -15.0% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top cod liver oil search terms

cod liver oil capsules high strength365K/yr -6.5%18.0% conv.
cod liver oil309K/yr -19.7%11.3% conv.
cod liver oil capsules162K/yr -15.5%15.1% conv.
seven seas cod liver oil42K/yr -35.2%6.9% conv.
cod liver oil tablets21K/yr -33.1%10.7% conv.
codliver oil capsules 1000mg12K/yr -2.1%19.4% conv.
cod liver oil gelatine free8K/yr -5.9%0.8% conv.
cod liver oil capsules 1000mg14K/yr -55.3%16.2% conv.
seven seas cod liver oil capsules9K/yr -24.1%10.0% conv.
gelatine free cod liver oil5K/yr +2.6%0.5% conv.

All search terms

Top cod liver oil 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 15 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Natures Aid Cod Liver Oil 1000mg Softgels High Strength Omega-3 Fish Oil with Vitamins A & D Supports Immune System Heart Health Brain Vision Joints Non-GMO 180 Capsules

Natures Aid£7.474.7★6,484 rev

Seven Seas Cod Liver Oil One-A-Day Omega-3 Fish Oil and Vitamin D 120 Capsules 4 Months Supply

Sevenseas£7.414.7★7,936 rev

Natures Aid Cod Liver Oil 1000mg Softgels High Strength Omega-3 Fish Oil with Vitamins A & D Supports Immune System Heart Health Brain Vision Joints Non-GMO 90 Capsules

Natures Aid£5.464.7★2,973 rev

Cod Liver Oil High Strength 1000mg Heart Brain and Joint Healthcare Supplements Natural Rich Source of Omega 3 Fatty Acids | 120 Capsules

NutriVolv£6.104.7★1,228 rev

Cod Liver Oil 1000mg 360 Capsules of High Strength Fish Oil Rich in Omega 3. Supports Heart Health Brain Health Eye Health and Normal Blood Pressure

Zipvit£15.274.7★8,324 rev

Newest

by launch date

Pure Cod Liver Oil 1000mg | 360 Softgel Capsules | UK Made

Simply Supplements£14.814,202 rev

9mo ago

Pure Cod Liver Oil 1000mg | 180 Softgel Capsules | UK Made

Simply Supplements£8.23905 rev

9mo ago

Cod Liver Oil High Strength 1000mg Heart Brain and Joint Healthcare Supplements Natural Rich Source of Omega 3 Fatty Acids | 120 Capsules

NutriVolv£6.101,228 rev

5y ago

Cod Liver Oil Softgels 1000mg - 180 Cod Liver Soft gels High Strength Softgels- Cod Liver Oil Rich in Omega 3 EPA DHA Fatty Acids + Vitamins A & D High Strength Fish Oil - UK Made by New Leaf

NEW LEAF PRODUCTS£8.35793 rev

5y ago

Horbäach£18.811,730 rev

6y ago

What buyers say about cod liver oil

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

What buyers love

Value For Money26%

“Good Value”

Quality-Overall24%

“Definitely a solid quality product”

Advertised Vs Actual Product6%

“Arrived exactly as described”

Joint Pain5%

“Helping with joint pain”

Ease Of Chewing/Swallowing5%

“The capsules are easy enough to take and, importantly, I havent experienced the unpleasant fishy aftertaste or repeat burps that can sometimes come with fish oil supplements”

Ease Of Use4%

“Easy to take”

Taste-Overall3%

“No harsh taste, no struggle”

Vitamin3%

“arent difficult to swallow like most vitamins”

Size-Overall2%

“Size is good”

Nutritional Content2%

“Good supplement”

What buyers complain about

Taste-Overall14%

“The aftertaste is awful”

Size-Overall8%

“The capsules are a bit large”

Smell7%

“The container smells, as usual,”

Dosage6%

“this is NOT per capsule”

Oily/Greasy5%

“Cod liver oil”

Quality-Overall4%

“Bad quality tablets”

Ease Of Chewing/Swallowing4%

“Capsules are a bit large to swallow”

Value For Money4%

“But can get them cheaper in boots”

Advertised Vs Actual Product4%

“Misleading photo”