Is fish oil liquid profitable to sell on Amazon United Kingdom?

The niche generates £81K/yr across 24 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -26.4%. Flapen's verdict: Skip it (46/100).

How competitive is the fish oil liquid niche?

10 brands and 94 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 88% of demand.

What do buyers complain about in fish oil liquid?

Top complaints mined from reviews: Taste-Overall, Smell, Value For Money. The return rate is 0.1%.

When does demand for fish oil liquid peak?

Demand peaks in Aug–Sep–Oct; the busiest month runs 2.2× the quietest.

What does it cost to enter the fish oil liquid niche?

Listings span £8.80–£47.98; the average listing price is £21.27 (sweet spot $15–$100). The average incumbent carries 1,947 reviews — the moat a new listing must climb.

fish oil liquid

Skip it

Soft demand (-26.4% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Avg price

Great£21.27

avg listing price — sweet spot $15–$100

Price range

Great£8.80–£47.98

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

Conversion

Great7.5%

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

Competition

Okay56%

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

Review moat

Okay1,946.88

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay88%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad£81K

£81K/yr · 51K searches

Growth

Bad-26.4%

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

According to Flapen's Amazon United Kingdom niche tracking, fish oil liquid is a £81K/yr Amazon United Kingdom market (51K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Aug–Sep–Oct. Verdict: Skip it — 46/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

fish oil liquid market data

Units sold / yr: 3K–4K; avg 100–250/product
Revenue / yr: £64K–£85K; units × avg price
Conversion rate: 7.5%
Avg BSR: #68
Page quality: 0%
Prime: 92%
Sponsored: 92%
Out of stock: 1.1%
Avg brand age: 75 months
Avg seller age: 171 days

Competition & brand share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

10 falling

Sellers

Top-5 brand share

88%

Top 20: 100%

Top-5 click share

56%

Top 20: 96%

Open market

MÖLLER'S51%
Inner Vitality17%
Natures Aid11%
Nordic Supplements5%
Sevenseas5%
Wiley's Finest5%
Open — no brand owns it (4 brands, 7%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -26.4% search growth over the last 90 days.

Peak months: Aug, Sep, Oct · busiest ÷ quietest = 2.2×

Open Trend

Top fish oil liquid search terms

mollers omega 314K/yr -28.0%8.0% conv.
omega 3 liquid8K/yr -21.0%5.3% conv.
fish oil liquid8K/yr -26.5%5.6% conv.
omega 3 fish oil liquid7K/yr -24.8%6.4% conv.
liquid fish oil5K/yr -16.5%3.8% conv.
mollers6K/yr -36.8%7.2% conv.
mollers cod liver oil3K/yr -34.0%9.1% conv.

All search terms

Top fish oil liquid 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Omega 3 Fish Oil Liquid - Natural Fresh Lemon Flavour with NO Fishy Taste High Strength DHA/EPA - 200ml Made from Wild Caught Nordic Fish Oil | 3rd Party Tested for Purity - Inner Vitality

Inner Vitality£15.834.7★464 rev

MÖLLER'S£15.184.7★3,280 rev

Natures Aid Cod Liver Oil Liquid 500ml - High Strength Omega-3 Fish Oil with Vitamins A & D - Supports Immune System Heart Health Brain Function and Vision - Non-GMO - Purity Guaranteed

Natures Aid£9.364.5★1,009 rev

MÖLLER'S£24.974.7★3,280 rev

Mollers | Cod Liver Oil Capsules | Omega 3 Fatty Acids DHA & EPA Contains Vitamin A D & E Supports Immune System Heart Function Brain Function & Vision | 160 Units

MÖLLER'S£13.424.5★4,564 rev

Newest

by launch date

Mollers | Cod Liver Oil Capsules | Omega 3 Fatty Acids DHA & EPA Contains Vitamin A D & E Supports Immune System Heart Function Brain Function & Vision | 160 Units

MÖLLER'S£13.424,564 rev

9mo ago

Seven Seas Omega-3 Fish Oil Plus Cod Liver Oil MAX Strength with Omega-3 Vitamins D and Vitamin E. Food Supplement for Brain2 & Body1-4 Support 450ml Liquid

Sevenseas£13.7465 rev

9mo ago

MÖLLER'S£32.303,280 rev

1y ago

Nordic Supplements High Strength 200ml Omega 3 Fish Oil. Taste Award Winning Lemon Flavoured and Tested.

Nordic Supplements£15.3831 rev

1y ago

Mollers | Omega 3 Jellies for Children | Strawberry | 72 Capsules

MÖLLER'S£19.403,788 rev

2y ago

What buyers say about fish oil liquid

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

What buyers love

Quality-Overall27%

“Excellent Product”

Taste-Overall21%

“Tastes just like any other brand”

Value For Money9%

“reasonable price”

Ease Of Use5%

“is good to use”

Flavor5%

“My kids are very happy with the flavour”

Nutritional Content3%

“this type of fish oil is literally the best supplement money can buy for your health”

Vitamin2%

“Good supplement”

Smell2%

“just a pleasant lemon zesty aroma”

Ease Of Chewing/Swallowing2%

“easy for my child to eat”

Joint Pain1%

“This has helped my hip joint”

What buyers complain about

Taste-Overall22%

“Tasted very artificial to me”

Smell11%

“The smell is disgusting”

Value For Money8%

“They are expensive”

Oily/Greasy6%

“barely oily”

Advertised Vs Actual Product4%

“False description - FISHY smell and taste”

Quality-Overall3%

“Disappointing quality”

Flavor2%

“then you get a bubble gum flavour after taste”

Ingredients-Overall2%

“they would not take accountability for the ingredients or even send it back”

Heart Health2%

“i am afraid it gave me dreadful heartburn so i stopped”

Functionality-Overall2%

“Its not very effective”

Common questions

Is fish oil liquid profitable to sell on Amazon United Kingdom?: The niche generates £81K/yr across 24 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -26.4%. Flapen's verdict: Skip it (46/100).
How competitive is the fish oil liquid niche?: 10 brands and 94 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 88% of demand.
What do buyers complain about in fish oil liquid?: Top complaints mined from reviews: Taste-Overall, Smell, Value For Money. The return rate is 0.1%.
When does demand for fish oil liquid peak?: Demand peaks in Aug–Sep–Oct; the busiest month runs 2.2× the quietest.
What does it cost to enter the fish oil liquid niche?: Listings span £8.80–£47.98; the average listing price is £21.27 (sweet spot $15–$100). The average incumbent carries 1,947 reviews — the moat a new listing must climb.