Is vitamin k profitable to sell on Amazon United Kingdom?

The niche generates £454K/yr across 17 tracked products. 90-day search growth is -29.7%. Flapen's verdict: Skip it (46/100).

How competitive is the vitamin k niche?

16 brands and 17 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 71% of demand.

What do buyers complain about in vitamin k?

Top complaints mined from reviews: Dosage, Size-Overall, Vitamin. The return rate is 0.1%.

When does demand for vitamin k peak?

Demand peaks in Aug–Sep; the busiest month runs 5.1× the quietest.

What does it cost to enter the vitamin k niche?

Listings span £1.93–£15.74; the average listing price is £9.23 (sweet spot $15–$100). The average incumbent carries 2,261 reviews — the moat a new listing must climb.

vitamin k

Skip it

Prices mostly outside the sweet spot ($1.93–$15.74) — this niche doesn't clear our bar today.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Conversion

Incredible12.1%

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

Market size

Good£454K

£454K/yr · 407K searches

Brand share

Good71%

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

Review moat

Okay2,261.12

avg incumbent reviews — the moat a new listing must climb

Competition

Okay69%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Avg price

Okay£9.23

avg listing price — sweet spot $15–$100

Growth

Bad-29.7%

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

Price range

Bad£1.93–£15.74

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

According to Flapen's Amazon United Kingdom niche tracking, vitamin k is a £454K/yr Amazon United Kingdom market (407K searches/yr). The top 5 brands hold 71% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 46/100.

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

vitamin k market data

Units sold / yr: 40K–50K; avg 1,500–2,000/product
Revenue / yr: £369K–£462K; units × avg price
Conversion rate: 12.1%
Avg BSR: #185
Page quality: 0%
Prime: 100%
Sponsored: 76%
Out of stock: 0.0%
Avg brand age: 50 months
Avg seller age: 173 days

Competition & brand share

The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.

Brands

16 falling

Sellers

Top-5 brand share

71%

Top 20: 100%

Top-5 click share

69%

Top 20: 100%

Open market

25%

WeightWorld25%
Nutrition Geeks17%
EVO NUTRITION14%
Carlyle9%
ALPHA016%
Horbäach5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -29.7% search growth over the last 90 days.

Peak months: Aug, Sep · busiest ÷ quietest = 5.1×

Open Trend

Top vitamin k search terms

vitamin k2139K/yr -32.1%10.3% conv.
k2 vitamin supplements63K/yr -35.1%12.1% conv.
vitamin k51K/yr -19.4%7.5% conv.
vitamin k2 mk731K/yr -37.1%11.1% conv.
k2 mk722K/yr -24.6%11.1% conv.
vitamin k2 high strength13K/yr -10.9%9.1% conv.
vit k211K/yr -19.7%10.1% conv.
k2 vitamin10K/yr -72.3%8.1% conv.
vit k4K/yr -11.3%8.3% conv.
vit k2 mk74K/yr -12.5%12.5% conv.

All search terms

Top vitamin k 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 17 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Vitamin K2 MK7 200mcg - 1 Year Supply - 365 Vegan Tablets - 1 a Day

WeightWorld£12.024.7★3,410 rev

Vitamin D3 4000 iu & Vitamin K2 MK7 100g - 1 Year Supply 365 Easy-Swallow Vitamin D3 K2 Tablets 1-A-Day High Strength Vegetarian D3 and K2 Vitamin Supplements UK Made Vitamin D Tablets

Nutrition Geeks£7.954.6★17,521 rev

EVO NUTRITION Vitamin K2 MK-7 200mcg | 365 Vegetarian and Vegan Tablets (not Capsules) | 1-A-Day | Supports Maintenance of Normal Bones | One Years Supply of High Strength Vitamin K2 Menaquinone MK7

EVO NUTRITION£11.504.6★3,226 rev

Carlyle£5.864.6★514 rev

Vitamin K2 MK7 200ug | 365 High Strength Tablets | Menaquinone MK-7 | Suitable for Vegetarians and Vegans | by Horbaach

Horbäach£8.264.5★1,135 rev

Newest

by launch date

PURE NUTRITION NATURAL TREASURES£10.3131 rev

1y ago

Vitamin D3 4000 iu & Vitamin K2 MK7 100g - 1 Year Supply 365 Easy-Swallow Vitamin D3 K2 Tablets 1-A-Day High Strength Vegetarian D3 and K2 Vitamin Supplements UK Made Vitamin D Tablets

Nutrition Geeks£7.9517,521 rev

2y ago

Carlyle£5.86514 rev

2y ago

Bulk Vitamin K2 Tablets 75ug 90 Tablets

Bulk£1.93114 rev

3y ago

Vitamin K2 MK7 200mcg - 1 Year Supply - 365 Vegan Tablets - 1 a Day

WeightWorld£12.023,410 rev

4y ago

What buyers say about vitamin k

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

What buyers love

Quality-Overall19%

“Good quality and easy to swallow”

Value For Money17%

“Good price”

Vitamin16%

“Healthy vitamin”

Ease Of Chewing/Swallowing11%

“Easy to swallow”

Advertised Vs Actual Product5%

“As advertised”

Ease Of Use4%

“Easy to use”

Side Effects3%

“dont leave any aftertaste”

Dosage2%

“Just the right dosage”

Efficiency2%

“effective”

Calcium1%

“I use them alongside my calcium/vitD to encourage the calcium to go directly to my bones”

What buyers complain about

Dosage13%

“it looks as if the dosage is very high”

Size-Overall9%

“First of all the cap doesnt fit the bottle”

Vitamin9%

“Not the right type of Vitamin D for me I guess”

Functionality-Overall5%

“Not working”

Advertised Vs Actual Product5%

“Other brands are misleading”

Value For Money5%

“Cheap for a reason”

Nutritional Content4%

“Other products in the Nutrition Geeks line are a scam”

Side Effects4%

“they made me ill”

Quality-Overall3%

“Not for me seem cheap n cheerful”

Strength3%

“Either too strong or poorly formulated”

Top return reasons

Vitamin100%

Common questions

Is vitamin k profitable to sell on Amazon United Kingdom?: The niche generates £454K/yr across 17 tracked products. 90-day search growth is -29.7%. Flapen's verdict: Skip it (46/100).
How competitive is the vitamin k niche?: 16 brands and 17 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 71% of demand.
What do buyers complain about in vitamin k?: Top complaints mined from reviews: Dosage, Size-Overall, Vitamin. The return rate is 0.1%.
When does demand for vitamin k peak?: Demand peaks in Aug–Sep; the busiest month runs 5.1× the quietest.
What does it cost to enter the vitamin k niche?: Listings span £1.93–£15.74; the average listing price is £9.23 (sweet spot $15–$100). The average incumbent carries 2,261 reviews — the moat a new listing must climb.