Is riboflavin 400mg profitable to sell on Amazon United Kingdom?

The niche generates £76K/yr across 8 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -14.9%. Flapen's verdict: Skip it (40/100).

How competitive is the riboflavin 400mg niche?

8 brands and 17 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 90% of demand.

What do buyers complain about in riboflavin 400mg?

Top complaints mined from reviews: Side Effects, Color, Size-Overall. The return rate is 0.0%.

When does demand for riboflavin 400mg peak?

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

What does it cost to enter the riboflavin 400mg niche?

Listings span £4.63–£15.81; the average listing price is £10.66 (sweet spot $15–$100). The average incumbent carries 2,267 reviews — the moat a new listing must climb.

riboflavin 400mg

Skip it

Prices mostly outside the sweet spot ($4.63–$15.81) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible15.9%

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

Quality gap

Good4.4★

avg incumbent rating — lower means beatable quality

Review moat

Okay2,266.75

avg incumbent reviews — the moat a new listing must climb

Avg price

Okay£10.66

avg listing price — sweet spot $15–$100

Brand share

Bad90%

top-5 brand share — brand-locked demand

Market size

Bad£76K

£76K/yr · 45K searches

Growth

Bad-14.9%

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

Competition

Bad90%

top-5 click share — a locked-up shelf

Price range

Bad£4.63–£15.81

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

According to Flapen's Amazon United Kingdom niche tracking, riboflavin 400mg is a £76K/yr Amazon United Kingdom market (45K searches/yr). The top 5 brands hold 90% of demand. Verdict: Skip it — 40/100.

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

riboflavin 400mg market data

Units sold / yr: 6K–8K; avg 500–750/product
Revenue / yr: £64K–£85K; units × avg price
Conversion rate: 15.9%
Avg BSR: #6
Page quality: 0%
Prime: 100%
Sponsored: 75%
Out of stock: 1.7%
Avg brand age: 71 months
Avg seller age: 195 days

Competition & brand share

The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.

Brands

8 rising

Sellers

Top-5 brand share

90%

Top 20: 100%

Top-5 click share

90%

Top 20: 100%

Open market

Health4All40%
MetaSuperfoods20%
Nutricost18%
Bespoke Biotics7%
Horbäach5%
ARC) HEALTH+NUTRITION WWW.ARCHEALTHNUTRITION.CO.UK4%
Open — no brand owns it (2 brands, 6%)

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — -14.9% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top riboflavin 400mg search terms

riboflavin 400mg24K/yr -18.2%14.6% conv.
vitamin b2 riboflavin 400mg12K/yr -10.0%13.9% conv.
riboflavin 400mg migraine6K/yr -24.0%13.4% conv.
vitamin b2 400mg4K/yr +13.3%14.3% conv.

All search terms

Top riboflavin 400mg 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 8 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Vitamin B2 Riboflavin 400mg Migraine Support 120 Capsules 4 Months Supply

Health4All£13.374.6★801 rev

MetaSuperfoods£11.004.3★75 rev

Nutricost Vitamin B2 (Riboflavin) 400mg 120 Capsules - Gluten Free Non-GMO Energy Boost Premium Quality

Nutricost£13.194.6★14,807 rev

MigraSoothe Original Vitamin B2 Riboflavin 400mg Capsules for Adults - High Strength Daily Supplement for Migraine Wellness Routine and Energy Metabolism - Vegan Made in UK 30 Capsules

Bespoke Biotics£10.874.3★113 rev

Vitamin B2 Riboflavin 200mg | 120 Vegan Tablets (4 Months Supply) | High Strength Supplement | No Artificial Preservatives | by Horbaach

Horbäach£8.474.6★50 rev

Newest

by launch date

Vitamin B2 Riboflavin Supplement 60 Vegan Tablets for Men & Women High Strength Made in the UK

ARC) HEALTH+NUTRITION WWW.ARCHEALTHNUTRITION.CO.UK£4.634 rev

8mo ago

MetaSuperfoods£11.0075 rev

1y ago

Vitamin B2 Riboflavin 200mg | 120 Vegan Tablets (4 Months Supply) | High Strength Supplement | No Artificial Preservatives | by Horbaach

Horbäach£8.4750 rev

1y ago

Vitamin B2 Riboflavin 400mg Migraine Support 120 Capsules 4 Months Supply

Health4All£13.37801 rev

3y ago

MigraSoothe Original Vitamin B2 Riboflavin 400mg Capsules for Adults - High Strength Daily Supplement for Migraine Wellness Routine and Energy Metabolism - Vegan Made in UK 30 Capsules

Bespoke Biotics£10.87113 rev

4y ago

What buyers say about riboflavin 400mg

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

What buyers love

Value For Money25%

“Good value for money”

Ease Of Chewing/Swallowing16%

“Easy to swallow”

Quality-Overall13%

“Good quality”

Advertised Vs Actual Product8%

“As described”

Energy Level6%

“Really good I have noticed a difference in my energy levels”

Natural Ingredients6%

“Natural ingredients”

Vitamin5%

“A potent addition to my daily supplement stack”

Taste-Overall3%

“no unpleasant taste”

Locally Manufactured3%

“Made in the Uk”

Inflammation2%

“.Whilst fighting inflammation”

What buyers complain about

Side Effects12%

“Unfortunately these had the opposite effect on me”

Color10%

“Warning your pee will be luminous yellow”

Size-Overall9%

“Very small box”

Smell8%

“Watch out packing product causes very smelly trumps”

Stress/Anxiety7%

“Caused me anxiety for some reason”

Functionality-Overall7%

“Doesn't work”

Vitamin7%

“Your body is filtering out unused vitamins”

Dosage6%

“Its near impossible in the UK to find this dose of B12 in one capsule. most places only do 100mg capsules at most”

Quality-Overall3%

“Rubbish”

Acid Regulator/Stomach Ache Relief3%

“Caused mega stomach aches”

Top return reasons

Vitamin100%

Common questions

Is riboflavin 400mg profitable to sell on Amazon United Kingdom?: The niche generates £76K/yr across 8 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -14.9%. Flapen's verdict: Skip it (40/100).
How competitive is the riboflavin 400mg niche?: 8 brands and 17 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 90% of demand.
What do buyers complain about in riboflavin 400mg?: Top complaints mined from reviews: Side Effects, Color, Size-Overall. The return rate is 0.0%.
When does demand for riboflavin 400mg peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the riboflavin 400mg niche?: Listings span £4.63–£15.81; the average listing price is £10.66 (sweet spot $15–$100). The average incumbent carries 2,267 reviews — the moat a new listing must climb.