---
title: "Riboflavin 400mg — £76K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/riboflavin-400mg"
last_updated: "2026-07-31T11:40:58.150Z"
locale: en
meta:
description: "Niche score 40/100 · £76K/yr market · 45K searches/yr · £10.66 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 40/100 · £76K/yr market · 45K searches/yr · £10.66 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Riboflavin 400mg — £76K/yr Amazon UK Niche (2026) - Flapen"
---
# **riboflavin 400mg**
**Skip it**
Prices mostly outside the sweet spot ($4.63–$15.81) — this niche doesn't clear our bar today.
Market size 19Growth 18Conversion 97Competition 8Returns 100Price range 7Avg price 39Brand share 25Review moat 42Quality gap 65
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.9%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Good****4.4★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Okay****2,266.75**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Okay****£10.66**
avg listing price — sweet spot $15–$100
**Brand share**
**Bad****90%**
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**
**Bad****90%**
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 ~~](https://flapen.com/research/methodology)
## **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**
**17**
**Top-5 brand share**
**90%**
Top 20: 100%
**Top-5 click share**
**90%**
Top 20: 100%
**Open market**
**6%**
- 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.
1K600Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/riboflavin-400mg/trend)
## **Top riboflavin 400mg search terms**
- **riboflavin 400mg**24K/yr-18.2%14.6% conv. - **vitamin b2 riboflavin 400mg**12K/yr-10.0%13.9% conv. - **riboflavin 400mg migraine**6K/yr-24.0%13.4% conv. - **vitamin b2 400mg**4K/yr+13.3%14.3% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/riboflavin-400mg/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.
0%15%£11K30%£23K45%£34K60%£46K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**Vitamin B2 Riboflavin 400mg Migraine Support 120 Capsules 4 Months Supply**Health4All**£13.37**4.6★801 rev](https://www.amazon.co.uk/dp/B0BSGXX59V) [2**Vitamin B2 Riboflavin | 400mg Migraine Support 180 Capsules | 6 Months Supply | Vegan High Strength Riboflavin Supplement | Liposomal Delivery for Maximum Absorption | Non-GMO | UK Company**MetaSuperfoods**£11.00**4.3★75 rev](https://www.amazon.co.uk/dp/B0F7T9LSCB) [3**Nutricost Vitamin B2 (Riboflavin) 400mg 120 Capsules - Gluten Free Non-GMO Energy Boost Premium Quality**Nutricost**£13.19**4.6★14,807 rev](https://www.amazon.co.uk/dp/B01IG5JH90) [4**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**£10.87**4.3★113 rev](https://www.amazon.co.uk/dp/B09YH33DYV) [5**Vitamin B2 Riboflavin 200mg | 120 Vegan Tablets (4 Months Supply) | High Strength Supplement | No Artificial Preservatives | by Horbaach**Horbäach**£8.47**4.6★50 rev](https://www.amazon.co.uk/dp/B0DXVNJQN6)
**~~View all top sellers →~~**
### **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**£4.63**4 rev8mo ago](https://www.amazon.co.uk/dp/B0G39ZHC3T) [**Vitamin B2 Riboflavin | 400mg Migraine Support 180 Capsules | 6 Months Supply | Vegan High Strength Riboflavin Supplement | Liposomal Delivery for Maximum Absorption | Non-GMO | UK Company**MetaSuperfoods**£11.00**75 rev1y ago](https://www.amazon.co.uk/dp/B0F7T9LSCB) [**Vitamin B2 Riboflavin 200mg | 120 Vegan Tablets (4 Months Supply) | High Strength Supplement | No Artificial Preservatives | by Horbaach**Horbäach**£8.47**50 rev1y ago](https://www.amazon.co.uk/dp/B0DXVNJQN6) [**Vitamin B2 Riboflavin 400mg Migraine Support 120 Capsules 4 Months Supply**Health4All**£13.37**801 rev3y ago](https://www.amazon.co.uk/dp/B0BSGXX59V) [**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**£10.87**113 rev4y ago](https://www.amazon.co.uk/dp/B09YH33DYV)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Vitamin B2 Riboflavin Supplement 60 Vegan Tablets for Men & Women High Strength Made in the UK**ARC) HEALTH+NUTRITION WWW.ARCHEALTHNUTRITION.CO.UK**£4.63**3.4★**▲ 90%**](https://www.amazon.co.uk/dp/B0G39ZHC3T) [**Vitamin B2 Riboflavin | 400mg Migraine Support 180 Capsules | 6 Months Supply | Vegan High Strength Riboflavin Supplement | Liposomal Delivery for Maximum Absorption | Non-GMO | UK Company**MetaSuperfoods**£11.00**4.3★**▲ 44%**](https://www.amazon.co.uk/dp/B0F7T9LSCB) [**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**£10.87**4.3★**▲ 33%**](https://www.amazon.co.uk/dp/B09YH33DYV) [**Solgar Vitamin B2 (Riboflavin) 100 mg Vegetable Capsules - Pack of 100 - Supports Energy Production - Can Help Reduce Tiredness and Fatigue - Vegan and Gluten-Free**Solgar**£7.95**4.6★**▲ 31%**](https://www.amazon.co.uk/dp/B00020IAJG) [**Vitamin B2 Riboflavin 200mg | 120 Vegan Tablets (4 Months Supply) | High Strength Supplement | No Artificial Preservatives | by Horbaach**Horbäach**£8.47**4.6★**— 5%**](https://www.amazon.co.uk/dp/B0DXVNJQN6)
**~~View all trending →~~**
## **What buyers say about riboflavin 400mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Value For Money**25%
*“Good value for money”*
**Ease Of Chewing/Swallowing**16%
*“Easy to swallow”*
**Quality-Overall**13%
*“Good quality”*
**Advertised Vs Actual Product**8%
*“As described”*
**Energy Level**6%
*“Really good I have noticed a difference in my energy levels”*
**Natural Ingredients**6%
*“Natural ingredients”*
**Vitamin**5%
*“A potent addition to my daily supplement stack”*
**Taste-Overall**3%
*“no unpleasant taste”*
**Locally Manufactured**3%
*“Made in the Uk”*
**Inflammation**2%
*“.Whilst fighting inflammation”*
### **What buyers complain about **
**Side Effects**12%
*“Unfortunately these had the opposite effect on me”*
**Color**10%
*“Warning your pee will be luminous yellow”*
**Size-Overall**9%
*“Very small box”*
**Smell**8%
*“Watch out packing product causes very smelly trumps”*
**Stress/Anxiety**7%
*“Caused me anxiety for some reason”*
**Functionality-Overall**7%
*“Doesn't work”*
**Vitamin**7%
*“Your body is filtering out unused vitamins”*
**Dosage**6%
*“Its near impossible in the UK to find this dose of B12 in one capsule. most places only do 100mg capsules at most”*
**Quality-Overall**3%
*“Rubbish”*
**Acid Regulator/Stomach Ache Relief**3%
*“Caused mega stomach aches”*
### **Top return reasons **
**Vitamin**100%
## **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.
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