---
title: "Riboflavin 400mg — $778K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/riboflavin-400mg"
last_updated: "2026-08-11T21:49:15.860Z"
locale: en
meta:
description: "Niche score 48/100 · $778K/yr market · 280K searches/yr · $16.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $778K/yr market · 280K searches/yr · $16.58 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Riboflavin 400mg — $778K/yr Amazon US Niche (2026) - Flapen"
---
# **riboflavin 400mg**
**Skip it**
A concentrated shelf (top 5 take 89% of clicks) — this niche doesn't clear our bar today.
Market size 72Growth 21Conversion 98Competition 9Returns 100Price range 66Avg price 79Brand share 27Review moat 28Quality gap 20
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****16.7%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$16.58**
avg listing price — sweet spot $15–$100
**Market size**
**Good****$778K**
$778K/yr · 280K searches
**Price range**
**Good****$6.91–$30.99**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****3,668.56**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****89%**
top-5 brand share — brands hold most of the demand
**Growth**
**Bad****-8.4%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****89%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, riboflavin 400mg is a $778K/yr Amazon United States market (280K searches/yr). The top 5 brands hold 89% of demand. Verdict: Skip it — 48/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **riboflavin 400mg market data**
- **Units sold / yr**
- **50K–60K**
- avg 5,000–6,000/product
- **Revenue / yr**
- **$829K–$995K**
- units × avg price
- **Conversion rate**
- **16.7%**
- **Avg BSR**
- **#104**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **85 months**
- **Avg seller age**
- **158 days**
## **Competition & brand share**
The top 5 products capture 89% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **▲rising
**Sellers**
**10**
**Top-5 brand share**
**89%**
Top 20: 100%
**Top-5 click share**
**89%**
Top 20: 100%
**Open market**
**8%**
- Nutricost42% - ForestLeaf21% - Healthfare11% - Carlyle10% - THORNE4% - Deal Supplement3% - Open — no brand owns it (3 brands, 8%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -8.4% search growth over the last 90 days.
7K5KSpike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/riboflavin-400mg/trend)
## **Top riboflavin 400mg search terms**
- **riboflavin 400mg**123K/yr-12.7%15.8% conv. - **vitamin b2 400 mg**58K/yr-13.4%16.1% conv. - **b2 400mg**28K/yr+52.6%17.1% conv. - **b2 riboflavin 400mg**21K/yr+17.0%14.9% conv. - **vitamin b2 400mg**5K/yr+33.8%13.3% conv. - **riboflavin 400 mg**5K/yr-13.3%14.5% conv. - **vit b2 riboflavin 400mg**4K/yr+27.6%16.1% conv. - **vitamin b2 500mg**2K/yr+283.0%10.0% conv. - **b2 vitamin 400mg**23K/yr-85.8%7.8% conv. - **vitamin b 2 riboflavin 400**3K/yr-10.8%14.5% conv. [**All search terms **](https://flapen.com/research/us/health-household/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%$117K30%$233K45%$350K60%$467K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Nutricost Vitamin B2 (Riboflavin) 400mg 120 Capsules Gluten Free**Nutricost**$14.62**4.7★16,288 rev](https://www.amazon.com/dp/B01IG5JH90) [2**ForestLeaf Vitamin B2 Riboflavin 400mg - Energy Skin & Cellular Health Supplement - Nervous System Support - Vitamin B 2 VIT B - Non-GMO & Gluten Free - B2 Vitamin 400mg Vegetable Capsules 90 Count**ForestLeaf**$16.82**4.7★10,803 rev](https://www.amazon.com/dp/B07NF6B6Y1) [3**Healthfare Vitamin B2 Riboflavin 400mg | 180 Vegan Capsules | High Potency | Non-GMO | Gluten-Free | Made in USA**Healthfare**$10.07**4.7★1,170 rev](https://www.amazon.com/dp/B0B7VJMBL8) [4**Carlyle Vitamin B-2 400mg | 180 Count | B2 Riboflavin**Carlyle**$6.91**4.6★1,172 rev](https://www.amazon.com/dp/B09PMXYTCF) [5**THORNE - Riboflavin 5-Phosphate - Bioactive Tissue Ready Form of Vitamin B2 for Methylation Support* - Vitamin B2 Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 60 Capsules**THORNE**$30.99**4.8★586 rev](https://www.amazon.com/dp/B0797MLY4M)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Vitamin B2 Riboflavin 400mg | 240 Softgels with Coconut Oil | Highly Bioavailable | Extra Strength Vitamin B Energy Supplements | Essential B Vitamins for Women & Men | Non-GMO Gluten Free**Micro Ingredients**$18.29**220 rev1y ago](https://www.amazon.com/dp/B0F5M2GGC3) [**NatureBell Vitamin B2 (Riboflavin) 400mg - 240 Capsules - Supplement for Energy Skin & Cellular Health* - Non-GMO & Gluten Free - Easily Absorbed**NatureBell**$19.84**640 rev3y ago](https://www.amazon.com/dp/B0BSP461K1) [**Healthfare Vitamin B2 Riboflavin 400mg | 180 Vegan Capsules | High Potency | Non-GMO | Gluten-Free | Made in USA**Healthfare**$10.07**1,170 rev4y ago](https://www.amazon.com/dp/B0B7VJMBL8) [**Carlyle Vitamin B-2 400mg | 180 Count | B2 Riboflavin**Carlyle**$6.91**1,172 rev4y ago](https://www.amazon.com/dp/B09PMXYTCF) [**DEAL SUPPLEMENT Vitamin B2 400mg (Riboflavin) | with Magnesium Glycinate 400mg 240 Capsules 2 in 1 Support Healthy Nervous System Mood Blood & Energy Production Non-GMO**Deal Supplement**$19.07**1,324 rev6y ago](https://www.amazon.com/dp/B085PZLP29)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**THORNE - Riboflavin 5-Phosphate - Bioactive Tissue Ready Form of Vitamin B2 for Methylation Support* - Vitamin B2 Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 60 Capsules**THORNE**$30.99**4.8★**▲ 40%**](https://www.amazon.com/dp/B0797MLY4M) [**Healthfare Vitamin B2 Riboflavin 400mg | 180 Vegan Capsules | High Potency | Non-GMO | Gluten-Free | Made in USA**Healthfare**$10.07**4.7★**— 8%**](https://www.amazon.com/dp/B0B7VJMBL8) [**DEAL SUPPLEMENT Vitamin B2 400mg (Riboflavin) | with Magnesium Glycinate 400mg 240 Capsules 2 in 1 Support Healthy Nervous System Mood Blood & Energy Production Non-GMO**Deal Supplement**$19.07**4.7★**— 7%**](https://www.amazon.com/dp/B085PZLP29) [**NatureBell Vitamin B2 (Riboflavin) 400mg - 240 Capsules - Supplement for Energy Skin & Cellular Health* - Non-GMO & Gluten Free - Easily Absorbed**NatureBell**$19.84**4.6★**— 6%**](https://www.amazon.com/dp/B0BSP461K1) [**ForestLeaf Vitamin B2 Riboflavin 400mg - Energy Skin & Cellular Health Supplement - Nervous System Support - Vitamin B 2 VIT B - Non-GMO & Gluten Free - B2 Vitamin 400mg Vegetable Capsules 90 Count**ForestLeaf**$16.82**4.7★**— 2%**](https://www.amazon.com/dp/B07NF6B6Y1)
**~~View all trending →~~**
## **What buyers say about riboflavin 400mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**22%
*“It has been of a consistent quality”*
**Vitamin**18%
*“This vitamin is easy to swallow”*
**Advertised Vs Actual Product**10%
*“Exactly as pictured”*
**Value For Money**9%
*“the price is worth it”*
**Dosage**5%
*“Large which is expected for the dose”*
**Ease Of Chewing/Swallowing**4%
*“Easy to swallow and digest”*
**Sleep Quality**3%
*“does help with sleep”*
**Energy Level**3%
*“Gives you great energy”*
**Efficiency**2%
*“Works well”*
**Side Effects**2%
*“I've only been taking for 2 days so I'm excited to see the outcome”*
### **What buyers complain about **
**Dosage**14%
*“This is not a 400 mg pill”*
**Size-Overall**9%
*“Although the capsules are large”*
**Color**7%
*“I didnt like how bright yellow my urine look after taking these”*
**Sleep Quality**5%
*“It was advertise to help you sleep. It did absolutely nothing for me.”*
**Advertised Vs Actual Product**4%
*“Deceptive marketing”*
**Allergies**4%
*“I had a severe allergic reaction to this”*
**Taste-Overall**4%
*“Moldy taste and smell”*
**Ingredients-Overall**3%
*“NEVER before orange powder inside the entire bottle & caps”*
**Energy Level**3%
*“I noticed less energy”*
**Quality-Overall**3%
*“Very disappointed with the lack of quality control”*
### **Top return reasons **
**Dosage**33%
**Visibility**33%
**Leak-Proof**33%
## **Common questions**
- **Is riboflavin 400mg profitable to sell on Amazon United States?**
- The niche generates $778K/yr across 9 tracked products. 90-day search growth is -8.4%. Flapen's verdict: Skip it (48/100).
- **How competitive is the riboflavin 400mg niche?**
- 9 brands and 10 sellers compete. The top 5 products take 89% of clicks and top 5 brands hold 89% of demand.
- **What do buyers complain about in riboflavin 400mg?**
- Top complaints mined from reviews: Dosage, Size-Overall, Color. The return rate is 0.0%.
- **When does demand for riboflavin 400mg peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the riboflavin 400mg niche?**
- Listings span $6.91–$30.99; the average listing price is $16.58 (sweet spot $15–$100). The average incumbent carries 3,669 reviews — the moat a new listing must climb.
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