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.

riboflavin 400mg

Skip it

A concentrated shelf (top 5 take 89% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible16.7%

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

Okay3,668.56

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay89%

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

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad89%

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

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

Top-5 brand share

89%

Top 20: 100%

Top-5 click share

89%

Top 20: 100%

Open market

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.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top riboflavin 400mg search terms

riboflavin 400mg123K/yr -12.7%15.8% conv.
vitamin b2 400 mg58K/yr -13.4%16.1% conv.
b2 400mg28K/yr +52.6%17.1% conv.
b2 riboflavin 400mg21K/yr +17.0%14.9% conv.
vitamin b2 400mg5K/yr +33.8%13.3% conv.
riboflavin 400 mg5K/yr -13.3%14.5% conv.
vit b2 riboflavin 400mg4K/yr +27.6%16.1% conv.
vitamin b2 500mg2K/yr +283.0%10.0% conv.
b2 vitamin 400mg23K/yr -85.8%7.8% conv.
vitamin b 2 riboflavin 4003K/yr -10.8%14.5% 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 9 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Nutricost Vitamin B2 (Riboflavin) 400mg 120 Capsules Gluten Free

Nutricost$14.624.7★16,288 rev

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$16.824.7★10,803 rev

Healthfare$10.074.7★1,170 rev

Carlyle Vitamin B-2 400mg | 180 Count | B2 Riboflavin

Carlyle$6.914.6★1,172 rev

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$30.994.8★586 rev

Newest

by launch date

Micro Ingredients$18.29220 rev

1y ago

NatureBell Vitamin B2 (Riboflavin) 400mg - 240 Capsules - Supplement for Energy Skin & Cellular Health* - Non-GMO & Gluten Free - Easily Absorbed

NatureBell$19.84640 rev

3y ago

Healthfare$10.071,170 rev

4y ago

Carlyle Vitamin B-2 400mg | 180 Count | B2 Riboflavin

Carlyle$6.911,172 rev

4y ago

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$19.071,324 rev

6y ago

What buyers say about riboflavin 400mg

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

What buyers love

Quality-Overall22%

“It has been of a consistent quality”

Vitamin18%

“This vitamin is easy to swallow”

Advertised Vs Actual Product10%

“Exactly as pictured”

Value For Money9%

“the price is worth it”

Dosage5%

“Large which is expected for the dose”

Ease Of Chewing/Swallowing4%

“Easy to swallow and digest”

Sleep Quality3%

“does help with sleep”

Energy Level3%

“Gives you great energy”

Efficiency2%

“Works well”

Side Effects2%

“I've only been taking for 2 days so I'm excited to see the outcome”

What buyers complain about

Dosage14%

“This is not a 400 mg pill”

Size-Overall9%

“Although the capsules are large”

Color7%

“I didnt like how bright yellow my urine look after taking these”

Sleep Quality5%

“It was advertise to help you sleep. It did absolutely nothing for me.”

Advertised Vs Actual Product4%

“Deceptive marketing”

Allergies4%

“I had a severe allergic reaction to this”

Taste-Overall4%

“Moldy taste and smell”

Ingredients-Overall3%

“NEVER before orange powder inside the entire bottle & caps”

Energy Level3%

“I noticed less energy”

Quality-Overall3%

“Very disappointed with the lack of quality control”

Top return reasons

Dosage33%

Visibility33%

Leak-Proof33%

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.