Is d3 profitable to sell on Amazon United States?

The niche generates $6.2M/yr across 27 tracked products. 90-day search growth is -6.8%. Flapen's verdict: Worth a look (57/100).

How competitive is the d3 niche?

15 brands and 191 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 84% of demand.

What do buyers complain about in d3?

Top complaints mined from reviews: Vitamin, Size-Overall, Dosage. The return rate is 0.0%.

When does demand for d3 peak?

Demand peaks in Jan; the busiest month runs 1.6× the quietest.

What does it cost to enter the d3 niche?

Listings span $6.34–$34.70; the average listing price is $13.18 (sweet spot $15–$100). The average incumbent carries 51,700 reviews — the moat a new listing must climb.

d3

Worth a look

Shows searches that convert (19.7% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Conversion

Incredible19.7%

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

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Market size

Incredible$6.2M

$6.2M/yr · 2.4M searches

Price range

Good$6.34–$34.70

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

Avg price

Good$13.18

avg listing price — sweet spot $15–$100

Competition

Good54%

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

Brand share

Okay84%

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

Growth

Bad-6.8%

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

Quality gap

Bad4.8★

avg incumbent rating — lower means beatable quality

Review moat

Bad51,700.3

avg incumbent reviews — the moat a new listing must climb

According to Flapen's Amazon United States niche tracking, d3 is a $6.2M/yr Amazon United States market (2.4M searches/yr). The top 5 brands hold 84% of demand. Demand peaks in Jan. Verdict: Worth a look — 57/100.

Data updated Aug 5, 2026 · scored weekly · How we score niches

d3 market data

Units sold / yr: 400K–500K; avg 15,000–20,000/product
Revenue / yr: $5.3M–$6.6M; units × avg price
Conversion rate: 19.7%
Avg BSR: #53
Page quality: 0%
Prime: 100%
Sponsored: 89%
Out of stock: 0.0%
Avg brand age: 81 months
Avg seller age: 145 days

Competition & brand share

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 flat

Sellers

191

Top-5 brand share

84%

Top 20: 100%

Top-5 click share

54%

Top 20: 93%

Open market

14%

Nature Made31%
NatureWise21%
Nature's Bounty12%
NOW Foods11%
Bronson10%
Nutricost3%
Open — no brand owns it (9 brands, 14%)

Demand & seasonality

Weekly Amazon search volume, last 100 weeks — -6.8% search growth over the last 90 days.

Peak months: Jan · busiest ÷ quietest = 1.6×

Open Trend

Top d3 search terms

vitamin d3 5000 iu1.0M/yr -5.5%16.9% conv.
d3 vitamin492K/yr -2.3%14.6% conv.
vitamin d 5000 iu193K/yr -18.6%15.4% conv.
d3 5000 iu107K/yr +6.5%20.8% conv.
now vitamin d395K/yr +1.8%14.8% conv.
vitamin d 500073K/yr +2.6%14.5% conv.
vitamin d3 500060K/yr +6.6%13.2% conv.
vitamin d for women39K/yr -11.3%4.9% conv.
d3 500029K/yr +12.6%13.8% conv.
d3 vitamin 5000 iu47K/yr +1.1%13.3% conv.

All search terms

Top d3 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NatureWise Vitamin D3 5000IU Supplement Immune Support 360 Mini Softgels

NatureWise$13.604.7★195,696 rev

Nature Made Vitamin D3 5000 IU (125 mcg) 180 Vitamin D Softgels

Nature Made$13.364.8★67,638 rev

Bronson Vitamin D3 5000iu (125mcg) Non-GMO Gluten-Free Soy-Free 360 Tablets

Bronson$9.544.8★2,941 rev

Natures Bounty Vitamin D3 5000 IU Softgels 240 Count

Nature's Bounty$14.744.8★83,838 rev

NOW Foods Supplements Vitamin D-3 5 000 IU High Potency Structural Support* 240 Softgels

NOW Foods$11.614.8★51,526 rev

Newest

by launch date

VITBOOST Vitamin D3 K2 Complex - 5000 IU (125 mcg) D3 & K2 (MK-7) 90 mcg

VITBOOST$9.602,706 rev

1y ago

Bronson Vitamin D3 5000iu (125mcg) Non-GMO Gluten-Free Soy-Free 360 Tablets

Bronson$9.542,941 rev

3y ago

Vitamatic Vitamin D3 5000 IU (125 mcg) 500 Softgels Made in USA

Vitamatic$9.862,374 rev

3y ago

NatureWise Vitamin D3 5000IU Supplement Bone & Immune Health 30 Softgels

NatureWise$6.34195,696 rev

5y ago

Nature Made Vitamin D3 5000 IU (125 mcg) 360 Vitamin D Softgels

Nature Made$26.4767,638 rev

6y ago

What buyers say about d3

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

What buyers love

Vitamin24%

“Quality vitamin”

Quality-Overall19%

“the quality feels consistent”

Value For Money12%

“Fair price”

Ease Of Chewing/Swallowing7%

“Ease swallow”

Advertised Vs Actual Product7%

“Exactly as advertised”

Efficiency3%

“Works well”

Ease Of Use3%

“Easy to Take”

Dosage2%

“The dose and quantity are good”

Nutritional Content2%

“I have stayed healthy”

Energy Level1%

“Boost your energy”

What buyers complain about

Vitamin13%

“Not normal vitamin smell, more rancid”

Size-Overall8%

“Its a tiny capsule”

Dosage7%

“Too high of a dose for me”

Value For Money6%

“Not worth the price”

Advertised Vs Actual Product3%

“Very misleading”

Side Effects3%

“Caused terrible diarrhea and headaches”

Quality-Overall3%

“Terrible product”

Smell3%

“Strong perfume-like smell”

Functionality-Overall3%

“Cant provide results yet”

Ingredients-Overall2%

“Ingredients contain soybean oil”

Top return reasons

Value For Money34%

Vitamin15%

Dosage12%

Functionality-Overall7%

Ingredients-Overall6%

Smell4%

Adhesion/Stickiness4%