Vitamin D 400 Iu
FailThe average product has 16,363 reviews to catch up to, so Vitamin D 400 Iu is a Fail.
- Flapen Score
- 46 / 100Ranks 9,041 of 14,768 Health & Household niches · −3 vs the category median of 4946
- Market size
- $121K/yr93K searches / yr
- 90-day growth
- +3.8%search demand this quarter
- Competition
- 60%top-5 click share · 16 brands · 111 sellers
Flapen Score
Vitamin D 400 Iu against its category
The dotted line is the Health & Household average. Past it, Vitamin D 400 Iu is stronger. Inside it, weaker.
Market
The Vitamin D 400 Iu market on Amazon at a glance
Shoppers on Amazon United States searched for Vitamin D 400 Iu 93K times last year and spent an estimated $121K. The top 5 brands take 70% of clicks. Demand peaks in May–Jul. Flapen scores it 46 out of 100, a Fail.
01 · Demand
An estimated 11.4% of those searches ended in a purchase.
Shoppers searched for this 93K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 11.4% of those searches ended in a purchase. Searches in the last 90 days moved +3.8% against the 90 days before. Searches, conversion and average price together put the market at an estimated $121K a year.
- Searches, last 12 months
- 93K
- Growth, 90 days vs prior 90
- +3.8%
- Conversion, latest week
- 11.4%
- Market size, estimated
- $121Ka year
- Peak month
- July1.7× the quietest month
- Top search term
- vitamin d 400 iu18K searches a year
02 · Price
A sale here is worth $11.42.
Listings sell for $11.42 on average, from $4.86 to $18.97. Amazon reports units sold in ranges. This niche sold 13K to 15K a year. The average listing sells 750 to 1,000 of them. At $11.42 that is $9K to $11K a year per listing.
- Average price
- $11.42under the $15 to $100 sweet spot
- Price range
- $4.86–$18.97
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 13K–15K
- Units per listing a year
- 750–1,000
- Revenue per listing a year
- $9K–$11K
- Returns
- 0.0%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
68% of listings pay for placement with sponsored ads. 91% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #609 within Vitamin D. It carries 16,363 reviews at 4.69 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 68%
- Prime listings
- 91%
- Out of stock, average day
- 0.0%
- Average rank
- #609in Vitamin D
- Average rating
- 4.69 starsAmazon United States average 4.42 stars
- Average reviews
- 16,363per listing
- Listings tracked
- 22
04 · Newcomers
1 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 101 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 101 months
Products
Top Vitamin D 400 Iu products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Aug 5, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Natures Truth Vitamin D3 400 IU 100 Count
- Price
- $6.85
- Rating
- 4.7/5
- Reviews
- 1,046
- Age
- 9y ago

NOW Supplements Vitamin D-3 400 IU Strong Bones* Structural support* 180 Softgels
- Price
- $4.86
- Rating
- 4.7/5
- Reviews
- 5,350
- Age
- 22y ago

Carlyle Vitamin D3 400iu (10mcg) | 400 Tablets | Value Size
- Price
- $9.19
- Rating
- 4.7/5
- Reviews
- 374
- Age
- 4y ago

Pure Encapsulations Vitamin D3 10 mcg (400 IU) | Hypoallergenic Support for Bone Breast Cardiovascular Colon and Immune Health* | 120 Capsules
- Price
- $18.01
- Rating
- 4.6/5
- Reviews
- 306
- Age
- 18y ago

Swanson Vitamin D3 Bone Health 400 IU (10 mcg) 250 Capsules
- Price
- $7.44
- Rating
- 4.4/5
- Reviews
- 56
- Age
- 21y ago
Trending
estimated 90-day click momentum
Bronson Vitamin D3 1000 IU (25mcg) Low Dose Vitamin D 360 Tablets
- Price
- $9.85
- Rating
- 4.7/5
- Reviews
- 93
- Age
- 7mo ago

Swanson Vitamin D3 Bone Health 400 IU (10 mcg) 250 Capsules
- Price
- $7.44
- Rating
- 4.4/5
- Reviews
- 56
- Age
- 21y ago

NOW Foods Vitamin D-3 400 IU Softgels 2 pk 180 Count (Pack of 2)
- Price
- $11.03
- Rating
- 4.7/5
- Reviews
- 620
- Age
- 19y ago

Nature Made Vitamin D3 1000 IU (25 mcg) 180 Vitamin D Softgels
- Price
- $8.67
- Rating
- 4.8/5
- Reviews
- 60,500
- Age
- 15y ago

Natural Nutra Vitamin D3 400 IU Softgels Gluten-Free Vitamin D 100 Count
- Price
- $15.05
- Rating
- 4.6/5
- Reviews
- 172
- Age
- 10y ago
Newest
by launch date
Bronson Vitamin D3 1000 IU (25mcg) Low Dose Vitamin D 360 Tablets
- Price
- $9.85
- Rating
- 4.7/5
- Reviews
- 93
- Age
- 7mo ago

Vitamin D3 10 mcg (400 IU) 200 Softgels - Dietary Supplement (Pack of 1)
- Price
- $15.01
- Rating
- 4.7/5
- Reviews
- 50
- Age
- 2y ago

Natures Truth Vitamin D3 5000 IU Softgels | 400 Count | High Potency | Non-GMO & Gluten Free Supplement
- Price
- $18.97
- Rating
- 4.7/5
- Reviews
- 325
- Age
- 3y ago

Natures Truth Vitamin D3 Gummies | 5000 IU | 60 Count | Peach Flavor | Vegetarian Non-GMO & Gluten Free Supplement
- Price
- $9.89
- Rating
- 4.8/5
- Reviews
- 795
- Age
- 4y ago

Carlyle Vitamin D3 400iu (10mcg) | 400 Tablets | Value Size
- Price
- $9.19
- Rating
- 4.7/5
- Reviews
- 374
- Age
- 4y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 60% of clicks. Leaders hold, but buyers still shop past them.
Brands
16 rising
Sellers
111
Est. top-5 brand share
70%
Top 20: 100%
Est. top-5 click share
60%
Top 20: 98%
Open market
24%
- Nature's Truth26%
- NOW Foods17%
- Carlyle11%
- Swanson8%
- Pure Encapsulations7%
- Nature Made7%
Demand
Vitamin D 400 Iu search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: May, Jul · busiest ÷ quietest = 1.7×
Search terms
Top Vitamin D 400 Iu search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- vitamin d 400 iu18K/yr
- vitamin d3 400 iu16K/yr
- vitamin d3 400iu8K/yr
- vitamin d 500 iu9K/yr
- vitamin d3 500 iu5K/yr
- vitamin d 5005K/yr
- low dose vitamin d5K/yr
- d3 400 iu4K/yr
- vitamin d 4003K/yr
- natures truth d33K/yr
Reviews and returns
What reviews say buyers love and hate about Vitamin D 400 Iu
We read the reviews and the return reasons for every product selling here.
“leaking issue”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
18 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Vitamin D 400 Iu questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









