Vitamin D 400iu
FailThe top 5 products take 100% of clicks, so Vitamin D 400iu is a Fail.
- Flapen Score
- 27 / 100Ranks 2,022 of 2,035 Health & Personal Care niches · −21 vs the category median of 4827
- Market size
- £39K/yr55K searches / yr
- 90-day growth
- -49.0%search demand this quarter
- Competition
- 100%top-5 click share · 4 brands · 16 sellers
Flapen Score
Vitamin D 400iu against its category
The dotted line is the Health & Personal Care average. Past it, Vitamin D 400iu is stronger. Inside it, weaker.
Market
The Vitamin D 400iu market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for Vitamin D 400iu 55K times last year and spent an estimated £39K. All 4 brands take every click. Demand peaks in Jan–Feb–Oct–Nov. Flapen scores it 27 out of 100, a Fail.
01 · Demand
17.5% of searches ended in a purchase last week.
Shoppers searched for this 55K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 17.5% of those searches ended in a purchase. Searches in the last 90 days moved -49.0% against the 90 days before. Searches, conversion and average price together put the market at an estimated £39K a year.
- Searches, last 12 months
- 55K
- Growth, 90 days vs prior 90
- -49.0%
- Conversion, latest week
- 17.5%
- Market size, estimated
- £39Ka year
- Peak month
- November2.8× the quietest month
- Top search term
- vitamin d 400iu19K searches a year
02 · Price
A sale here is worth £4.03.
Listings sell for £4.03 on average, from £2.63 to £7.03. Amazon reports units sold in ranges. This niche sold 10K to 13K a year. The average listing sells 1,500 to 2,000 of them. At £4.03 that is £6K to £8K a year per listing.
- Average price
- £4.03under the $15 to $100 sweet spot
- Price range
- £2.63–£7.03
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 10K–13K
- Units per listing a year
- 1,500–2,000
- Revenue per listing a year
- £6K–£8K
- Returns
- 0.0%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is ads and reviews.
100% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #41 within Vitamins. It carries 1,793 reviews at 4.60 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 100%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #41in Vitamins
- Average rating
- 4.60 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 1,793per listing
- Listings tracked
- 4
04 · Newcomers
Amazon counts 0 of last year's 1 launches as successful.
1 products launched here in the last 12 months. Amazon counts 0 of them as successful launches, new products that hit its first-year sales bar. The brands on the shelf have sold for 79 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 79 months
Products
Top Vitamin D 400iu products & what they sell for
Every tracked product: its share of the shelf, its reviews, and its price.
Top sellers
by 90-day click share
Vitamin D Tablets 400IU Vitabiotics Ultra
- Price
- £2.63
- Rating
- 4.7/5
- Reviews
- 1,658
- Age
- 2y ago

Fultium Vitamin D3 400 IU 10g |90 Tablets|Recommended Daily Dose Vitamin D Supplement | Immune Bone & Muscle Support | from The UKs No.1 Vitamin D Prescription Brand | Vegetarian | Food Supplement
- Price
- £2.80
- Rating
- 4.6/5
- Reviews
- 58
- Age
- 5mo ago

Natures Aid Vitamin D3 10g (400IU) High Strength Vitamin D Supplement Supports Bones Muscles & Immunity Vegan Gluten-Free Non-GMO 90 Tablets Essential Daily Nutrient
- Price
- £3.65
- Rating
- 4.6/5
- Reviews
- 5,083
- Age
- 17y ago

Certified Vegan 400IU Vitamin D3 120 Days Tablets for Pregnancy Nursing and Seniors - NHS Approved
- Price
- £7.03
- Rating
- 4.5/5
- Reviews
- 374
- Age
- 4y ago
Trending
90-day click momentum
Fultium Vitamin D3 400 IU 10g |90 Tablets|Recommended Daily Dose Vitamin D Supplement | Immune Bone & Muscle Support | from The UKs No.1 Vitamin D Prescription Brand | Vegetarian | Food Supplement
- Price
- £2.80
- Rating
- 4.6/5
- Reviews
- 58
- Age
- 5mo ago

Vitamin D Tablets 400IU Vitabiotics Ultra
- Price
- £2.63
- Rating
- 4.7/5
- Reviews
- 1,658
- Age
- 2y ago

Natures Aid Vitamin D3 10g (400IU) High Strength Vitamin D Supplement Supports Bones Muscles & Immunity Vegan Gluten-Free Non-GMO 90 Tablets Essential Daily Nutrient
- Price
- £3.65
- Rating
- 4.6/5
- Reviews
- 5,083
- Age
- 17y ago

Certified Vegan 400IU Vitamin D3 120 Days Tablets for Pregnancy Nursing and Seniors - NHS Approved
- Price
- £7.03
- Rating
- 4.5/5
- Reviews
- 374
- Age
- 4y ago
Newest
by launch date
Fultium Vitamin D3 400 IU 10g |90 Tablets|Recommended Daily Dose Vitamin D Supplement | Immune Bone & Muscle Support | from The UKs No.1 Vitamin D Prescription Brand | Vegetarian | Food Supplement
- Price
- £2.80
- Rating
- 4.6/5
- Reviews
- 58
- Age
- 5mo ago

Vitamin D Tablets 400IU Vitabiotics Ultra
- Price
- £2.63
- Rating
- 4.7/5
- Reviews
- 1,658
- Age
- 2y ago

Certified Vegan 400IU Vitamin D3 120 Days Tablets for Pregnancy Nursing and Seniors - NHS Approved
- Price
- £7.03
- Rating
- 4.5/5
- Reviews
- 374
- Age
- 4y ago

Natures Aid Vitamin D3 10g (400IU) High Strength Vitamin D Supplement Supports Bones Muscles & Immunity Vegan Gluten-Free Non-GMO 90 Tablets Essential Daily Nutrient
- Price
- £3.65
- Rating
- 4.6/5
- Reviews
- 5,083
- Age
- 17y ago
Competition
Competition: brands, sellers & click share
The top 5 products take 100% of clicks. A locked shelf that new listings rarely crack.
Brands
4 falling
Sellers
16
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
100%
Top 20: 100%
Open market
0%
- Vitabiotics Ultra53%
- Fultium23%
- Natures Aid19%
- PROHEALTH4%
- Open — no brand owns it (0%)
Demand
Vitamin D 400iu search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Jan, Feb, Oct, Nov · busiest ÷ quietest = 2.8×
Search terms
Top Vitamin D 400iu search terms shoppers use
The exact words shoppers type, with yearly volume, growth, and conversion.
- vitamin d 400iu19K/yr
- vitamin d3 400iu8K/yr
- vitamin d 400 iu7K/yr
- vitamin d 10 micrograms10K/yr
- vitamin d 10mcg5K/yr
- vitamin d 10mg4K/yr
- vitamin d 4003K/yr
Reviews and returns
What reviews say buyers love and hate about Vitamin D 400iu
What buyers praise, what they complain about and why they send it back, from the reviews.
Complain
The capsules are small
Slightly bigger tablets than I expected for this dose
Small in size
Slightly bigger tablets than I expected for this dose
Its difficult to assess the beneficial impact of this supplement after only taking it for a few days
quite frankly you will overdose on them
Don't get nearly enough vit D via the sun
when i opened vitamins there was a green residue underneath lid
I had 400 tablet vitamins which were smaller than this thing
96 doesn't work
I find tablets are always harder to swallow than capsules
Small to swallow
Love
Good Value
Good value for money
Worth it
Overall, this seems like a good basic vitamin D supplement
Vitamins, easy to swallow good amount of supply
This Vitamin D3 supplement is a great daily choice for supporting overall health
ideal to swallow
easy to ingest
Easy to swallow
Quality feels reliable and consistent, and the bottle has lasted well with regular use
Happy with the quality
Consistent product and trusted brand
Does the job
Exactly what I wanted
Does what it says
Keep looking
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Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Vitamin D 400iu questions
Answered from the same tracked data.









