vitamin d test
Worth a lookShows low returns (0.3%), but soft demand (-28.5% this quarter) keeps it on the watch list.
Returns
Incredible0.3%return rate — above 5% kills the launch gate
Quality gap
Incredible3.9★avg incumbent rating — lower means beatable quality
Review moat
Great103.42avg incumbent reviews — the moat a new listing must climb
Avg price
Great$46.93avg listing price — sweet spot $15–$100
Price range
Great$16.43–$117.71cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Okay3.6%search→purchase rate — share of searches ending in a sale
Brand share
Okay81%top-5 brand share — brands hold most of the demand
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Market size
Bad$95K$95K/yr · 57K searches
Growth
Bad-28.5%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, vitamin d test is a $95K/yr Amazon United States market (57K searches/yr). The top 5 brands hold 81% of demand. Demand peaks in Feb. Verdict: Worth a look — 52/100.
Data updated Jul 14, 2026 · scored weekly · How we score niches
vitamin d test market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- $70K–$94K
- units × avg price
- Conversion rate
- 3.6%
- Avg BSR
- #725
- Page quality
- 0%
- Prime
- 92%
- Sponsored
- 75%
- Out of stock
- 18.1%
- Avg brand age
- 57 months
- Avg seller age
- 169 days
Competition & brand share
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.Brands
10 flat
Sellers
10
Top-5 brand share
81%
Top 20: 100%
Top-5 click share
66%
Top 20: 100%
Open market
13%
- krojpen34%
- Kueysing15%
- Everlywell15%
- KuweiCheck8%
- Verisana8%
- Zinora6%
- Open — no brand owns it (4 brands, 13%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -28.5% search growth over the last 90 days.Peak months: Feb · busiest ÷ quietest = 2.1×
Top vitamin d test search terms
- vitamin d test kit at home19K/yr
- vitamin d test19K/yr
- vitamin d test kit8K/yr
- vitamin d testing kit for home2K/yr
- at home vitamin d test3K/yr
- vitamin d test at home3K/yr
- vitamin d testing kit2K/yr
Top vitamin d test 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.
All 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Vitamin d Test kit at Home he Result is Highly Accurate Easy to Read and use
krojpen$19.642.6★58 rev
Everlywell At-Home Vitamin D and Inflammation Test Collection Kit for Women and Men with Accurate Results from a CLIA-Certified Lab Within Days for Ages 18 Plus
Everlywell$95.894.0★129 rev
Vitamin d Test kit at Home he Result is Highly Accurate Easy to Read and usePack of 2
krojpen$27.973.0★22 rev
Kueysing Vita D Deficiency at Home 2 Test kit
Kueysing$23.005.0★1 rev
KuweiCheck Vita D Deficiency at Home Test kit
KuweiCheck$16.432.9★20 rev
Newest
by launch date![Vitamin D Test Kit at Home [2 Tests] for Testing Vitamin D Deficiency](https://m.media-amazon.com/images/I/41vnGWMkPnL.jpg)
Vitamin D Test Kit at Home [2 Tests] for Testing Vitamin D Deficiency
Generic$33.862 rev
Kueysing Vita D Deficiency at Home 2 Test kit
Kueysing$23.001 rev
Vita D Deficiency at Home Test kit
Kueysing$18.211 rev
KuweiCheck Vita D Deficiency at Home Test kit
KuweiCheck$16.4320 rev
![Vitamin D Test Kit at Home [2 Tests] for Testing Vitamin D Deficiency](https://m.media-amazon.com/images/I/41YF+aPr3WL.jpg)
Vitamin D Test Kit at Home [2 Tests] for Testing Vitamin D Deficiency
Zinora$30.4712 rev
Trending
90-day click momentumVitamin D Test Kit at Home [2 Tests] for Testing Vitamin D Deficiency
Generic$33.865.0★
Vita D Deficiency at Home Test kit
Kueysing$18.215.0★
Kueysing Vita D Deficiency at Home 2 Test kit
Kueysing$23.005.0★
Sunray Calcifediol Vitamin D Supplement | Fast-Acting Once-Weekly Vitamin D | High Bioavailability 25-Hydroxyvitamin D | Immune Mood Bone & Muscle Support | 4 Capsules
Immunotec$31.044.4★
Everlywell At-Home Vitamin D and Inflammation Test Collection Kit for Women and Men with Accurate Results from a CLIA-Certified Lab Within Days for Ages 18 Plus
Everlywell$95.894.0★
What buyers say about vitamin d test
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to Use”
“Nice kit”
“The instructions were clear”
“I purchased this vitamin D supplement with good experience”
“accuracy for me was great”
“Great allergic test kit”
“It covers a huge variety of foods, drinks, vitamins, minerals, and gut health markers, which made the results feel very detailed and personalized”
“results returned as described”
“Really good product to test the sensitivity of food”
“Fixing my energy”
What buyers complain about
“Instructions are very difficult to understand”
“This test was not accurate for me at all”
“Waste of money”
“This is NOT a standard hair analysis”
“Not enough salmon or natural vitamin d up north”
“havent recd testing results”
“it doesn't provide this information”
“I ended up in the ICU needing a transfusion because I had such terrible Iron anemia”
“very hard to read or understand”
“I believe its a scam”
Top return reasons
Common questions
- Is vitamin d test profitable to sell on Amazon United States?
- The niche generates $95K/yr across 12 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -28.5%. Flapen's verdict: Worth a look (52/100).
- How competitive is the vitamin d test niche?
- 10 brands and 10 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 81% of demand.
- What do buyers complain about in vitamin d test?
- Top complaints mined from reviews: Instructions/User Manual/Troubleshooting, Accuracy-Overall, Value For Money. The return rate is 0.3%.
- When does demand for vitamin d test peak?
- Demand peaks in Feb; the busiest month runs 2.1× the quietest.
- What does it cost to enter the vitamin d test niche?
- Listings span $16.43–$117.71; the average listing price is $46.93 (sweet spot $15–$100). The average incumbent carries 103 reviews — the moat a new listing must climb.