vitamin d test kit
Skip itPrices mostly outside the sweet spot ($4.88–$8.48) — this niche doesn't clear our bar today.
Returns
Incredible0.2%return rate — above 5% kills the launch gate
Quality gap
Incredible3.8★avg incumbent rating — lower means beatable quality
Review moat
Great186.43avg incumbent reviews — the moat a new listing must climb
Conversion
Great8.4%search→purchase rate — share of searches ending in a sale
Avg price
Bad£6.34avg listing price — sweet spot $15–$100
Brand share
Bad97%top-5 brand share — brand-locked demand
Market size
Bad£21K£21K/yr · 39K searches
Competition
Bad93%top-5 click share — a locked-up shelf
Growth
Bad-41.3%90-day search growth — must beat 0% to launch
Price range
Bad£4.88–£8.48cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, vitamin d test kit is a £21K/yr Amazon United Kingdom market (39K searches/yr). The top 5 brands hold 97% of demand. Demand peaks in Jan–Feb–Mar. Verdict: Skip it — 36/100.
Data updated Jul 24, 2026 · scored weekly · How we score niches
vitamin d test kit market data
- Units sold / yr
- 3K–4K
- avg 250–500/product
- Revenue / yr
- £19K–£25K
- units × avg price
- Conversion rate
- 8.4%
- Avg BSR
- #243
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 43%
- Out of stock
- 1.5%
- Avg brand age
- 53 months
- Avg seller age
- 203 days
Competition & brand share
The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.Brands
6 falling
Sellers
10
Top-5 brand share
97%
Top 20: 100%
Top-5 click share
93%
Top 20: 100%
Open market
0%
- One Step57%
- Newfoundland28%
- KP Pharma5%
- MediMad4%
- Berkeley Health3%
- ALLTEST3%
- Open — no brand owns it (0%)
Demand & seasonality
Weekly Amazon search volume, last 74 weeks — -41.3% search growth over the last 90 days.Peak months: Jan, Feb, Mar · busiest ÷ quietest = 3.9×
Top vitamin d test kit search terms
- vitamin d test kit19K/yr
- vitamin d test14K/yr
- vitamin d test kit home uk6K/yr
Top vitamin d test kit 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 7 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Vitamin D Test Kit - Check for Deficiency & Insufficiency - 1 Vitamin D Testing Kit - Easy Home Testing for Accurate Results
One Step£4.914.0★360 rev
Newfoundland Vitamin D Test Kit - UV Deficiency Detection - 99% Accurate Home Test for Vitamin D Levels - Certified by CE - Blood Test Kit for D3 & D2 - Sunlight & UVB Single Person Testing
Newfoundland£6.663.8★225 rev
2 x Vitamin D Level Insufficiency Deficiency Testing Kits (2 Tests)
One Step£7.513.7★214 rev
KP Pharma Vitamin D Test Kit Check for UV Deficiency & Insufficiency Level at Home Clinically Tested Certified by CE Easy and Quick Test Kit for Accurate Results - 1 Vitamin D Testing Kit
KP Pharma£4.883.5★48 rev
Vitamin D Level Insufficiency Deficiency Self Testing Kit Rapid Test Cassette
MediMad£4.913.9★49 rev
Newest
by launch dateKP Pharma Vitamin D Test Kit Check for UV Deficiency & Insufficiency Level at Home Clinically Tested Certified by CE Easy and Quick Test Kit for Accurate Results - 1 Vitamin D Testing Kit
KP Pharma£4.8848 rev
Berkeley Health Vitamin D Test Kit Easy Home Use Clear Results (1 Test)
Berkeley Health£8.4867 rev
Newfoundland Vitamin D Test Kit - UV Deficiency Detection - 99% Accurate Home Test for Vitamin D Levels - Certified by CE - Blood Test Kit for D3 & D2 - Sunlight & UVB Single Person Testing
Newfoundland£6.66225 rev
Vitamin D Level Insufficiency Deficiency Self Testing Kit Rapid Test Cassette
MediMad£4.9149 rev
2 x Vitamin D Level Insufficiency Deficiency Testing Kits (2 Tests)
One Step£7.51214 rev
Trending
90-day click momentumVitamin D Test Kit - Check for Deficiency & Insufficiency - 1 Vitamin D Testing Kit - Easy Home Testing for Accurate Results
One Step£4.914.0★
Newfoundland Vitamin D Test Kit - UV Deficiency Detection - 99% Accurate Home Test for Vitamin D Levels - Certified by CE - Blood Test Kit for D3 & D2 - Sunlight & UVB Single Person Testing
Newfoundland£6.663.8★
KP Pharma Vitamin D Test Kit Check for UV Deficiency & Insufficiency Level at Home Clinically Tested Certified by CE Easy and Quick Test Kit for Accurate Results - 1 Vitamin D Testing Kit
KP Pharma£4.883.5★
Berkeley Health Vitamin D Test Kit Easy Home Use Clear Results (1 Test)
Berkeley Health£8.483.9★
Vitamin D Level Insufficiency Deficiency Self Testing Kit Rapid Test Cassette
MediMad£4.913.9★
What buyers say about vitamin d test kit
What buyers praise and complain about, mined from review topics.What buyers love
“Easy to use”
“Quality is great”
“instructions are clear”
“Value for money as it does work”
What buyers complain about
“as sometimes these may not be accurate”
“suspected I had a vitamin D deficiency since Ive had them previously”
“The test comes with two lancets, and the manual is quite difficult to read and follow”
“It doesn't work”
“A waste of money”
“Absolutely rubbish at being able to interpret the results”
“So just 3 stars as not clear at all”
“It is quite difficult to interpret the results”
“as my top line appeared much darker than the examples on the results card”
Top return reasons
Common questions
- Is vitamin d test kit profitable to sell on Amazon United Kingdom?
- The niche generates £21K/yr across 7 tracked products. 90-day search growth is -41.3%. Flapen's verdict: Skip it (36/100).
- How competitive is the vitamin d test kit niche?
- 6 brands and 10 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 97% of demand.
- What do buyers complain about in vitamin d test kit?
- Top complaints mined from reviews: Accuracy-Overall, Vitamin, Instructions/User Manual/Troubleshooting. The return rate is 0.2%.
- When does demand for vitamin d test kit peak?
- Demand peaks in Jan–Feb–Mar; the busiest month runs 3.9× the quietest.
- What does it cost to enter the vitamin d test kit niche?
- Listings span £4.88–£8.48; the average listing price is £6.34 (sweet spot $15–$100). The average incumbent carries 186 reviews — the moat a new listing must climb.