vitamin k complex
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible13.6%search→purchase rate — share of searches ending in a sale
Avg price
Incredible$30.86avg listing price — sweet spot $15–$100
Price range
Great$9.92–$73.59cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$794K$794K/yr · 189K searches
Review moat
Okay3,137.22avg incumbent reviews — the moat a new listing must climb
Growth
Bad-0.3%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Competition
Bad90%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, vitamin k complex is a $794K/yr Amazon United States market (189K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 48/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
vitamin k complex market data
- Units sold / yr
- 30K–40K
- avg 3,000–4,000/product
- Revenue / yr
- $926K–$1.2M
- units × avg price
- Conversion rate
- 13.6%
- Avg BSR
- #143
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 100%
- Out of stock
- 0.0%
- Avg brand age
- 84 months
- Avg seller age
- 143 days
Competition & brand share
The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.Brands
5 flat
Sellers
17
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
90%
Top 20: 100%
Open market
0%
- Life Extension48%
- THORNE43%
- Bronson4%
- NatureBell3%
- Micro Ingredients2%
Demand
Weekly Amazon search volume, last 51 weeks — -0.3% search growth over the last 90 days.Top vitamin k complex search terms
- super k66K/yr
- thorne k219K/yr
- life extension super k18K/yr
- thorne vitamin k15K/yr
- vitamin k complex12K/yr
- superk10K/yr
- thorne vitamin k29K/yr
- vitamin c and k5K/yr
- vitamin k1 and k26K/yr
- super k life extension5K/yr
Top vitamin k complex 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 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Life Extension Super K Vitamin K Supplement 2000 Mcg Vitamin K and 1180 Mcg Vitamin K2 Heart Health Once-Daily 90 Softgels
Life Extension$19.394.6★6,990 rev
THORNE - Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bones* - Clinically Studied Ingredients - Third-Party Certified - Gluten Dairy & Soy-Free - 60 Capsules
THORNE$29.954.8★1,793 rev
Life Extension Super K 150 Softgels with Vitamin K1 and K2 - MK4 & MK7
Life Extension$37.744.8★1,155 rev
THORNE - Vitamin K2 - Concentrated Vitamin K2 (as MK-4) Liquid Supplement - Supports Bone Heart & and Blood Vessel Health* - Third-Party Certified - Gluten Dairy & Soy-Free - 1 Fl Oz
THORNE$73.594.4★498 rev
Bronson Vitamin K Triple Play (Vitamin K2 MK7 / Vitamin K2 MK4 / Vitamin K1) Full Spectrum Complex Vitamin K Supplement 90 Capsules
Bronson$9.924.7★8,555 rev
Newest
by launch date
Super Vitamin K Complex (K2 MK7 + MK4 & K1) 360 Coconut Oil Softgles | Easily Absorbed K Vitamins Active Menaquinone Complex | Non-GMO
Micro Ingredients$24.60444 rev
NatureBell Vitamin K Complex - 300 Softgels - Delivers 2 600mcg Vitamin K - Full Spectrum Bone & Heart Health Support Supplement - High Absorption K1 & K2 MK-4 & MK-7*
NatureBell$24.131,326 rev
Life Extension Mega Vitamin K2 High Potency for Strong Bones clinically Studied 45 mg K2 Dosage Promotes Healthy Bone Density Gluten-Free Non-GMO 30 Capsules
Life Extension$25.46812 rev
Life Extension Super K 150 Softgels with Vitamin K1 and K2 - MK4 & MK7
Life Extension$37.741,155 rev
Life Extension Super K Vitamin K Supplement 2000 Mcg Vitamin K and 1180 Mcg Vitamin K2 Heart Health Once-Daily 90 Softgels
Life Extension$19.396,990 rev
Trending
90-day click momentumBronson Vitamin K Triple Play (Vitamin K2 MK7 / Vitamin K2 MK4 / Vitamin K1) Full Spectrum Complex Vitamin K Supplement 90 Capsules
Bronson$9.924.7★
Life Extension Mega Vitamin K2 High Potency for Strong Bones clinically Studied 45 mg K2 Dosage Promotes Healthy Bone Density Gluten-Free Non-GMO 30 Capsules
Life Extension$25.464.7★
Life Extension Super K 150 Softgels with Vitamin K1 and K2 - MK4 & MK7
Life Extension$37.744.8★
THORNE - Vitamin K - Vitamins K1 and K2 (as MK-4 and MK-7) Capsule Supplement - Supports Strong Bones* - Clinically Studied Ingredients - Third-Party Certified - Gluten Dairy & Soy-Free - 60 Capsules
THORNE$29.954.8★
NatureBell Vitamin K Complex - 300 Softgels - Delivers 2 600mcg Vitamin K - Full Spectrum Bone & Heart Health Support Supplement - High Absorption K1 & K2 MK-4 & MK-7*
NatureBell$24.134.7★
What buyers say about vitamin k complex
What buyers praise and complain about, mined from review topics.What buyers love
“It is a good brand vitamin”
“Great Product, Fills a real need”
“Great value”
“The liquid form makes it easier to consume”
“Works Well”
“The dosage is a great balance”
“Excellent formulation combines Fat”
“Convenient”
“Seems to be as described”
“my blood test showed an improvement in my bad cholesterol”
What buyers complain about
“The dropper is very hard to use”
“Hard to dispense”
“dangerous amount of Vitamin K. Now I am stuck with it since it cant be returned”
“exact dosing is difficult”
“Doesn't taste like anything”
“Just a little more cost”
“There is side effects”
“Didn't work for me, no stars, unfortunately”
“it arrived all leaky”
“Need better quality control”
Top return reasons
Common questions
- Is vitamin k complex profitable to sell on Amazon United States?
- The niche generates $794K/yr across 9 tracked products. 90-day search growth is -0.3%. Flapen's verdict: Skip it (48/100).
- How competitive is the vitamin k complex niche?
- 5 brands and 17 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in vitamin k complex?
- Top complaints mined from reviews: Ease Of Use, Dispensing Mechanism, Vitamin. The return rate is 0.0%.
- What does it cost to enter the vitamin k complex niche?
- Listings span $9.92–$73.59; the average listing price is $30.86 (sweet spot $15–$100). The average incumbent carries 3,137 reviews — the moat a new listing must climb.