---
title: "Mk4 — $22K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/mk4"
last_updated: "2026-08-12T15:40:25.876Z"
locale: en
meta:
description: "Amazon product research for mk4: $22K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for mk4: $22K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Mk4 — $22K/mo Amazon US Product Research (2026)"
---
# **Mk4**
**Worth a look**
Shows low returns (0.1%), but strong incumbent ratings (4.6★) keeps it on the watch list.
Market size 48Growth 25Conversion 85Competition 25Returns 100Price range 88Avg price 95Brand share 41Review moat 40Quality gap 23
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$31.62**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.70–$73.59**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****9.4%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Okay****$262K**
$262K/yr · 88K searches
**Brand share**
**Okay****80%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****2,452.38**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Okay****+0.4%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****70%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
## **Is mk4 profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, mk4 is a $262K/yr Amazon United States market (88K searches/yr). The top 5 brands hold 80% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 29, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **mk4 market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **8K–10K**
- avg 500–750/product
- **Revenue / yr**
- **$253K–$316K**
- units × avg price
- **Conversion rate**
- **9.4%**
- **Avg BSR**
- **#483**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **74 months**
- **Avg seller age**
- **158 days**
## **Competition: brands, sellers & click share**
The top 5 products capture 70% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**13 **▼falling
**Sellers**
**42**
**Top-5 brand share**
**80%**
Top 20: 100%
**Top-5 click share**
**70%**
Top 20: 100%
**Open market**
**16%**
- Life Extension52% - Nutricost11% - Carlson7% - THORNE5% - NOW Foods5% - InnovixLabs4% - Open — no brand owns it (7 brands, 16%)
## **mk4 demand & seasonality**
Weekly Amazon search volume, last 102 weeks — +0.4% search growth over the last 90 days.
2K2KHoliday '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/health-household/mk4/trend)
## **Top mk4 search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **mk4**19K/yr+3.2%3.5% conv. - **vitamin k2 mk4**16K/yr-8.1%6.2% conv. - **k2 mk4**11K/yr+22.0%5.8% conv. - **life extension k2**11K/yr-2.6%13.9% conv. - **mk4 vitamin k2**6K/yr+11.9%4.5% conv. - **life extension vitamin k2**5K/yr+1.0%20.2% conv. - **life extension mega k2**4K/yr+23.8%17.7% conv. - **mk-4**4K/yr-1.9%3.5% conv. - **life extension k2 mk7**3K/yr-24.2%10.8% conv. - **mega k2**3K/yr-22.4%12.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/mk4/search-terms)
## **Top mk4 products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$26K20%$52K30%$79K40%$105K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**$25.46**4.7★812 rev](https://www.amazon.com/dp/B08MR2D124) [2**Nutricost Vitamin K2 (MK4) 240 Capsules (100mcg) - Gluten Free and Non-GMO**Nutricost**$14.61**4.7★4,626 rev](https://www.amazon.com/dp/B07JMW6K4D) [3**Life Extension Super K Vitamin K Supplement 2000 Mcg Vitamin K and 1180 Mcg Vitamin K2 Heart Health Once-Daily 90 Softgels**Life Extension**$19.39**4.6★6,990 rev](https://www.amazon.com/dp/B07RL1J9BV) [4**Life Extension Low Dose Vitamin K2 Supports Arterial Health Non-GMO Gluten-Free 90 Softgels**Life Extension**$11.11**4.7★1,829 rev](https://www.amazon.com/dp/B001KSNDSM) [5**Carlson - Vitamin K2 MK-4 (Menatetrenone) Vitamin K Supplement Bone & Heart Health K2 Vitamin Soy-free 60 capsules**Carlson**$20.51**4.8★796 rev](https://www.amazon.com/dp/B001LF39V0)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**NBI Osteo-MK4 60 Capsules**NBI**$65.42**39 rev2y ago](https://www.amazon.com/dp/B0D96V7W8P) [**Super Vitamin K Complex (K2 MK7 + MK4 & K1) 360 Coconut Oil Softgles | Easily Absorbed K Vitamins Active Menaquinone Complex | Non-GMO**Micro Ingredients**$24.60**444 rev3y ago](https://www.amazon.com/dp/B0C9PNMGR3) [**Carlyle Vitamin K2 Supplement 100 mcg | K2 MK-4 | 240 Capsules**Carlyle**$10.00**1,269 rev3y ago](https://www.amazon.com/dp/B0C7S1ZRNT) [**TACNEX OC/Mace Spray Holster for Duty Belt Pepper Spray Pouch MK3 MK4 Canister Holder Nylon Carry Case w/Top Flap Copper Snap MOLLE Strap for Police Security LE (Tall Nylon Pouch MK-4 and Similar)**TACNEX**$13.79**292 rev3y ago](https://www.amazon.com/dp/B0BL6DWWKB) [**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**$25.46**812 rev5y ago](https://www.amazon.com/dp/B08MR2D124)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**AOR Peak K2 Vitamin K2 MK-4 90 Vegan Capsules 30-90 Day Supply Essential for Bone Structure**AOR**$43.21**4.6★**▲ 146%**](https://www.amazon.com/dp/B00457KVBM) [**TACNEX OC/Mace Spray Holster for Duty Belt Pepper Spray Pouch MK3 MK4 Canister Holder Nylon Carry Case w/Top Flap Copper Snap MOLLE Strap for Police Security LE (Tall Nylon Pouch MK-4 and Similar)**TACNEX**$13.79**4.2★**▲ 143%**](https://www.amazon.com/dp/B0BL6DWWKB) [**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**$73.59**4.4★**▲ 23%**](https://www.amazon.com/dp/B000FGWDTK) [**InnovixLabs Full Spectrum Vitamin K2-90 Softgels with 600 mcg of Trans Form MK7 and MK4 - Supports General Health and Bone Strength - Soy and Gluten Free K2 Vitamin Supplement**InnovixLabs**$26.23**4.7★**▲ 15%**](https://www.amazon.com/dp/B00T8NROWM) [**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**$25.46**4.7★**— 10%**](https://www.amazon.com/dp/B08MR2D124)
**~~View all trending →~~**
## **What reviews say buyers love and hate about mk4**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“Great Product, Fills a real need”*
**Vitamin**19%
*“Great Vitamins”*
**Value For Money**8%
*“Good value for money”*
**Ease Of Chewing/Swallowing**5%
*“Easy to swallow”*
**Calcium**5%
*“Totally satisfied taking this with my calcium”*
**Nutritional Content**4%
*“Well-dosed and easy to integrate into daily supplements”*
**Heart Health**4%
*“Very beneficial for heart health”*
**Joint Pain**3%
*“Good for bones”*
**Advertised Vs Actual Product**3%
*“As described”*
**Dosage**3%
*“Great supplement I use this every morning and the dosage and size is perfect”*
### **What buyers complain about **
**Dosage**13%
*“Low dose is harder to find”*
**Vitamin**9%
*“dangerous amount of Vitamin K. Now I am stuck with it since it cant be returned”*
**Size-Overall**8%
*“The pills are larger”*
**Value For Money**7%
*“Just a little more cost”*
**Quality-Overall**5%
*“Need better quality control”*
**Side Effects**4%
*“had a bad feeling round my chest when I took this it went away”*
**Regulates Digestion**4%
*“some find it causes digestive issues”*
**Allergies**3%
*“eventually lots of vomiting”*
**Advertised Vs Actual Product**3%
*“Extremely misleading here”*
**Ingredients-Overall**2%
*“this product formulation needs to be revised”*
### **Top return reasons **
**Size-Overall**74%
**Compatibility-Overall**13%
**Advertised Vs Actual Product**3%
**Functionality-Overall**2%
**Quality-Overall**1%
**Shape/Style**1%
**Dosage**1%
**Value For Money**1%
**Strength**1%
**Strap/String Quality**1%
## **Common mk4 questions**
- **Is mk4 profitable to sell on Amazon United States?**
- The niche generates $262K/yr across 16 tracked products. 90-day search growth is +0.4%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the mk4 niche?**
- 13 brands and 42 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 80% of demand.
- **What do buyers complain about in mk4?**
- Top complaints mined from reviews: Dosage, Vitamin, Size-Overall. The return rate is 0.1%.
- **When does demand for mk4 peak?**
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- **What does it cost to enter the mk4 niche?**
- Listings span $9.70–$73.59; the average listing price is $31.62 (sweet spot $15–$100). The average incumbent carries 2,452 reviews — the moat a new listing must climb.
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