---
title: "Adk — $669K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/adk"
last_updated: "2026-08-06T04:42:34.892Z"
locale: en
meta:
description: "Niche score 55/100 · $669K/yr market · 166K searches/yr · $32.01 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $669K/yr market · 166K searches/yr · $32.01 avg price. Strong incumbent ratings (4.7★) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Adk — $669K/yr Amazon US Niche (2026) - Flapen"
---
# **adk**
**Worth a look**
Shows low returns (0.0%), but strong incumbent ratings (4.7★) keeps it on the watch list.
Market size 67Growth 22Conversion 95Competition 27Returns 100Price range 91Avg price 95Brand share 35Review moat 68Quality gap 18
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.6%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$32.01**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$12.86–$59.16**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Good****764.06**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$669K**
$669K/yr · 166K searches
**Brand share**
**Okay****84%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-5.2%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, adk is a $669K/yr Amazon United States market (166K searches/yr). The top 5 brands hold 84% of demand. Verdict: Worth a look — 55/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **adk market data**
- **Units sold / yr**
- **20K–25K**
- avg 1,000–1,250/product
- **Revenue / yr**
- **$640K–$800K**
- units × avg price
- **Conversion rate**
- **12.6%**
- **Avg BSR**
- **#237**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **73 months**
- **Avg seller age**
- **154 days**
## **Competition & brand share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **▼falling
**Sellers**
**21**
**Top-5 brand share**
**84%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**11%**
- NatureGenX28% - Biote24% - Codeage13% - DAVINCI13% - Vitamatic6% - Designs for Health4% - Open — no brand owns it (5 brands, 11%)
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — -5.2% search growth over the last 90 days.
5K3KSpike '25Spike '26 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/adk/trend)
## **Top adk search terms**
- **adk**39K/yr+8.6%13.6% conv. - **adk vitamin supplement**41K/yr-28.9%11.1% conv. - **vitamin adk**23K/yr-0.5%8.7% conv. - **biote adk 5**10K/yr+8.3%21.6% conv. - **adk 5**8K/yr+17.4%16.9% conv. - **vitamin a d k**7K/yr-5.2%7.8% conv. - **a d k vitamin supplement**5K/yr+14.8%8.6% conv. - **adk supplement**4K/yr+24.9%7.1% conv. - **adk vitamins**4K/yr+7.3%9.6% conv. - **davinci laboratories**4K/yr-15.0%1.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/adk/search-terms)
## **Top adk 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.
0%10%$67K20%$134K30%$201K40%$268K1001K10K 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**NatureGenX ADK Vitamin Supplement Vitamins A D3 & K2 MK-7 for Bone Health & Calcium Absorption Gluten-Free Non-GMO Soy-Free 60 Capsules (2-Month Supply)**NatureGenX**$21.40**4.8★1,285 rev](https://www.amazon.com/dp/B076CRH6G6) [2**Biote Nutraceuticals - ADK 5 - Immunity + Cardiovascular (90 Capsules)**Biote**$48.77**4.9★657 rev](https://www.amazon.com/dp/B08RR3QLRQ) [3**Codeage ADK Vitamins Supplement - Essential Vitamin A D3 5000 IU K1 & K2 (MK4 & MK7) - 6-Month Supply - 1 Capsule per Serving Non-GMO Gluten-Free - 180 Capsules**Codeage**$40.54**4.7★2,201 rev](https://www.amazon.com/dp/B07HCQH4WC) [4**Biote Nutraceuticals - ADK 10 - Immunity + Cardiovascular (90 Capsules)**Biote**$48.81**4.8★1,660 rev](https://www.amazon.com/dp/B08RQYL21Z) [5**DAVINCI Labs ADK - Helps Support Bone Heart & Immune Health - Dietary Supplement with Vitamins A D3 & K2 (as MK-7) - Vegetarian Gluten Free & Soy Free - 60 Capsules**DAVINCI**$37.21**4.7★1,221 rev](https://www.amazon.com/dp/B00GSN6BVA)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Vitamatic ADK Vitamin Supplement 180 Veg Capsules High Potency Vitamins A D3 K2 for Bone Health Calcium Absorption Non-GMO Gluten Free**Vitamatic**$19.41**265 rev1y ago](https://www.amazon.com/dp/B0DBH789VQ) [**High Absorption ADK Vitamin Supplement - Vegan Vitamin D3 K2 MK7 & A for Calcium Regulation plus Bone Heart Thyroid & Immune Support - Vitamin ADK with 5000IU D3 Non GMO & Gluten Free (2 Months)**NEXGEN BLENDS**$19.38**214 rev1y ago](https://www.amazon.com/dp/B0DBJ37M2G) [**Natures Truth Vitamin ADK | 60 Softgels**Nature's Truth**$12.86**266 rev3y ago](https://www.amazon.com/dp/B0BXFTT9JS) [**DAVINCI Labs ADK - Helps Support Bone Heart & Immune Health - Dietary Supplement with Vitamins A D3 & K2 (as MK-7) - Vegetarian Gluten Free & Soy Free - 30 Capsules**DAVINCI**$19.78**1,221 rev3y ago](https://www.amazon.com/dp/B0BRBR2QFZ) [**ADK 5 Vitamin Supplement with Olive Oil Once Daily 90 Liquid Capsules**ALPHA RISE**$25.01**108 rev4y ago](https://www.amazon.com/dp/B09YCYQ1ZJ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**DAVINCI Labs ADK - Helps Support Bone Heart & Immune Health - Dietary Supplement with Vitamins A D3 & K2 (as MK-7) - Vegetarian Gluten Free & Soy Free - 30 Capsules**DAVINCI**$19.78**4.7★**▲ 96%**](https://www.amazon.com/dp/B0BRBR2QFZ) [**NatureGenX ADK Vitamin Supplement Vitamins A D3 & K2 MK-7 for Bone Health & Calcium Absorption Gluten-Free Non-GMO Soy-Free 120 Capsules 2-Pack (4-Month Supply)**NatureGenX**$39.04**4.8★**▲ 58%**](https://www.amazon.com/dp/B08SJ1LKQS) [**DAVINCI Labs ADK 10 - Helps Support Bone Heart & Immune Health - Dietary Supplement with Vitamins A D3 & K2 (as MK-7) - Vegetarian Gluten Free & Soy Free - 90 Capsules**DAVINCI**$59.16**4.7★**▲ 56%**](https://www.amazon.com/dp/B07QCLKX81) [**Biote Nutraceuticals - ADK 5 - Immunity + Cardiovascular (90 Capsules)**Biote**$48.77**4.9★**▲ 14%**](https://www.amazon.com/dp/B08RR3QLRQ) [**Vitamatic ADK Vitamin Supplement 180 Veg Capsules High Potency Vitamins A D3 K2 for Bone Health Calcium Absorption Non-GMO Gluten Free**Vitamatic**$19.41**4.7★**▲ 12%**](https://www.amazon.com/dp/B0DBH789VQ)
**~~View all trending →~~**
## **What buyers say about adk**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**24%
*“This brand is wonderful and well tolerated”*
**Vitamin**22%
*“This is by far the best vitamin supplement Ive ever used”*
**Value For Money**7%
*“Worth the money”*
**Advertised Vs Actual Product**5%
*“Does what it has to do”*
**Dosage**4%
*“My levels are always great”*
**Efficiency**4%
*“Works great”*
**Ease Of Chewing/Swallowing**4%
*“Easy to swallow”*
**Immunity Booster**3%
*“Great for my immune system”*
**Durability**3%
*“Solid and dependable”*
**Accuracy-Overall**2%
*“Timely”*
### **What buyers complain about **
**Smell**11%
*“recent bottles smell absolutely terrible”*
**Dosage**7%
*“do not take them”*
**Adhesion/Stickiness**7%
*“sticks together hard to shake one loose”*
**Ease Of Use**5%
*“those can be a hassle”*
**Size-Overall**4%
*“They are small”*
**Color Fading/Discoloration**4%
*“Some were discolored”*
**Taste-Overall**4%
*“they dont have an taste”*
**Value For Money**4%
*“It's expensive for only a 90-day supply”*
**Vitamin**3%
*“But I have to stopped using it due to the fact that the amount of vitamin D is too high”*
**Nutritional Content**3%
*“If youre taking them on an empty stomach youre wasting good money”*
### **Top return reasons **
**Dosage**100%
## **Common questions**
- **Is adk profitable to sell on Amazon United States?**
- The niche generates $669K/yr across 16 tracked products. 90-day search growth is -5.2%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the adk niche?**
- 11 brands and 21 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 84% of demand.
- **What do buyers complain about in adk?**
- Top complaints mined from reviews: Smell, Dosage, Adhesion/Stickiness. The return rate is 0.0%.
- **When does demand for adk peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the adk niche?**
- Listings span $12.86–$59.16; the average listing price is $32.01 (sweet spot $15–$100). The average incumbent carries 764 reviews — the moat a new listing must climb.
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