zynex
Skip itPrices mostly outside the sweet spot ($7.09–$2404.12) — this niche doesn't clear our bar today.
Market size
Good$811K$811K/yr · 75K searches
Conversion
Good5.4%search→purchase rate — share of searches ending in a sale
Returns
Good2.9%return rate — above 5% kills the launch gate
Brand share
Good74%top-5 brand share — brands hold most of the demand
Avg price
Okay$202.54avg listing price — sweet spot $15–$100
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Competition
Okay67%top-5 click share — leaders hold, buyers still browse
Growth
Okay+0.9%90-day search growth — must beat 0% to launch
Review moat
Bad11,816.21avg incumbent reviews — the moat a new listing must climb
Price range
Bad$7.09–$2404.12cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United States niche tracking, zynex is a $811K/yr Amazon United States market (75K searches/yr). The top 5 brands hold 74% of demand. Verdict: Skip it — 43/100.
Data updated Jul 10, 2026 · scored weekly · How we score niches
zynex market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $608K–$810K
- units × avg price
- Conversion rate
- 5.4%
- Avg BSR
- #439
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 95%
- Out of stock
- 3.1%
- Avg brand age
- 55 months
- Avg seller age
- 178 days
Competition & brand share
The top 5 products take 67% of clicks — established leaders, but buyers still shop beyond them.Brands
16 rising
Sellers
33
Top-5 brand share
74%
Top 20: 100%
Top-5 click share
67%
Top 20: 100%
Open market
23%
- Boiron44%
- Balego14%
- NeuroMD6%
- AUVON5%
- Belifu5%
- PerVita Medical4%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +0.9% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Top zynex search terms
- nmes machine16K/yr
- bone stimulator for bone healing20K/yr
- bone stimulator17K/yr
- symphytum officinale 30c9K/yr
- gimnasia pasiva corporal profesional7K/yr
- full body ems muscle stimulator4K/yr
- symphytum 30c2K/yr
Top zynex 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 19 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Boiron Symphytum Officinale 30C Homeopathic Medicine for Bone Trauma - 80 Pellets
Boiron$7.094.6★896 rev
Boiron Symphytum Officinale 30c Homeopathic Medicine That Promotes Healing of Bone Trauma - Pack of 3 (240 Pellets)
Boiron$19.484.6★896 rev
Balego EMS Digital Neuromuscular NMES Stimulator OTC
Balego$61.694.4★2,263 rev
NeuroMD NMES Wireless Muscle Stimulator Portable Device for Temporary Relief of Pain Due to Sore/Aching Muscles Model SM9113
NeuroMD$148.274.2★245 rev
PerVita Medical Extracorporeal Shock Wave Therapy ESWT Machine for Joint and Muscle Pain Relief Muscle and Bone Tissue Regeneration Painless Non-Invasive No Side Effects PSP20
PerVita Medical$2404.124.8★155 rev
Newest
by launch date
Motive Lower Back FDA-Cleared NMES Therapy: Strengthen Lower Back Muscles for Better Stability & Movement Support 20-Min At-Home Sessions Drug Free
Motive$193.3129 rev
NeuroMD NMES Wireless Muscle Stimulator Portable Device for Temporary Relief of Pain Due to Sore/Aching Muscles Model SM9113
NeuroMD$148.27245 rev
Dancespot EMS Foot Massager for Neuropathy NMES Foot Stimulator for Neuropathy Feet Nerve FSA Eligible Electric Foot Massager for Circulation and Pain Relief with 4 TENS Unit Muscle Stimulator Pads
Dancespot$85.32139 rev
Shockwave Therapy Machine Portable Extracorporeal Shock Wave Therapy Machine for Joint and Muscle Pain Relief Muscle and Bone Tissue Regeneration Painless Non-Invasive No Side Effects
DHASUWT$517.526 rev
TENS EMS Unit Muscle Stimulator for Pain Relief Therapy - 4 in 1 TENS EMS Relax Custom Frequency+Pulse - Muscle Massager 36 Modes 20 Intensity Memory & Favorites Function 3.8 Color Display - Gray
Belifu$53.761,731 rev
Trending
90-day click momentum
Air Barrel - Air Roller Gymnastics Barrel for Back Handspring Trainer Air Tumble Mat with Pump for Gym Training/Yoga Balance Exercise/Cheerleading/Home and Outdoor Use
NBSPORT$53.314.7★
Xensamy Yoga Strap with 12 Loops - Multi-Functional Stretch Band for Pilates Dance Gymnastics Physical Therapy Flexibility & Resistance Training Ballet Latin Workouts
Xensamy$9.784.8★
Motive Lower Back FDA-Cleared NMES Therapy: Strengthen Lower Back Muscles for Better Stability & Movement Support 20-Min At-Home Sessions Drug Free
Motive$193.314.2★
Metagenics Bone Builder Extra Strength - Microcrystalline Hydroxyapatite Concentrate (MCHC) with Calcium & Phosphorus - Supports Bone Density & Strength - Non-GMO & Gluten-Free - 90 Tablets
Metagenics$38.584.7★
AUVON 3-in-1 TENS Unit Muscle Stimulator EMS Massage Machine with 40 Intensities for Gradual Shoulder Sciatica Back Pain Relief 24 Modes Rechargeable Electronic Pulse Massager with 12 TENS Pads
AUVON$29.314.6★
What buyers say about zynex
What buyers praise and complain about, mined from review topics.What buyers love
“So far it has been effective”
“Decent quality”
“Easy to move”
“Great Value”
“Helps with muscle pain”
“Battery lasts forever”
“As advertised”
“Charges very quickly”
“Helped reduce knee pain”
“Great power”
What buyers complain about
“Never worked”
“Didn't last”
“Does not stick well”
“battery life is very short”
“Back pain”
“Stopped charging”
“Terrible quality and just useless”
“Product instructions not clear”
“the ones I ordered dont fit”
“Not worth it”
Top return reasons
Common questions
- Is zynex profitable to sell on Amazon United States?
- The niche generates $811K/yr across 19 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is +0.9%. Flapen's verdict: Skip it (43/100).
- How competitive is the zynex niche?
- 16 brands and 33 sellers compete. The top 5 products take 67% of clicks and top 5 brands hold 74% of demand.
- What do buyers complain about in zynex?
- Top complaints mined from reviews: Functionality-Overall, Durability, Adhesion/Stickiness. The return rate is 2.9%.
- When does demand for zynex peak?
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- What does it cost to enter the zynex niche?
- Listings span $7.09–$2404.12; the average listing price is $202.54 (sweet spot $15–$100). The average incumbent carries 11,816 reviews — the moat a new listing must climb.