---
title: "Magnesium Oxide — $168K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-oxide"
last_updated: "2026-08-13T18:50:47.132Z"
locale: en
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description: "Amazon product research for magnesium oxide: $168K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium oxide: $168K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium Oxide — $168K/mo Amazon US Product Research (2026)"
---
# **Magnesium Oxide**
**Launch it**
A $2.0M/yr market growing +3.4% this quarter with returns at 0.0% — clears our launch bar.
Market size 95Growth 29Conversion 97Competition 33Returns 100Price range 73Avg price 69Brand share 34Review moat 14Quality gap 22
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****14.8%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Incredible****$2.0M**
$2.0M/yr · 951K searches
**Price range**
**Good****$6.19–$39.16**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$14.31**
avg listing price — sweet spot $15–$100
**Brand share**
**Okay****85%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+3.4%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****24,598.46**
avg incumbent reviews — the moat a new listing must climb
## **Is magnesium oxide profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium oxide is a $2.0M/yr Amazon United States market (951K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in Jan. Verdict: Launch it — 57/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium oxide market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **125K–150K**
- avg 8,000–10,000/product
- **Revenue / yr**
- **$1.8M–$2.1M**
- units × avg price
- **Conversion rate**
- **14.8%**
- **Avg BSR**
- **#205**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **69%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **78 months**
- **Avg seller age**
- **151 days**
## **Competition: brands, sellers & click share**
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**9 **▼falling
**Sellers**
**102**
**Top-5 brand share**
**85%**
Top 20: 100%
**Top-5 click share**
**65%**
Top 20: 100%
**Open market**
**10%**
- P Puregen Labs42% - Nature Made21% - Mag-Ox 40011% - RUGBY LABORATORIES6% - Micro Ingredients5% - Nutricost5% - Open — no brand owns it (3 brands, 10%)
## **magnesium oxide demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +3.4% search growth over the last 90 days.
30K20KPrime Day '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-oxide/trend)
## **Top magnesium oxide search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **magnesium oxide**489K/yr-2.4%8.9% conv. - **magnesium oxide 400mg**268K/yr+4.3%17.0% conv. - **mag oxide 400 mg**27K/yr+27.5%15.1% conv. - **magnesium oxide 400 mg**22K/yr+33.2%10.0% conv. - **magnesium oxide 400+mg**19K/yr+13.8%12.5% conv. - **magox 400 magnesium 120 tablets**18K/yr+43.5%20.2% conv. - **oxido de magnesio**17K/yr-15.0%2.0% conv. - **magnesium -oxide**10K/yr+19.0%1.9% conv. - **magnesium oxide 400mg tablets**10K/yr+9.0%5.9% conv. - **mag oxide**10K/yr+14.2%8.1% conv. [**All search terms **](https://flapen.com/research/us/health-household/magnesium-oxide/search-terms)
## **Top magnesium oxide 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%$202K20%$403K30%$605K40%$806K1001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 13 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1![Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets](https://m.media-amazon.com/images/I/41A9+SJ9rLL.jpg)**Magnesium 400mg \[High Potency\] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets**P Puregen Labs**$8.72**4.6★8,231 rev](https://www.amazon.com/dp/B08SJV83TX) [2**Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels**Nature Made**$10.07**4.7★44,839 rev](https://www.amazon.com/dp/B002RS6PN4) [3**Nature Made Magnesium Oxide Extra Strength 400 mg 110 Softgels**Nature Made**$11.32**4.7★44,839 rev](https://www.amazon.com/dp/B07CDWT8WM) [4**Mag-Ox High Potency Magnesium Supplement Tablets 120 Count Pack of 2**Mag-Ox 400**$20.51**4.7★9,875 rev](https://www.amazon.com/dp/B08871J5MN) [5**Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (1 Pack)**RUGBY LABORATORIES**$6.19**4.6★1,336 rev](https://www.amazon.com/dp/B08CK3RPK1)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Magnesium Oxide 400mg 400 Capsules | High Purity Elemental Form Extra Strength Essential Mineral Supplements for Muscle Digestion Bone & Heart Support Non-GMO & No Gluten**NatureBell**$12.91**299 rev1y ago](https://www.amazon.com/dp/B0F11PGHN9) [**Magnesium Oxide 400mg 500 Capsules | Elemental Form for Max Concentration | Supports Calm Muscle & Nerve Health | Non-GMO**Micro Ingredients**$17.52**754 rev1y ago](https://www.amazon.com/dp/B0DDWD83GF) [**Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (1 Pack)**RUGBY LABORATORIES**$6.19**1,336 rev4y ago](https://www.amazon.com/dp/B08CK3RPK1) [![Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps Relaxation - 3 Pack | Total 360 Count](https://m.media-amazon.com/images/I/51CE4Xk3SjL.jpg)**Magnesium 400mg \[High Potency\] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps Relaxation - 3 Pack | Total 360 Count**P Puregen Labs**$18.73**8,231 rev4y ago](https://www.amazon.com/dp/B09M923WY7) [![Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets](https://m.media-amazon.com/images/I/41A9+SJ9rLL.jpg)**Magnesium 400mg \[High Potency\] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets**P Puregen Labs**$8.72**8,231 rev5y ago](https://www.amazon.com/dp/B08SJV83TX)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels**Nature Made**$10.07**4.7★**▲ 92%**](https://www.amazon.com/dp/B002RS6PN4) [**Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (1 Pack)**RUGBY LABORATORIES**$6.19**4.6★**▲ 16%**](https://www.amazon.com/dp/B08CK3RPK1) [**Magnesium Oxide 400mg 400 Capsules | High Purity Elemental Form Extra Strength Essential Mineral Supplements for Muscle Digestion Bone & Heart Support Non-GMO & No Gluten**NatureBell**$12.91**4.7★**▲ 14%**](https://www.amazon.com/dp/B0F11PGHN9) [**Natures Bounty Magnesium 500 mg Tablets High Potency Magnesium Supplement for Bone & Muscle Health Whole Body Support 200 Count (Pack of 1)**Nature's Bounty**$8.74**4.7★**▲ 13%**](https://www.amazon.com/dp/B00H5PJ0HW) [**Mag-Ox Magnesium Supplement Pharmaceutical Grade Magnesium Oxide 483mg Most Concentrated Form of Magnesium 120 Tablets**Mag-Ox 400**$10.55**4.7★**▲ 13%**](https://www.amazon.com/dp/B004CXBLAO)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium oxide**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“Good quality and reliable brand”*
**Efficiency**10%
*“Effective”*
**Value For Money**9%
*“Great deal”*
**Magnesium**9%
*“Best magnesium supplement I have found”*
**Advertised Vs Actual Product**7%
*“As described”*
**Regulates Digestion**7%
*“Constipation relief”*
**Sleep Quality**5%
*“Helps me sleep”*
**Vitamin**3%
*“Good daily vitamin”*
**Acid Regulator/Stomach Ache Relief**3%
*“Helped My Son with Stomach Issues”*
**Muscle Pain Relief**2%
*“help me a lot relaxing my muscles”*
### **What buyers complain about **
**Functionality-Overall**10%
*“I hardly work”*
**Magnesium**9%
*“I got the wrong magnesium”*
**Dosage**8%
*“Dose is too high for me”*
**Regulates Digestion**7%
*“will actually cause major digestive issues”*
**Acid Regulator/Stomach Ache Relief**5%
*“Hard on my stomach”*
**Side Effects**5%
*“Not worth the side effects”*
**Size-Overall**4%
*“Too large”*
**Sleep Quality**3%
*“I can not sleep properly”*
**Value For Money**3%
*“Not worth it”*
**Ease Of Chewing/Swallowing**3%
*“I have swallowing issues”*
### **Top return reasons **
**Magnesium**51%
**Dosage**14%
**Charging**6%
**Ease Of Chewing/Swallowing**4%
**Value For Money**4%
**Functionality-Overall**4%
**Advertised Vs Actual Product**2%
**Regulates Digestion**2%
**Size-Overall**2%
**Sleep Quality**2%
## **Common magnesium oxide questions**
- **Is magnesium oxide profitable to sell on Amazon United States?**
- The niche generates $2.0M/yr across 13 tracked products. 90-day search growth is +3.4%. Flapen's verdict: Launch it (57/100).
- **How competitive is the magnesium oxide niche?**
- 9 brands and 102 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 85% of demand.
- **What do buyers complain about in magnesium oxide?**
- Top complaints mined from reviews: Functionality-Overall, Magnesium, Dosage. The return rate is 0.0%.
- **When does demand for magnesium oxide peak?**
- Demand peaks in Jan; the busiest month runs 1.4× the quietest.
- **What does it cost to enter the magnesium oxide niche?**
- Listings span $6.19–$39.16; the average listing price is $14.31 (sweet spot $15–$100). The average incumbent carries 24,598 reviews — the moat a new listing must climb.
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