---
title: "Magnesium Oxide 500mg Capsules — Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-oxide-500mg-capsules"
last_updated: "2026-08-12T16:28:08.282Z"
locale: en
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description: "Amazon product research for magnesium oxide 500mg capsules: demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium oxide 500mg capsules: demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium Oxide 500mg Capsules — Amazon US Product Research"
---
# **Magnesium Oxide 500mg Capsules**
**Skip it**
A deep review moat (19,507 avg reviews) — this niche doesn't clear our bar today.
Market size 35Growth 31Conversion 97Competition 29Returns 100Price range 72Avg price 65Brand share 39Review moat 17Quality gap 24
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****15.6%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Good****$5.55–$39.16**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Good****$13.75**
avg listing price — sweet spot $15–$100
**Brand share**
**Okay****81%**
top-5 brand share — brands hold most of the demand
**Market size**
**Okay****$167K**
$167K/yr · 78K searches
**Growth**
**Okay****+5.0%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****19,506.89**
avg incumbent reviews — the moat a new listing must climb
## **Is magnesium oxide 500mg capsules profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium oxide 500mg capsules is a $167K/yr Amazon United States market (78K searches/yr). The top 5 brands hold 81% of demand. Verdict: Skip it — 48/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium oxide 500mg capsules market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **13K–15K**
- avg 750–1,000/product
- **Revenue / yr**
- **$172K–$206K**
- units × avg price
- **Conversion rate**
- **15.6%**
- **Avg BSR**
- **#477**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **83%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **73 months**
- **Avg seller age**
- **151 days**
## **Competition: brands, sellers & click share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▼falling
**Sellers**
**76**
**Top-5 brand share**
**81%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**14%**
- Nature's Bounty34% - Carlyle19% - Amazing Nutrition13% - Best Naturals11% - Nutricost5% - BulkSupplements5% - Open — no brand owns it (8 brands, 14%)
## **magnesium oxide 500mg capsules demand & seasonality**
Weekly Amazon search volume, last 101 weeks — +5.0% search growth over the last 90 days.
2K2KSpike '25 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.2×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-oxide-500mg-capsules/trend)
## **Top magnesium oxide 500mg capsules 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%$17K20%$33K30%$50K40%$67K101001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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★105,290 rev](https://www.amazon.com/dp/B00H5PJ0HW) [2**Carlyle Magnesium Oxide 500mg | 120 Capsules | Premium Quality**Carlyle**$6.39**4.6★683 rev](https://www.amazon.com/dp/B0CBSQ54GD) [3**Amazing Formulas Magnesium Oxide Supplement | 500 Mg per Serving | 90 Capsules | Non-GMO | Gluten-Free | Made in USA**Amazing Nutrition**$10.11**4.5★797 rev](https://www.amazon.com/dp/B01ELWXJ3C) [4**Natures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)**Nature's Bounty**$16.23**4.7★105,290 rev](https://www.amazon.com/dp/B08C65K2WC) [5**Best Naturals Magnesium Oxide 500mg 360 Tablets - 1 Year Supply - Magnesium for Immune Support Muscle Recovery Leg Cramps Relaxation**Best Naturals**$18.74**4.6★878 rev](https://www.amazon.com/dp/B0BBSK4VBN)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Natures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)**Nature's Bounty**$16.23**105,290 rev8mo ago](https://www.amazon.com/dp/B08C65K2WC) [**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) [**Carlyle Magnesium Oxide 500mg | 120 Capsules | Premium Quality**Carlyle**$6.39**683 rev3y ago](https://www.amazon.com/dp/B0CBSQ54GD) [**Amazing Formulas Magnesium Oxide Supplement 500 Mg per Serving Capsules Non-GMO Gluten-Free Made in USA 180 Capsules**Amazing Nutrition**$18.52**36 rev3y ago](https://www.amazon.com/dp/B0BPVBPWN3) [**BulkSupplements.com Magnesium Oxide Capsules - Magnesium Supplement Magnesium Oxide 500mg - Gluten Free 1 Capsule per Serving 180 Count (Pack of 1)**BulkSupplements**$16.26**182 rev3y ago](https://www.amazon.com/dp/B0BB8CXD6R)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Amazing Formulas Magnesium Oxide Supplement 500 Mg per Serving Capsules Non-GMO Gluten-Free Made in USA 180 Capsules**Amazing Nutrition**$18.52**4.8★**▲ 140%**](https://www.amazon.com/dp/B0BPVBPWN3) [**Magnesium Oxide 400mg 500 Capsules | Elemental Form for Max Concentration | Supports Calm Muscle & Nerve Health | Non-GMO**Micro Ingredients**$17.52**4.6★**▲ 50%**](https://www.amazon.com/dp/B0DDWD83GF) [**Best Naturals Magnesium Oxide 500mg 360 Tablets - 1 Year Supply - Magnesium for Immune Support Muscle Recovery Leg Cramps Relaxation**Best Naturals**$18.74**4.6★**▲ 42%**](https://www.amazon.com/dp/B0BBSK4VBN) [**Douglas Laboratories Magnesium Oxide | Supports Normal Heart Function and Bone Formation* | 250 Capsules**Douglas Laboratories**$20.50**4.5★**▲ 31%**](https://www.amazon.com/dp/B07L6PFS17) [**nbpure MagO7 Natural Colon Cleanse & Detox (180 Capsules)**nbpure**$39.16**4.6★**▲ 12%**](https://www.amazon.com/dp/B00028OVXM)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium oxide 500mg capsules**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**19%
*“Excellent product and now available on Amazon”*
**Value For Money**11%
*“Great deal”*
**Magnesium**9%
*“These magnesium pills are perfect”*
**Efficiency**8%
*“Works beautifully”*
**Advertised Vs Actual Product**6%
*“As described”*
**Regulates Digestion**6%
*“Constipation relief”*
**Sleep Quality**6%
*“restful sleep”*
**Vitamin**4%
*“Good daily vitamin”*
**Muscle Pain Relief**3%
*“less muscle aches, tightness”*
**Acid Regulator/Stomach Ache Relief**2%
*“doesn't hurt my tummy”*
### **What buyers complain about **
**Magnesium**11%
*“Magnesium deficiency”*
**Functionality-Overall**7%
*“Works great, nothing helps me”*
**Dosage**7%
*“I cant be sure that the dosage Im receiving is correct”*
**Regulates Digestion**6%
*“have struggled with constipation”*
**Size-Overall**5%
*“Too large”*
**Side Effects**5%
*“cramping or bloating”*
**Value For Money**4%
*“Overpriced”*
**Ease Of Chewing/Swallowing**4%
*“I have swallowing issues”*
**Acid Regulator/Stomach Ache Relief**4%
*“Hard on my stomach”*
**Sleep Quality**3%
*“Definitely get tired after about a half hour”*
### **Top return reasons **
**Magnesium**49%
**Dosage**14%
**Charging**7%
**Ease Of Chewing/Swallowing**5%
**Advertised Vs Actual Product**5%
**Functionality-Overall**5%
**Value For Money**5%
**Ingredients-Overall**2%
**Sleep Quality**2%
**Regulates Digestion**2%
## **Common magnesium oxide 500mg capsules questions**
- **Is magnesium oxide 500mg capsules profitable to sell on Amazon United States?**
- The niche generates $167K/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +5.0%. Flapen's verdict: Skip it (48/100).
- **How competitive is the magnesium oxide 500mg capsules niche?**
- 14 brands and 76 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 81% of demand.
- **What do buyers complain about in magnesium oxide 500mg capsules?**
- Top complaints mined from reviews: Magnesium, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for magnesium oxide 500mg capsules peak?**
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- **What does it cost to enter the magnesium oxide 500mg capsules niche?**
- Listings span $5.55–$39.16; the average listing price is $13.75 (sweet spot $15–$100). The average incumbent carries 19,507 reviews — the moat a new listing must climb.
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