---
title: "Magnesium 400 Mg — $106K/mo Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-400-mg"
last_updated: "2026-08-12T15:18:45.223Z"
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description: "Amazon product research for magnesium 400 mg: $106K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium 400 mg: $106K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium 400 Mg — $106K/mo Amazon US Product Research"
---
# **Magnesium 400 Mg**
**Skip it**
Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Market size 82Growth 19Conversion 96Competition 25Returns 100Price range 70Avg price 76Brand share 6Review moat 14Quality gap 23
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****14.1%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Great****$1.3M**
$1.3M/yr · 584K searches
**Avg price**
**Great****$15.39**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$4.10–$40.09**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Okay****70%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-12.6%**
90-day search growth — must beat 0% to launch
**Review moat**
**Bad****24,674.24**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Bad****98%**
top-5 brand share — brand-locked demand
## **Is magnesium 400 mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium 400 mg is a $1.3M/yr Amazon United States market (584K searches/yr). The top 5 brands hold 98% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 49/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium 400 mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **80K–100K**
- avg 6,000–8,000/product
- **Revenue / yr**
- **$1.2M–$1.5M**
- units × avg price
- **Conversion rate**
- **14.1%**
- **Avg BSR**
- **#237**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **67%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **64 months**
- **Avg seller age**
- **146 days**
## **Competition: brands, sellers & click share**
The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**7 **▲rising
**Sellers**
**176**
**Top-5 brand share**
**98%**
Top 20: 100%
**Top-5 click share**
**70%**
Top 20: 99%
**Open market**
**1%**
- Nature Made81% - Nature's Bounty8% - Amazon Basics6% - Qunol2% - NOW Foods2% - Double Wood Supplements1% - Open — no brand owns it (1 brand, 1%)
## **magnesium 400 mg demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -12.6% search growth over the last 90 days.
30K20KSpike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
Peak months: Aug, Sep · busiest ÷ quietest = 3.0×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-400-mg/trend)
## **Top magnesium 400 mg search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **magnesium 400 mg**102K/yr-5.0%13.9% conv. - **nature made magnesium**158K/yr-20.4%14.7% conv. - **magnesium nature made**43K/yr-2.1%14.8% conv. - **magnesium 400mg**93K/yr-62.0%9.7% conv. - **magnesium 400**28K/yr-4.1%8.5% conv. - **magnesium extra strength 400 mg**21K/yr+19.0%14.4% conv. - **400 mg magnesium**16K/yr+30.9%6.7% conv. - **magnesium extra strength**14K/yr+18.4%5.1% conv. - **magnesium 400 mg nature made**11K/yr-3.2%20.8% conv. - **magnesium 400mg softgels**11K/yr+20.8%8.8% conv. [**All search terms **](https://flapen.com/research/us/health-household/magnesium-400-mg/search-terms)
## **Top magnesium 400 mg 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%$127K20%$255K30%$382K40%$509K101001K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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) [2**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) [3**Nature Made Magnesium Oxide 250 mg for Muscle Relaxation 200 Tablets**Nature Made**$6.80**4.7★34,776 rev](https://www.amazon.com/dp/B0002VG3QC) [4**Nature Made Magnesium Glycinate 300 mg per 3 Capsules 90 Capsules**Nature Made**$21.13**4.7★2,683 rev](https://www.amazon.com/dp/B0D9MV3YJQ) [5**Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count**Amazon Basics**$13.70**4.6★98 rev](https://www.amazon.com/dp/B0FG7N1LLK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets**Nature Made**$13.29**75 rev5mo ago](https://www.amazon.com/dp/B0GN5891HN) [**Nature Made Magnesium + Ashwagandha Capsules 60 Capsules**Nature Made**$11.06**107 rev5mo ago](https://www.amazon.com/dp/B0GN4WDMQ4) [**Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count**Amazon Basics**$13.70**98 rev5mo ago](https://www.amazon.com/dp/B0FG7N1LLK) [**Nature Made Extra Strength Magnesium 400 mg. 180 Softgelsm Bundle with a Pill Oragnizer (2 Items)**Nature Made**$27.95**38 rev8mo ago](https://www.amazon.com/dp/B0G1XV795S) [**Nature Made Magnesium Glycinate 300 mg per 3 Capsules 90 Capsules**Nature Made**$21.13**2,683 rev1y ago](https://www.amazon.com/dp/B0D9MV3YJQ)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets**Nature Made**$13.29**4.4★**▲ 300%**](https://www.amazon.com/dp/B0GN5891HN) [**Nature Made Magnesium + Ashwagandha Capsules 60 Capsules**Nature Made**$11.06**4.3★**▲ 295%**](https://www.amazon.com/dp/B0GN4WDMQ4) [**Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count**Amazon Basics**$13.70**4.6★**▲ 205%**](https://www.amazon.com/dp/B0FG7N1LLK) [**Nature Made Extra Strength Magnesium 400 mg. 180 Softgelsm Bundle with a Pill Oragnizer (2 Items)**Nature Made**$27.95**4.5★**▲ 90%**](https://www.amazon.com/dp/B0G1XV795S) [**Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels**Nature Made**$10.07**4.7★**▲ 83%**](https://www.amazon.com/dp/B002RS6PN4)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium 400 mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“The quality is solid”*
**Sleep Quality**17%
*“Helps me sleep”*
**Magnesium**12%
*“Great magnesium tablets”*
**Value For Money**10%
*“They are affordable”*
**Advertised Vs Actual Product**5%
*“arrived as described”*
**Vitamin**4%
*“Good daily vitamin”*
**Muscle Pain Relief**3%
*“Relaxs my tight muscles”*
**Efficiency**3%
*“Good works as intended”*
**Ease Of Chewing/Swallowing**2%
*“Easier to swallow”*
**Dosage**2%
*“Perfect dosage per capsule”*
### **What buyers complain about **
**Magnesium**15%
*“Too much magnesium”*
**Size-Overall**8%
*“Capsules too large”*
**Dosage**8%
*“Dosage too high”*
**Sleep Quality**7%
*“Not good for sleep”*
**Advertised Vs Actual Product**4%
*“Miss leading information”*
**Ease Of Chewing/Swallowing**4%
*“VERY HARD TO SWALLOW”*
**Functionality-Overall**3%
*“Didn't work for me”*
**Side Effects**3%
*“Side effects”*
**Acid Regulator/Stomach Ache Relief**2%
*“Stomach Pain and Discomfort”*
**Muscle Pain Relief**2%
*“Not working for muscle cramps”*
### **Top return reasons **
**Magnesium**46%
**Size-Overall**8%
**Dosage**8%
**Ease Of Chewing/Swallowing**5%
**Value For Money**5%
**Advertised Vs Actual Product**4%
**Functionality-Overall**4%
**Sleep Quality**2%
**Ingredients-Overall**2%
**Joint Pain**2%
## **Common magnesium 400 mg questions**
- **Is magnesium 400 mg profitable to sell on Amazon United States?**
- The niche generates $1.3M/yr across 21 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is -12.6%. Flapen's verdict: Skip it (49/100).
- **How competitive is the magnesium 400 mg niche?**
- 7 brands and 176 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 98% of demand.
- **What do buyers complain about in magnesium 400 mg?**
- Top complaints mined from reviews: Magnesium, Size-Overall, Dosage. The return rate is 0.0%.
- **When does demand for magnesium 400 mg peak?**
- Demand peaks in Aug–Sep; the busiest month runs 3.0× the quietest.
- **What does it cost to enter the magnesium 400 mg niche?**
- Listings span $4.10–$40.09; the average listing price is $15.39 (sweet spot $15–$100). The average incumbent carries 24,674 reviews — the moat a new listing must climb.
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