---
title: "Magnesium Citrate 400mg — $16K/mo Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-citrate-400mg"
last_updated: "2026-08-12T16:27:32.471Z"
locale: en
meta:
description: "Amazon product research for magnesium citrate 400mg: $16K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium citrate 400mg: $16K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium Citrate 400mg — $16K/mo Amazon US Product Research"
---
# **Magnesium Citrate 400mg**
**Worth a look**
Shows low returns (0.0%), but a deep review moat (10,519 avg reviews) keeps it on the watch list.
Market size 38Growth 24Conversion 80Competition 49Returns 100Price range 72Avg price 77Brand share 55Review moat 21Quality gap 22
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****8.3%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$15.96**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$7.77–$33.48**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****72%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****56%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Okay****$189K**
$189K/yr · 143K searches
**Growth**
**Bad****-1.8%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****10,519**
avg incumbent reviews — the moat a new listing must climb
## **Is magnesium citrate 400mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium citrate 400mg is a $189K/yr Amazon United States market (143K searches/yr). The top 5 brands hold 72% of demand. Verdict: Worth a look — 51/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium citrate 400mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **15K–20K**
- avg 500–750/product
- **Revenue / yr**
- **$239K–$319K**
- units × avg price
- **Conversion rate**
- **8.3%**
- **Avg BSR**
- **#362**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **75%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **76 months**
- **Avg seller age**
- **154 days**
## **Competition: brands, sellers & click share**
The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▼falling
**Sellers**
**641**
**Top-5 brand share**
**72%**
Top 20: 100%
**Top-5 click share**
**56%**
Top 20: 96%
**Open market**
**23%**
- SOLARAY24% - Nature Made17% - PhiNaturals16% - NOW Foods9% - Pure Encapsulations6% - DEAL SUPPLEMENT5%
## **magnesium citrate 400mg demand & seasonality**
Weekly Amazon search volume, last 102 weeks — -1.8% search growth over the last 90 days.
3K2KPrime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-citrate-400mg/trend)
## **Top magnesium citrate 400mg search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **magnesium citrate 400mg**66K/yr-4.3%9.4% conv. - **citrato de magnesio 400mg**25K/yr+2.9%3.0% conv. - **magnesium citrate 400 mg**14K/yr+17.8%7.0% conv. - **solaray magnesium citrate**11K/yr-14.8%15.2% conv. - **magnesium citrate 400**6K/yr+68.1%6.4% conv. - **magnesio citrato 400 mg**4K/yr-17.0%3.9% conv. - **magnesium citrate solaray**4K/yr-20.8%16.3% conv. - **solaray magnesium citrate 400mg**3K/yr-6.4%24.8% conv. - **magnesium citrate capsules 400mg**3K/yr-22.2%9.8% conv. - **magnesium citrate 400mg capsules**3K/yr-24.6%8.7% conv. [**All search terms **](https://flapen.com/research/us/health-household/magnesium-citrate-400mg/search-terms)
## **Top magnesium citrate 400mg 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%5%$9K10%$19K15%$28K20%$38K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**SOLARAY Magnesium Citrate 400mg - Magnesium Supplement - Bone Health Muscle Relaxation and Heart Health Support - Vegan Gluten Free - 60 Servings 180 VegCaps**SOLARAY**$18.98**4.7★3,247 rev](https://www.amazon.com/dp/B07988Q85C) [2**Magnesium Citrate Powder Capsules 400mg - 180 Count Veg Caps - PhiNaturals Supplements - Nervous System Support and Enzyme Function**PhiNaturals**$14.92**4.7★14,062 rev](https://www.amazon.com/dp/B01KY6NH9A) [3**Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets**Nature Made**$13.29**4.4★75 rev](https://www.amazon.com/dp/B0GN5891HN) [4**NOW Supplements Magnesium Citrate Enzyme Function* Nervous System Support* 120 Veg Capsules**NOW Foods**$9.97**4.7★25,502 rev](https://www.amazon.com/dp/B0014M1VII) [5**Magnesium Citrate 400mg Per Serving 300 Veggie Capsules Chelated Easily Absorbed Purified Trace Mineral Muscle Heart & Digestive Support Non-GMO**DEAL SUPPLEMENT**$16.63**4.7★1,156 rev](https://www.amazon.com/dp/B0BWGPJNTR)
**~~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) [**Vitamatic Magnesium Citrate 500mg per Serving - 180 Vegetarian Capsules (Provides 150 mg of Elemental Magnesium) - Added B6 for Maximum Absorption - Supports Muscle Joint and Heart Health***Vitamatic**$9.87**1,957 rev2y ago](https://www.amazon.com/dp/B0CPWXPY6X) [**Magnesium Citrate 400mg Per Serving 300 Veggie Capsules Chelated Easily Absorbed Purified Trace Mineral Muscle Heart & Digestive Support Non-GMO**DEAL SUPPLEMENT**$16.63**1,156 rev3y ago](https://www.amazon.com/dp/B0BWGPJNTR) [**Brieofood Magnesium Citrate 400 mg (Elemental Mg) per Serving - 250 Tablets - Muscle Relaxation (Citrato de Magnesio)**Brieofood**$10.12**324 rev3y ago](https://www.amazon.com/dp/B0BTJD6V2J) [**Magnesium Citrate 800mg 180 Capsules Digestion & Constipation Support Vegan Safe Non-GMO Double Wood Supplements**Double Wood Supplements**$14.72**6,076 rev4y ago](https://www.amazon.com/dp/B0B526QJ9D)
**~~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★**▲ 260%**](https://www.amazon.com/dp/B0GN5891HN) [**NOW Supplements Magnesium Citrate Enzyme Function* Nervous System Support* 120 Veg Capsules**NOW Foods**$9.97**4.7★**▲ 39%**](https://www.amazon.com/dp/B0014M1VII) [**Magnesium Citrate 800mg 180 Capsules Digestion & Constipation Support Vegan Safe Non-GMO Double Wood Supplements**Double Wood Supplements**$14.72**4.6★**▲ 26%**](https://www.amazon.com/dp/B0B526QJ9D) [**SOLARAY Magnesium Glycinate Capsules Chelated Magnesium Bisglycinate w/BioPerine Higher Absorption Magnesium Supplement - Bones Muscles Heart Support Vegan (30 Servings 120 VegCaps)**SOLARAY**$17.95**4.7★**▲ 21%**](https://www.amazon.com/dp/B09L57WWMY) [**Pure Encapsulations Magnesium (Citrate) - Supplement for Sleep Heart Health Cognitive Health Bone Health Energy Muscles and Metabolism* - with Premium Magnesium - 180 Capsules**Pure Encapsulations**$33.48**4.7★**▲ 18%**](https://www.amazon.com/dp/B0017CRZIK)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium citrate 400mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**23%
*“Excellent Quality”*
**Magnesium**14%
*“Best magnesium ever”*
**Sleep Quality**9%
*“Helps me sleep”*
**Value For Money**5%
*“Great Value for the Money”*
**Vitamin**5%
*“Excellent vitamin”*
**Advertised Vs Actual Product**5%
*“As described”*
**Efficiency**5%
*“Works Fast”*
**Regulates Digestion**4%
*“Does not upset my stomach or anything”*
**Muscle Pain Relief**3%
*“reduce muscle cramping”*
**Ease Of Chewing/Swallowing**3%
*“Easy to swallow”*
### **What buyers complain about **
**Magnesium**14%
*“Magnesium deficiency”*
**Size-Overall**13%
*“Too big”*
**Dosage**7%
*“Misleading Dosage”*
**Functionality-Overall**6%
*“Not effective like another brand I use”*
**Advertised Vs Actual Product**4%
*“False advertising”*
**Ease Of Chewing/Swallowing**4%
*“Large, uncomfortable pill to swallow”*
**Regulates Digestion**4%
*“Does not help with digestion”*
**Quality-Overall**3%
*“it's a sign of bad quality control”*
**Sleep Quality**3%
*“Does not help with sleep”*
**Side Effects**3%
*“Harsh on stomach”*
### **Top return reasons **
**Magnesium**60%
**Advertised Vs Actual Product**9%
**Dosage**9%
**Ease Of Chewing/Swallowing**8%
**Functionality-Overall**7%
**Size-Overall**3%
**Hard Feel**2%
**Ingredients-Overall**2%
## **Common magnesium citrate 400mg questions**
- **Is magnesium citrate 400mg profitable to sell on Amazon United States?**
- The niche generates $189K/yr across 24 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (51/100).
- **How competitive is the magnesium citrate 400mg niche?**
- 17 brands and 641 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 72% of demand.
- **What do buyers complain about in magnesium citrate 400mg?**
- Top complaints mined from reviews: Magnesium, Size-Overall, Dosage. The return rate is 0.0%.
- **When does demand for magnesium citrate 400mg peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the magnesium citrate 400mg niche?**
- Listings span $7.77–$33.48; the average listing price is $15.96 (sweet spot $15–$100). The average incumbent carries 10,519 reviews — the moat a new listing must climb.
## **Related niches to research next**
Same-category niches scoring near this one — the next ones worth researching.
- 76 [**cedar oil**](https://flapen.com/research/us/health-household/cedar-oil)$1.2M/yr+214.4%**Launch it**- 77 [**nutrapure glp1 cutting mix**](https://flapen.com/research/us/health-household/nutrapure-glp1-cutting-mix)$149K/yr+940.2%**Worth a look**- 77 [**dexcom g7**](https://flapen.com/research/us/health-household/dexcom-g7)$2.0M/yr+39.9%**Launch it**- 77 [**purelia**](https://flapen.com/research/us/health-household/purelia)$635K/yr+359.7%**Worth a look**- 77 [**graduation napkins**](https://flapen.com/research/us/health-household/graduation-napkins)$302K/yr+385.7%**Worth a look**- 77 [**credit card wand**](https://flapen.com/research/us/health-household/credit-card-wand)$418K/yr+101.3%**Worth a look**[**All Health & Household niches **](https://flapen.com/research/us/health-household)