---
title: "Magnesium Glycinate 400mg — Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-glycinate-400mg"
last_updated: "2026-08-12T16:27:58.121Z"
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description: "Amazon product research for magnesium glycinate 400mg: demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium glycinate 400mg: demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium Glycinate 400mg — Amazon US Product Research"
---
# **Magnesium Glycinate 400mg**
**Launch it**
A $5.2M/yr market growing +10.3% this quarter with returns at 0.0% — clears our launch bar.
Market size 98Growth 38Conversion 95Competition 39Returns 100Price range 83Avg price 84Brand share 60Review moat 19Quality gap 21
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Market size**
**Incredible****$5.2M**
$5.2M/yr · 2.3M searches
**Conversion**
**Incredible****12.2%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$18.52**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.79–$45.01**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****69%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****61%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Okay****+10.3%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****15,020.44**
avg incumbent reviews — the moat a new listing must climb
## **Is magnesium glycinate 400mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium glycinate 400mg is a $5.2M/yr Amazon United States market (2.3M searches/yr). The top 5 brands hold 69% of demand. Demand peaks in May. Verdict: Launch it — 63/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium glycinate 400mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **250K–300K**
- avg 15,000–20,000/product
- **Revenue / yr**
- **$4.6M–$5.6M**
- units × avg price
- **Conversion rate**
- **12.2%**
- **Avg BSR**
- **#95**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **89%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **47 months**
- **Avg seller age**
- **151 days**
## **Competition: brands, sellers & click share**
The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**15 **▲rising
**Sellers**
**87**
**Top-5 brand share**
**69%**
Top 20: 100%
**Top-5 click share**
**61%**
Top 20: 100%
**Open market**
**26%**
- Double Wood Supplements33% - Pure Encapsulations17% - Nature Made8% - Simpli Supplements6% - I LOVE HEALTH5% - Nobi Nutrition5%
## **magnesium glycinate 400mg demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +10.3% search growth over the last 90 days.
60K40KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May · busiest ÷ quietest = 2.5×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-glycinate-400mg/trend)
## **Top magnesium glycinate 400mg search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **magnesium glycinate 400mg**1.9M/yr+10.8%9.7% conv. - **magnesium glycinate 400 mg**87K/yr+5.3%6.7% conv. - **magnesium bisglycinate 400mg**33K/yr+65.0%0.5% conv. - **magnesium glycinate tablets**48K/yr+4.8%0.4% conv. - **magnesium glycinate 400**36K/yr+4.8%6.7% conv. - **glicinato de magnesio 400mg**45K/yr-2.4%2.0% conv. - **double wood magnesium glycinate**36K/yr-10.2%15.7% conv. - **400 mg magnesium glycinate**29K/yr+13.2%5.3% conv. - **magnesium glycinate small pills**29K/yr-3.3%0.2% conv. - **bisglicinato de magnesio 400mg**20K/yr-5.7%0.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/magnesium-glycinate-400mg/search-terms)
## **Top magnesium glycinate 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%10%$519K20%$1.0M30%$1.6M40%$2.1M1001K10K100K 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**Magnesium Glycinate 400mg | 180 Capsules | Sleep Muscle & Heart Support | Vegan Third Party Tested Gluten Free Non-GMO by Double Wood Supplements**Double Wood Supplements**$15.83**4.7★24,182 rev](https://www.amazon.com/dp/B0B6CTYD6S) [2**Pure Encapsulations Magnesium (Glycinate) - Supplement to Support Stress Relief Sleep Heart Health Nerves Muscles and Metabolism* - with Magnesium Glycinate - 90 Capsules**Pure Encapsulations**$26.10**4.7★49,969 rev](https://www.amazon.com/dp/B07P5K7DQP) [3**Pure Encapsulations Magnesium (Glycinate) - Supplement to Support Stress Relief Sleep Heart Health Nerves Muscles and Metabolism* - with Magnesium Glycinate - 180 Capsules**Pure Encapsulations**$45.01**4.7★49,969 rev](https://www.amazon.com/dp/B0058HWV9S) [4**Magnesium Glycinate 400mg per Serving High Absorption Gentle on Stomach Supports Sleep Relaxation Muscle Bone & Immune Health Non-GMO Vegan 180 Capsules**Simpli Supplements**$10.11**4.7★1,213 rev](https://www.amazon.com/dp/B0CVZ6QFBZ) [5**Magnesium Glycinate 400mg per Capsule 240 Capsules High Absorption Magnesium Supplement for Relaxation Calmness & Muscle Support Gentle on Stomach - for Men and Women Made in USA**I LOVE HEALTH**$19.40**4.5★158 rev](https://www.amazon.com/dp/B0GSVD8NDH)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Magnesium Glycinate 400mg per Capsule 240 Capsules High Absorption Magnesium Supplement for Relaxation Calmness & Muscle Support Gentle on Stomach - for Men and Women Made in USA**I LOVE HEALTH**$19.40**158 rev4mo ago](https://www.amazon.com/dp/B0GSVD8NDH) [**Magnesium Glycinate Gummies 400mg High Absorption Magnesium Supplement for Women Men and Kids Muscle Support and Relaxation Sugar Free Vegan 60 Days Supply**PURA WEX NUTRITION**$18.01**1,357 rev1y ago](https://www.amazon.com/dp/B0FD3MSSYX) [**THORNE - Magnesium Glycinate - Supports Restful Sleep Muscle Relaxation Heart Health & Metabolism* - Chelated Magnesium Capsules - Third-Party Certified - Gluten Dairy & Soy-Free - 90 Servings**THORNE**$25.39**2,847 rev1y ago](https://www.amazon.com/dp/B0F5XYHRPV) [**Natures Bounty High Absorption Magnesium Glycinate 240 mg for Supporting Muscle Relaxation and Bone Heart & Nerve Health Non-GMO Gluten-Free Vegetarian 120 Count/60 Servings**Nature's Bounty**$15.65**5,675 rev1y ago](https://www.amazon.com/dp/B0DT1JKGPH) [**Magnesium Glycinate 400mg High Absorption Capsules with Quercetin | Quality Sleep Relaxation & Muscle Health Supplement for Women and Men | Chelated Magnesium 120 Count (Pack of 1) | Easy to Swallow**Sandhu's**$22.09**2,848 rev1y ago](https://www.amazon.com/dp/B0DSPY1SW6)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Magnesium Glycinate 400mg per Capsule 240 Capsules High Absorption Magnesium Supplement for Relaxation Calmness & Muscle Support Gentle on Stomach - for Men and Women Made in USA**I LOVE HEALTH**$19.40**4.5★**▲ 192%**](https://www.amazon.com/dp/B0GSVD8NDH) [**Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels**Nature Made**$10.07**4.7★**▲ 179%**](https://www.amazon.com/dp/B002RS6PN4) [**Nutricost Magnesium Glycinate Capsules 180 Capsules 210mg**Nutricost**$15.43**4.7★**▲ 66%**](https://www.amazon.com/dp/B0CV2RSRFX) [**Qunol Magnesium 420mg Extra Strength High Absorption Vegetarian 180ct**Qunol**$16.14**4.7★**▲ 63%**](https://www.amazon.com/dp/B0CKGDP313) [**Natures Bounty High Absorption Magnesium Glycinate 240 mg for Supporting Muscle Relaxation and Bone Heart & Nerve Health Non-GMO Gluten-Free Vegetarian 120 Count/60 Servings**Nature's Bounty**$15.65**4.7★**▲ 45%**](https://www.amazon.com/dp/B0DT1JKGPH)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium glycinate 400mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**21%
*“Great for sleeping”*
**Quality-Overall**18%
*“the quality has been very consistent”*
**Magnesium**12%
*“Great Magnesium Gummies”*
**Value For Money**7%
*“They are affordable”*
**Advertised Vs Actual Product**5%
*“arrived as described”*
**Vitamin**4%
*“Best Vitamins”*
**Muscle Pain Relief**3%
*“muscle recovery”*
**Efficiency**3%
*“Effective”*
**Ease Of Chewing/Swallowing**2%
*“Love chewables”*
**Taste-Overall**2%
*“Taste is very pleasing”*
### **What buyers complain about **
**Magnesium**12%
*“Low dose of actual magnesium”*
**Sleep Quality**12%
*“Did not help with sleep”*
**Dosage**10%
*“Dosage too high”*
**Functionality-Overall**5%
*“No results”*
**Size-Overall**4%
*“They are HUGE”*
**Advertised Vs Actual Product**4%
*“False advertisement”*
**Quality-Overall**4%
*“Poor quality control”*
**Side Effects**4%
*“Made me sick”*
**Acid Regulator/Stomach Ache Relief**3%
*“Stomach pain”*
**Value For Money**3%
*“A little pricey”*
### **Top return reasons **
**Magnesium**23%
**Value For Money**13%
**Dosage**11%
**Functionality-Overall**8%
**Acid Regulator/Stomach Ache Relief**6%
**Sleep Quality**6%
**Advertised Vs Actual Product**4%
**Size-Overall**4%
**Ease Of Chewing/Swallowing**3%
**Joint Pain**3%
## **Common magnesium glycinate 400mg questions**
- **Is magnesium glycinate 400mg profitable to sell on Amazon United States?**
- The niche generates $5.2M/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +10.3%. Flapen's verdict: Launch it (63/100).
- **How competitive is the magnesium glycinate 400mg niche?**
- 15 brands and 87 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 69% of demand.
- **What do buyers complain about in magnesium glycinate 400mg?**
- Top complaints mined from reviews: Magnesium, Sleep Quality, Dosage. The return rate is 0.0%.
- **When does demand for magnesium glycinate 400mg peak?**
- Demand peaks in May; the busiest month runs 2.5× the quietest.
- **What does it cost to enter the magnesium glycinate 400mg niche?**
- Listings span $9.79–$45.01; the average listing price is $18.52 (sweet spot $15–$100). The average incumbent carries 15,020 reviews — the moat a new listing must climb.
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