---
title: "Magnesium Glycinate 300mg — Amazon US Product Research"
canonical_url: "https://flapen.com/research/us/health-household/magnesium-glycinate-300mg"
last_updated: "2026-08-12T16:27:55.295Z"
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description: "Amazon product research for magnesium glycinate 300mg: $52K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for magnesium glycinate 300mg: $52K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Magnesium Glycinate 300mg — Amazon US Product Research"
---
# **Magnesium Glycinate 300mg**
**Worth a look**
Shows low returns (0.0%), but soft demand (-9.5% this quarter) keeps it on the watch list.
Market size 65Growth 20Conversion 85Competition 27Returns 100Price range 89Avg price 95Brand share 44Review moat 20Quality gap 20
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$25.84**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.82–$83.43**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****9.5%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$628K**
$628K/yr · 256K searches
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-9.5%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****13,020.35**
avg incumbent reviews — the moat a new listing must climb
## **Is magnesium glycinate 300mg profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, magnesium glycinate 300mg is a $628K/yr Amazon United States market (256K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Jul. Verdict: Worth a look — 52/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **magnesium glycinate 300mg market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **25K–30K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **$646K–$775K**
- units × avg price
- **Conversion rate**
- **9.5%**
- **Avg BSR**
- **#146**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **100%**
- **Out of stock**
- **5.3%**
- **Avg brand age**
- **51 months**
- **Avg seller age**
- **155 days**
## **Competition: brands, sellers & click share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▼falling
**Sellers**
**574**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**17%**
- tnvitamins22% - Pure Encapsulations19% - Qunol17% - Nature Made15% - Nature's Bounty6% - THORNE4% - Open — no brand owns it (8 brands, 17%)
## **magnesium glycinate 300mg demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -9.5% search growth over the last 90 days.
6K4KSpike '25Prime Day '25Black Friday '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/health-household/magnesium-glycinate-300mg/trend)
## **Top magnesium glycinate 300mg search terms shoppers use**
The exact queries shoppers type, with yearly volume, growth and conversion.
- **magnesium glycinate 300mg**174K/yr-12.0%8.9% conv. - **magnesium glycinate 300 mg**32K/yr-4.6%7.1% conv. - **magnesium glycinate 300**12K/yr-8.5%10.0% conv. - **magnesium glycinate 300 mg for women**10K/yr+52.6%4.5% conv. - **magnesium glycinate 320 mg for women**13K/yr+3.4%2.2% conv. - **magnesium glycinate 320 mg**15K/yr-25.7%5.3% conv. [**All search terms **](https://flapen.com/research/us/health-household/magnesium-glycinate-300mg/search-terms)
## **Top magnesium glycinate 300mg 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%$63K20%$126K30%$188K40%$251K1001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**tnvitamins Magnesium Glycinate 300mg 90 Capsules | High Absorption Chelated Magnesium for Sleep Calm & Muscle Support* | Non-GMO Gentle Non-Laxative | TNVitamins**tnvitamins**$9.82**4.7★3,749 rev](https://www.amazon.com/dp/B0B4PRL1SK) [2**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) [3**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) [4**Qunol Magnesium Glycinate Tablets 300mg 100% Chelated Gluten-Free 90ct**Qunol**$18.06**4.6★6,509 rev](https://www.amazon.com/dp/B0DBMX2YPV) [5**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★5,675 rev](https://www.amazon.com/dp/B0DT1JKGPH)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**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) [**Micro Ingredients Magnesium Glycinate 350mg Per Serving 240 Veggie Capsules | Potent Elemental Form 100% Chelated Highly Bioavailable | Healthy Muscle Bones & Mood Support Supplement | Non-GMO**Micro Ingredients**$17.98**332 rev1y ago](https://www.amazon.com/dp/B0DWDHJZ4T) [**Qunol Magnesium Glycinate Tablets 300mg 100% Chelated Gluten-Free 150ct**Qunol**$28.24**6,509 rev1y ago](https://www.amazon.com/dp/B0DNV31VXS) [**Life Extension Magnesium Glycinate Heart Health Bone Health Nerve and Muscle Support Highly absorbable Gluten-Free Non-GMO Vegetarian 90 Capsules**Life Extension**$16.64**2,110 rev1y ago](https://www.amazon.com/dp/B0DMTV24LR)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Designs for Health Magnesium Glycinate Complex - High Absorption Patented Magnesium Complex - Promotes Calm Sleep Energy Bone & Heart Health and Immune Support - Vegan Gluten Free (120 Capsules)**Designs for Health**$33.96**4.6★**▲ 32%**](https://www.amazon.com/dp/B000FGWBK6) [**Pure Encapsulations Magnesium (Glycinate) - Supplement to Support Stress Relief Sleep Heart Health Nerves Muscles and Metabolism* - with Magnesium Glycinate - 360 Capsules**Pure Encapsulations**$83.43**4.7★**▲ 17%**](https://www.amazon.com/dp/B0017HYB2I) [**Now Foods Magnesium Glycinate 240 Tablets - Supports Healthy Muscle and Nerve Functions - Non-GMO**NOW Foods**$28.86**4.8★**▲ 16%**](https://www.amazon.com/dp/B0CB984SHQ) [**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★**▲ 14%**](https://www.amazon.com/dp/B0058HWV9S) [**Nature Made Magnesium Glycinate 300 mg per 3 Capsules 90 Capsules**Nature Made**$21.13**4.7★**— 9%**](https://www.amazon.com/dp/B0D9MV3YJQ)
**~~View all trending →~~**
## **What reviews say buyers love and hate about magnesium glycinate 300mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**22%
*“Deep sleep”*
**Quality-Overall**20%
*“Amazing quality”*
**Magnesium**12%
*“Best magnesium supplement”*
**Value For Money**6%
*“They are affordable”*
**Advertised Vs Actual Product**5%
*“arrived as described”*
**Vitamin**3%
*“Very happy with the vitamins”*
**Muscle Pain Relief**3%
*“Eases muscle cramping”*
**Efficiency**3%
*“Works ok”*
**Stress/Anxiety**2%
*“Helps with anxiety and stress”*
**Ease Of Chewing/Swallowing**2%
*“Easier to swallow”*
### **What buyers complain about **
**Sleep Quality**12%
*“Cant sleep”*
**Magnesium**11%
*“Too much magnesium”*
**Dosage**9%
*“Dosage too high”*
**Size-Overall**6%
*“Very large pills”*
**Quality-Overall**4%
*“NO quality control”*
**Functionality-Overall**4%
*“noticed no results”*
**Side Effects**4%
*“Bad Side effects”*
**Acid Regulator/Stomach Ache Relief**3%
*“Stomach pain”*
**Value For Money**3%
*“A little pricey”*
**Ease Of Chewing/Swallowing**3%
*“VERY DIFFICULT TO SWALLOW”*
### **Top return reasons **
**Magnesium**16%
**Value For Money**12%
**Dosage**10%
**Functionality-Overall**8%
**Advertised Vs Actual Product**8%
**Acid Regulator/Stomach Ache Relief**7%
**Size-Overall**5%
**Sleep Quality**5%
**Ingredients-Overall**3%
**Vitamin**3%
## **Common magnesium glycinate 300mg questions**
- **Is magnesium glycinate 300mg profitable to sell on Amazon United States?**
- The niche generates $628K/yr across 17 tracked products. 90-day search growth is -9.5%. Flapen's verdict: Worth a look (52/100).
- **How competitive is the magnesium glycinate 300mg niche?**
- 14 brands and 574 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in magnesium glycinate 300mg?**
- Top complaints mined from reviews: Sleep Quality, Magnesium, Dosage. The return rate is 0.0%.
- **When does demand for magnesium glycinate 300mg peak?**
- Demand peaks in Jul; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the magnesium glycinate 300mg niche?**
- Listings span $9.82–$83.43; the average listing price is $25.84 (sweet spot $15–$100). The average incumbent carries 13,020 reviews — the moat a new listing must climb.
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