---
title: "Sundown Magnesium 500mg — $323K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/sundown-magnesium-500mg"
last_updated: "2026-08-11T06:27:30.514Z"
locale: en
meta:
description: "Niche score 37/100 · $323K/yr market · 256K searches/yr · $10.12 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 37/100 · $323K/yr market · 256K searches/yr · $10.12 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Sundown Magnesium 500mg — $323K/yr Amazon US Niche (2026) - Flapen"
---
# **sundown magnesium 500mg**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 52Growth 31Conversion 95Competition 3Returns 100Price range 12Avg price 34Brand share 0Review moat 6Quality gap 20
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****12.5%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Good****$323K**
$323K/yr · 256K searches
**Avg price**
**Okay****$10.12**
avg listing price — sweet spot $15–$100
**Growth**
**Okay****+5.1%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Price range**
**Bad****$5.55–$16.23**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Bad****39,564.83**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****96%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, sundown magnesium 500mg is a $323K/yr Amazon United States market (256K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul. Verdict: Skip it — 37/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sundown magnesium 500mg market data**
- **Units sold / yr**
- **40K–50K**
- avg 6,000–8,000/product
- **Revenue / yr**
- **$405K–$506K**
- units × avg price
- **Conversion rate**
- **12.5%**
- **Avg BSR**
- **#147**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **83%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **65 months**
- **Avg seller age**
- **144 days**
## **Competition & brand share**
The top 5 products capture 96% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**3 **—flat
**Sellers**
**43**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**96%**
Top 20: 100%
**Open market**
**0%**
- Nature's Bounty93% - Life Extension4% - Horbäach4%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +5.1% search growth over the last 90 days.
6K4KSpike '24Spike '25Prime Day '25 seasonSepDecMarJunAugNovMarMay
Peak months: Jul · busiest ÷ quietest = 1.8×
[**Open Trend **](https://flapen.com/research/us/health-household/sundown-magnesium-500mg/trend)
## **Top sundown magnesium 500mg search terms**
- **magnesium 500mg**61K/yr-0.6%14.5% conv. - **natures bounty magnesium**36K/yr-3.0%12.0% conv. - **magnesium 500 mg**24K/yr+3.9%11.0% conv. - **magnesium 500**21K/yr+25.0%9.3% conv. - **magnesium natures bounty**17K/yr-11.3%15.0% conv. - **500 mg magnesium**12K/yr+33.2%7.7% conv. - **magnesium 500 mg tablets**12K/yr+19.6%8.6% conv. - **magnesium 500mg capsules**9K/yr+33.1%6.6% conv. - **magnesium capsules 500mg**9K/yr+31.4%4.5% conv. - **natures bounty magnesium 500mg**9K/yr-6.4%26.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/sundown-magnesium-500mg/search-terms)
## **Top sundown magnesium 500mg products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%20%$65K40%$129K60%$194K80%$259K1K10K100K1.0M Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 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**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) [3**Natures Bounty Magnesium Mineral Supplement Supports Bone and Muscle Health 500 mg Coated Tablets 100 Count**Nature's Bounty**$5.55**4.7★1,640 rev](https://www.amazon.com/dp/B0009F3NUA) [4**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) [5**Life Extension Magnesium Caps 500 mg Magnesium Oxide Citrate and Succinate Heart Health Healthy Bones Metabolism Support 100 Vegetarian Capsules**Life Extension**$8.38**4.7★16,772 rev](https://www.amazon.com/dp/B00A7HDABW)
**~~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) [**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) [**Horbach Magnesium 500mg | 180 Caplets**Horbäach**$6.19**2,722 rev3y ago](https://www.amazon.com/dp/B0B8T57N76) [**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**105,290 rev12y ago](https://www.amazon.com/dp/B00H5PJ0HW) [**Life Extension Magnesium Caps 500 mg Magnesium Oxide Citrate and Succinate Heart Health Healthy Bones Metabolism Support 100 Vegetarian Capsules**Life Extension**$8.38**16,772 rev22y ago](https://www.amazon.com/dp/B00A7HDABW)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**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★**▲ 21%**](https://www.amazon.com/dp/B0DT1JKGPH) [**Natures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)**Nature's Bounty**$16.23**4.7★**▲ 15%**](https://www.amazon.com/dp/B08C65K2WC) [**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★**— 2%**](https://www.amazon.com/dp/B00H5PJ0HW) [**Natures Bounty Magnesium Mineral Supplement Supports Bone and Muscle Health 500 mg Coated Tablets 100 Count**Nature's Bounty**$5.55**4.7★**— 4%**](https://www.amazon.com/dp/B0009F3NUA) [**Horbach Magnesium 500mg | 180 Caplets**Horbäach**$6.19**4.6★**▼ 18%**](https://www.amazon.com/dp/B0B8T57N76)
**~~View all trending →~~**
## **What buyers say about sundown magnesium 500mg**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**17%
*“Good quality and reliable brand”*
**Sleep Quality**15%
*“Helps me sleep”*
**Value For Money**12%
*“Good value for the money”*
**Magnesium**11%
*“Good Magnesium Supplement”*
**Vitamin**5%
*“The best vitamin for your body”*
**Advertised Vs Actual Product**5%
*“AS advertised”*
**Muscle Pain Relief**5%
*“sore muscles has been nice”*
**Efficiency**3%
*“Doing the job working well”*
**Joint Pain**2%
*“Good for achy joints”*
**Ease Of Chewing/Swallowing**2%
*“not hard to swallow”*
### **What buyers complain about **
**Magnesium**10%
*“I tend to get low on magnesium”*
**Size-Overall**8%
*“The tablets are unusually huge”*
**Quality-Overall**6%
*“Poor quality control”*
**Sleep Quality**6%
*“I had trouble sleeping”*
**Ease Of Chewing/Swallowing**5%
*“Hard to swallow”*
**Dosage**4%
*“Messed me up bad after just one dose”*
**Value For Money**4%
*“to expensive to buy again”*
**Smell**3%
*“Bad Chemical Smell and Taste”*
**Functionality-Overall**3%
*“Does not work”*
**Pain Relief-Overall**3%
*“arm pain at night when sleeping”*
### **Top return reasons **
**Magnesium**39%
**Value For Money**11%
**Advertised Vs Actual Product**7%
**Dosage**7%
**Charging**4%
**Vitamin**4%
**Functionality-Overall**4%
**Product Condition**4%
**Durability**4%
**Size-Overall**4%
## **Common questions**
- **Is sundown magnesium 500mg profitable to sell on Amazon United States?**
- The niche generates $323K/yr across 6 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +5.1%. Flapen's verdict: Skip it (37/100).
- **How competitive is the sundown magnesium 500mg niche?**
- 3 brands and 43 sellers compete. The top 5 products take 96% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in sundown magnesium 500mg?**
- Top complaints mined from reviews: Magnesium, Size-Overall, Quality-Overall. The return rate is 0.0%.
- **When does demand for sundown magnesium 500mg peak?**
- Demand peaks in Jul; the busiest month runs 1.8× the quietest.
- **What does it cost to enter the sundown magnesium 500mg niche?**
- Listings span $5.55–$16.23; the average listing price is $10.12 (sweet spot $15–$100). The average incumbent carries 39,565 reviews — the moat a new listing must climb.
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