Magnesium Oxide 500mg Capsules
Skip itA deep review moat (19,507 avg reviews) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible15.6%search→purchase rate — share of searches ending in a sale
Price range
Good$5.55–$39.16cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Good$13.75avg listing price — sweet spot $15–$100
Brand share
Okay81%top-5 brand share — brands hold most of the demand
Market size
Okay$167K$167K/yr · 78K searches
Growth
Okay+5.0%90-day search growth — must beat 0% to launch
Competition
Okay68%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Review moat
Bad19,506.89avg incumbent reviews — the moat a new listing must climb
Is magnesium oxide 500mg capsules profitable on Amazon?
According to Flapen's Amazon United States niche tracking, magnesium oxide 500mg capsules is a $167K/yr Amazon United States market (78K searches/yr). The top 5 brands hold 81% of demand. Verdict: Skip it — 48/100.
Data updated Jul 28, 2026 · scored weekly · How we score niches
magnesium oxide 500mg capsules market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 13K–15K
- avg 750–1,000/product
- Revenue / yr
- $172K–$206K
- units × avg price
- Conversion rate
- 15.6%
- Avg BSR
- #477
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 83%
- Out of stock
- 0.0%
- Avg brand age
- 73 months
- Avg seller age
- 151 days
Competition: brands, sellers & click share
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.Brands
14 falling
Sellers
76
Top-5 brand share
81%
Top 20: 100%
Top-5 click share
68%
Top 20: 100%
Open market
14%
- Nature's Bounty34%
- Carlyle19%
- Amazing Nutrition13%
- Best Naturals11%
- Nutricost5%
- BulkSupplements5%
- Open — no brand owns it (8 brands, 14%)
magnesium oxide 500mg capsules demand & seasonality
Weekly Amazon search volume, last 101 weeks — +5.0% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.2×
Top magnesium oxide 500mg capsules 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.
All 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$8.744.7★105,290 rev
Carlyle Magnesium Oxide 500mg | 120 Capsules | Premium Quality
Carlyle$6.394.6★683 rev
Amazing Formulas Magnesium Oxide Supplement | 500 Mg per Serving | 90 Capsules | Non-GMO | Gluten-Free | Made in USA
Amazing Nutrition$10.114.5★797 rev
Natures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)
Nature's Bounty$16.234.7★105,290 rev
Best Naturals Magnesium Oxide 500mg 360 Tablets - 1 Year Supply - Magnesium for Immune Support Muscle Recovery Leg Cramps Relaxation
Best Naturals$18.744.6★878 rev
Newest
by launch dateNatures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)
Nature's Bounty$16.23105,290 rev
Magnesium Oxide 400mg 500 Capsules | Elemental Form for Max Concentration | Supports Calm Muscle & Nerve Health | Non-GMO
Micro Ingredients$17.52754 rev
Carlyle Magnesium Oxide 500mg | 120 Capsules | Premium Quality
Carlyle$6.39683 rev
Amazing Formulas Magnesium Oxide Supplement 500 Mg per Serving Capsules Non-GMO Gluten-Free Made in USA 180 Capsules
Amazing Nutrition$18.5236 rev
BulkSupplements.com Magnesium Oxide Capsules - Magnesium Supplement Magnesium Oxide 500mg - Gluten Free 1 Capsule per Serving 180 Count (Pack of 1)
BulkSupplements$16.26182 rev
Trending
90-day click momentumAmazing Formulas Magnesium Oxide Supplement 500 Mg per Serving Capsules Non-GMO Gluten-Free Made in USA 180 Capsules
Amazing Nutrition$18.524.8★
Magnesium Oxide 400mg 500 Capsules | Elemental Form for Max Concentration | Supports Calm Muscle & Nerve Health | Non-GMO
Micro Ingredients$17.524.6★
Best Naturals Magnesium Oxide 500mg 360 Tablets - 1 Year Supply - Magnesium for Immune Support Muscle Recovery Leg Cramps Relaxation
Best Naturals$18.744.6★
Douglas Laboratories Magnesium Oxide | Supports Normal Heart Function and Bone Formation* | 250 Capsules
Douglas Laboratories$20.504.5★
nbpure MagO7 Natural Colon Cleanse & Detox (180 Capsules)
nbpure$39.164.6★
What reviews say buyers love and hate about magnesium oxide 500mg capsules
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product and now available on Amazon”
“Great deal”
“These magnesium pills are perfect”
“Works beautifully”
“As described”
“Constipation relief”
“restful sleep”
“Good daily vitamin”
“less muscle aches, tightness”
“doesn't hurt my tummy”
What buyers complain about
“Magnesium deficiency”
“Works great, nothing helps me”
“I cant be sure that the dosage Im receiving is correct”
“have struggled with constipation”
“Too large”
“cramping or bloating”
“Overpriced”
“I have swallowing issues”
“Hard on my stomach”
“Definitely get tired after about a half hour”
Top return reasons
Common magnesium oxide 500mg capsules questions
- Is magnesium oxide 500mg capsules profitable to sell on Amazon United States?
- The niche generates $167K/yr across 18 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +5.0%. Flapen's verdict: Skip it (48/100).
- How competitive is the magnesium oxide 500mg capsules niche?
- 14 brands and 76 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 81% of demand.
- What do buyers complain about in magnesium oxide 500mg capsules?
- Top complaints mined from reviews: Magnesium, Functionality-Overall, Dosage. The return rate is 0.0%.
- When does demand for magnesium oxide 500mg capsules peak?
- Demand is steady year-round — the busiest month runs 1.2× the quietest.
- What does it cost to enter the magnesium oxide 500mg capsules niche?
- Listings span $5.55–$39.16; the average listing price is $13.75 (sweet spot $15–$100). The average incumbent carries 19,507 reviews — the moat a new listing must climb.