Is magnesium oxide profitable to sell on Amazon United States?

The niche generates $2.0M/yr across 13 tracked products. 90-day search growth is +3.4%. Flapen's verdict: Launch it (57/100).

How competitive is the magnesium oxide niche?

9 brands and 102 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 85% of demand.

What do buyers complain about in magnesium oxide?

Top complaints mined from reviews: Functionality-Overall, Magnesium, Dosage. The return rate is 0.0%.

When does demand for magnesium oxide peak?

Demand peaks in Jan; the busiest month runs 1.4× the quietest.

What does it cost to enter the magnesium oxide niche?

Listings span $6.19–$39.16; the average listing price is $14.31 (sweet spot $15–$100). The average incumbent carries 24,598 reviews — the moat a new listing must climb.

Magnesium Oxide

Launch it

A $2.0M/yr market growing +3.4% this quarter with returns at 0.0% — clears our launch bar.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible14.8%

search→purchase rate — share of searches ending in a sale

Market size

Incredible$2.0M

$2.0M/yr · 951K searches

Price range

Good$6.19–$39.16

cheapest to priciest tracked listing — scored on the share inside $15–$100

Avg price

Good$14.31

avg listing price — sweet spot $15–$100

Brand share

Okay85%

top-5 brand share — brands hold most of the demand

Competition

Okay65%

top-5 click share — leaders hold, buyers still browse

Growth

Okay+3.4%

90-day search growth — must beat 0% to launch

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Review moat

Bad24,598.46

avg incumbent reviews — the moat a new listing must climb

Is magnesium oxide profitable on Amazon?

According to Flapen's Amazon United States niche tracking, magnesium oxide is a $2.0M/yr Amazon United States market (951K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in Jan. Verdict: Launch it — 57/100.

Data updated Jul 28, 2026 · scored weekly · How we score niches

magnesium oxide market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 125K–150K; avg 8,000–10,000/product
Revenue / yr: $1.8M–$2.1M; units × avg price
Conversion rate: 14.8%
Avg BSR: #205
Page quality: 0%
Prime: 100%
Sponsored: 69%
Out of stock: 0.0%
Avg brand age: 78 months
Avg seller age: 151 days

Competition: brands, sellers & click share

The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond them.

Brands

9 falling

Sellers

102

Top-5 brand share

85%

Top 20: 100%

Top-5 click share

65%

Top 20: 100%

Open market

10%

P Puregen Labs42%
Nature Made21%
Mag-Ox 40011%
RUGBY LABORATORIES6%
Micro Ingredients5%
Nutricost5%
Open — no brand owns it (3 brands, 10%)

magnesium oxide demand & seasonality

Weekly Amazon search volume, last 104 weeks — +3.4% search growth over the last 90 days.

Peak months: Jan · busiest ÷ quietest = 1.4×

Open Trend

Top magnesium oxide search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

magnesium oxide489K/yr -2.4%8.9% conv.
magnesium oxide 400mg268K/yr +4.3%17.0% conv.
mag oxide 400 mg27K/yr +27.5%15.1% conv.
magnesium oxide 400 mg22K/yr +33.2%10.0% conv.
magnesium oxide 400+mg19K/yr +13.8%12.5% conv.
magox 400 magnesium 120 tablets18K/yr +43.5%20.2% conv.
oxido de magnesio17K/yr -15.0%2.0% conv.
magnesium -oxide10K/yr +19.0%1.9% conv.
magnesium oxide 400mg tablets10K/yr +9.0%5.9% conv.
mag oxide10K/yr +14.2%8.1% conv.

All search terms

Top magnesium oxide 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets

P Puregen Labs$8.724.6★8,231 rev

Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels

Nature Made$10.074.7★44,839 rev

Nature Made Magnesium Oxide Extra Strength 400 mg 110 Softgels

Nature Made$11.324.7★44,839 rev

Mag-Ox High Potency Magnesium Supplement Tablets 120 Count Pack of 2

Mag-Ox 400$20.514.7★9,875 rev

Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (1 Pack)

RUGBY LABORATORIES$6.194.6★1,336 rev

Newest

by launch date

Magnesium Oxide 400mg 400 Capsules | High Purity Elemental Form Extra Strength Essential Mineral Supplements for Muscle Digestion Bone & Heart Support Non-GMO & No Gluten

NatureBell$12.91299 rev

1y ago

Magnesium Oxide 400mg 500 Capsules | Elemental Form for Max Concentration | Supports Calm Muscle & Nerve Health | Non-GMO

Micro Ingredients$17.52754 rev

1y ago

Rugby Magnesium Oxide 400 mg Tablets - Dietary Supplement - Gluten-Free - 120 Count (1 Pack)

RUGBY LABORATORIES$6.191,336 rev

4y ago

Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps Relaxation - 3 Pack | Total 360 Count

P Puregen Labs$18.738,231 rev

4y ago

Magnesium 400mg [High Potency] Supplement Magnesium Oxide for Immune Support Muscle Recovery Leg Cramps and Relaxation 120 Tablets

P Puregen Labs$8.728,231 rev

5y ago

What reviews say buyers love and hate about magnesium oxide

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall17%

“Good quality and reliable brand”

Efficiency10%

“Effective”

Value For Money9%

“Great deal”

Magnesium9%

“Best magnesium supplement I have found”

Advertised Vs Actual Product7%

“As described”

Regulates Digestion7%

“Constipation relief”

Sleep Quality5%

“Helps me sleep”

Vitamin3%

“Good daily vitamin”

Acid Regulator/Stomach Ache Relief3%

“Helped My Son with Stomach Issues”

Muscle Pain Relief2%

“help me a lot relaxing my muscles”

What buyers complain about

Functionality-Overall10%

“I hardly work”

Magnesium9%

“I got the wrong magnesium”

Dosage8%

“Dose is too high for me”

Regulates Digestion7%

“will actually cause major digestive issues”

Acid Regulator/Stomach Ache Relief5%

“Hard on my stomach”

Side Effects5%

“Not worth the side effects”

Size-Overall4%

“Too large”

Sleep Quality3%

“I can not sleep properly”

Value For Money3%

“Not worth it”

Ease Of Chewing/Swallowing3%

“I have swallowing issues”

Top return reasons

Magnesium51%

Dosage14%

Charging6%

Ease Of Chewing/Swallowing4%

Value For Money4%

Functionality-Overall4%

Advertised Vs Actual Product2%

Regulates Digestion2%

Size-Overall2%

Sleep Quality2%

Common magnesium oxide questions

Is magnesium oxide profitable to sell on Amazon United States?: The niche generates $2.0M/yr across 13 tracked products. 90-day search growth is +3.4%. Flapen's verdict: Launch it (57/100).
How competitive is the magnesium oxide niche?: 9 brands and 102 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 85% of demand.
What do buyers complain about in magnesium oxide?: Top complaints mined from reviews: Functionality-Overall, Magnesium, Dosage. The return rate is 0.0%.
When does demand for magnesium oxide peak?: Demand peaks in Jan; the busiest month runs 1.4× the quietest.
What does it cost to enter the magnesium oxide niche?: Listings span $6.19–$39.16; the average listing price is $14.31 (sweet spot $15–$100). The average incumbent carries 24,598 reviews — the moat a new listing must climb.