Is magnesium profitable to sell on Amazon United States?

The niche generates $2.2M/yr across 24 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -5.9%. Flapen's verdict: Worth a look (52/100).

How competitive is the magnesium niche?

14 brands and 110 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 79% of demand.

What do buyers complain about in magnesium?

Top complaints mined from reviews: Magnesium, Sleep Quality, Dosage. The return rate is 0.0%.

When does demand for magnesium peak?

Demand peaks in Aug–Sep; the busiest month runs 2.6× the quietest.

What does it cost to enter the magnesium niche?

Listings span $4.10–$45.01; the average listing price is $17.86 (sweet spot $15–$100). The average incumbent carries 23,930 reviews — the moat a new listing must climb.

Magnesium

Worth a look

Shows low returns (0.0%), but a deep review moat (23,930 avg reviews) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Market size

Incredible$2.2M

$2.2M/yr · 4.4M searches

Avg price

Great$17.86

avg listing price — sweet spot $15–$100

Price range

Good$4.10–$45.01

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

Brand share

Okay79%

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

Competition

Okay62%

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

Conversion

Okay2.8%

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

Growth

Bad-5.9%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Review moat

Bad23,929.83

avg incumbent reviews — the moat a new listing must climb

Is magnesium profitable on Amazon?

According to Flapen's Amazon United States niche tracking, magnesium is a $2.2M/yr Amazon United States market (4.4M searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Aug–Sep. Verdict: Worth a look — 52/100.

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

magnesium market size & sales

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

Units sold / yr: 200K–250K; avg 12,500–15,000/product
Revenue / yr: $3.6M–$4.5M; units × avg price
Conversion rate: 2.8%
Avg BSR: #60
Page quality: 0%
Prime: 100%
Sponsored: 92%
Out of stock: 0.0%
Avg brand age: 58 months
Avg seller age: 146 days

Competition: brands, sellers & click share

The top 5 products take 62% of clicks — established leaders, but buyers still shop beyond them.

Brands

14 rising

Sellers

110

Top-5 brand share

79%

Top 20: 100%

Top-5 click share

62%

Top 20: 94%

Open market

17%

Nature's Bounty32%
Nature Made27%
Pure Encapsulations11%
Nobi Nutrition5%
BIOptimizers4%
Nutricost3%
Open — no brand owns it (8 brands, 17%)

magnesium demand & seasonality

Weekly Amazon search volume, last 104 weeks — -5.9% search growth over the last 90 days.

Peak months: Aug, Sep · busiest ÷ quietest = 2.6×

Open Trend

Top magnesium search terms shoppers use

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

mag1.8M/yr +2.6%0.1% conv.
magnesium supplement844K/yr -51.0%7.2% conv.
magn372K/yr +8.8%0.3% conv.
magnesium for women115K/yr -8.2%4.8% conv.
magnesium sleep143K/yr -11.5%3.5% conv.
magnesium supplement for women84K/yr -10.7%5.4% conv.
magnesium pills72K/yr +9.6%7.4% conv.
magnecio56K/yr +7.5%1.8% conv.
magnesium for constipation63K/yr +2.1%2.4% conv.
magnesium 250 mg59K/yr +9.7%22.9% conv.

All search terms

Top magnesium 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 24 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

Nature Made Magnesium Oxide 250 mg for Muscle Relaxation 200 Tablets

Nature Made$6.804.7★34,776 rev

Pure Encapsulations Magnesium (Glycinate) - Supplement to Support Stress Relief Sleep Heart Health Nerves Muscles and Metabolism* - with Magnesium Glycinate - 90 Capsules

Pure Encapsulations$26.104.7★49,969 rev

Nature Made Magnesium 250mg 100 Tablets

Nature Made$4.104.7★27,696 rev

BIOptimizers Magnesium Breakthrough Supplement with 500mg - 7 Forms of Magnesium: Glycinate Malate Citrate and More - Natural Support for Sleep and Cognitive Function -30 Capsules- Calming Vitamins

BIOptimizers$20.614.6★18,865 rev

Newest

by launch date

Magnesium Complex for Women & Men 500mg (7-in-1) Magnesium Glycinate with Vegan D3 B6 and Manganese (Made In USA) + Gluconate Citrate Malate Taurate Orotate Carbonate (Oxide-Free) Small Capsule

Etta Vita$26.28402 rev

4mo ago

Natures Bounty Magnesium Supplements 500mg Tablets Support Bone & Muscle Health 200 Count (Pack of 2)

Nature's Bounty$16.23105,290 rev

8mo ago

Magnesium Complex for Women | Glycinate Citrate & More 20-in-1 Formula with D3 K2 (MK-7) B6 (as P5P) & Ashwagandha | 240 Vegetarian Capsules Filler Free Non-GMO

Micro Ingredients$23.46247 rev

9mo ago

Magnesium Complex 700mg | 12-in-1 High Absorption Supplement | Glycinate Citrate Malate Taurate & More | Sleep Support Muscle Cramp Relief Stress Heart Bone & Nerve Health | 120 Vegan Capsules

Vccvaa$10.132,810 rev

1y ago

THORNE - Magnesium Glycinate - Supports Restful Sleep Muscle Relaxation Heart Health & Metabolism* - Chelated Magnesium Capsules - Third-Party Certified - Gluten Dairy & Soy-Free - 90 Servings

THORNE$25.392,847 rev

1y ago

What reviews say buyers love and hate about magnesium

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

What buyers love

Sleep Quality19%

“Great for sleeping”

Quality-Overall17%

“Quality is pure”

Magnesium16%

“Best Magnesium supplement”

Value For Money5%

“Great buy”

Vitamin5%

“Best vitamins”

Advertised Vs Actual Product4%

“Exactly as advertised”

Muscle Pain Relief4%

“Eases muscle cramping”

Efficiency4%

“Works ok”

Ease Of Chewing/Swallowing2%

“Not hard to swallow”

Stress/Anxiety2%

“Relaxing”

What buyers complain about

Magnesium11%

“Low magnesium”

Sleep Quality10%

“Does not help you sleep”

Dosage8%

“1000mg is too high of dose”

Acid Regulator/Stomach Ache Relief5%

“Horrible stomach pains”

Size-Overall5%

“Too Big”

Functionality-Overall5%

“noticed no results”

Side Effects5%

“Bad Side effects”

Value For Money4%

“Way overpriced”

Quality-Overall4%

“Poor Quality Control”

Ease Of Chewing/Swallowing2%

“powder taste bad if you try to chew it or anything”

Top return reasons

Magnesium32%

Dosage11%

Functionality-Overall7%

Value For Money7%

Acid Regulator/Stomach Ache Relief6%

Advertised Vs Actual Product4%

Ingredients-Overall4%

Sleep Quality4%

Ease Of Chewing/Swallowing3%

Size-Overall3%

Common magnesium questions

Is magnesium profitable to sell on Amazon United States?: The niche generates $2.2M/yr across 24 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -5.9%. Flapen's verdict: Worth a look (52/100).
How competitive is the magnesium niche?: 14 brands and 110 sellers compete. The top 5 products take 62% of clicks and top 5 brands hold 79% of demand.
What do buyers complain about in magnesium?: Top complaints mined from reviews: Magnesium, Sleep Quality, Dosage. The return rate is 0.0%.
When does demand for magnesium peak?: Demand peaks in Aug–Sep; the busiest month runs 2.6× the quietest.
What does it cost to enter the magnesium niche?: Listings span $4.10–$45.01; the average listing price is $17.86 (sweet spot $15–$100). The average incumbent carries 23,930 reviews — the moat a new listing must climb.