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magnesium roll on

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A small market ($68K/yr) — this niche doesn't clear our bar today.

Market size 17Growth 24Conversion 69Competition 41Returns 98Price range 52Avg price 67Brand share 39Review moat 25Quality gap 72

Returns

Incredible0.4%

return rate — above 6% kills the launch gate

Quality gap

Good4.3★

avg incumbent rating — lower means beatable quality

Conversion

Good6.3%

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

Avg price

Good$14.02

avg listing price — sweet spot $15–$100

Price range

Good$5.49–$25.17

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

Competition

Okay61%

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

Brand share

Okay81%

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

Review moat

Bad4,258.75

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-2.9%

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

Market size

Bad$68K

$68K/yr · 77K searches

Competition

The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 falling

Sellers

35

Top-5 brand share

81%

Open market

15%

  • Seven Minerals27%
  • Theraworx22%
  • M3 Naturals15%
  • VAL9%
  • LIFE-FLO8%
  • EPSOM-IT4%
  • Open — no brand owns it (9 brands, 15%)

Product shelf

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%5%$3K10%$7K15%$10K20%$14K1101001K10K100K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -2.9% search growth over the last 90 days.
2K2KPrime Day '24Spike '24Spike '25Prime Day '25Spike '26SepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

Reviews

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

What buyers love

Smell17%

“Light scent”

Efficiency13%

“somewhat effective”

Quality-Overall11%

“Decent enough product”

Muscle Pain Relief5%

“Works for muscle pain”

Sleep Quality5%

“Restful sleep”

Value For Money4%

“Good deal”

Ease Of Use4%

“Goes on easy”

Magnesium4%

“MAGNificent MAGNESIUM”

Soft Feel4%

“Make your feet so soft”

Ease Of Application3%

“Ease of application”

What buyers complain about

Functionality-Overall16%

“Did not work on me”

Allergies8%

“Skin Irritation”

Adhesion/Stickiness5%

“didn't care for the stickiness”

Moist/Dry5%

“Not hydrating”

Skin Health5%

“tore up the skin”

Smell4%

“Dont like the scent”

Sleep Quality3%

“have issues sleeping”

Pain Relief-Overall3%

“Does not help with pain”

Value For Money3%

“a little pricey”

Oily/Greasy2%

“its greasy”

Top return reasons

Functionality-Overall30%
Smell12%
Advertised Vs Actual Product11%
Adhesion/Stickiness6%
Size-Overall6%
Leak-Proof4%
Skin Health3%
Value For Money3%
Moist/Dry3%
Absorbency2%