Is magnesium inositol profitable to sell on Amazon United States?

The niche generates $51K/yr across 10 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -28.6%. Flapen's verdict: Skip it (41/100).

How competitive is the magnesium inositol niche?

10 brands and 17 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 86% of demand.

What do buyers complain about in magnesium inositol?

Top complaints mined from reviews: Smell, Taste-Overall, Ingredients-Overall. The return rate is 0.0%.

When does demand for magnesium inositol peak?

Demand peaks in Mar–Jul–Sep; the busiest month runs 2.2× the quietest.

What does it cost to enter the magnesium inositol niche?

Listings span $9.91–$51.47; the average listing price is $22.78 (sweet spot $15–$100). The average incumbent carries 819 reviews — the moat a new listing must climb.

Magnesium Inositol

Skip it

Soft demand (-28.6% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$22.78

avg listing price — sweet spot $15–$100

Price range

Great$9.91–$51.47

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

Review moat

Good818.7

avg incumbent reviews — the moat a new listing must climb

Conversion

Good5.5%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay86%

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

Market size

Bad$51K

$51K/yr · 41K searches

Competition

Bad86%

top-5 click share — a locked-up shelf

Growth

Bad-28.6%

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

Is magnesium inositol profitable on Amazon?

According to Flapen's Amazon United States niche tracking, magnesium inositol is a $51K/yr Amazon United States market (41K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Mar–Jul–Sep. Verdict: Skip it — 41/100.

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

magnesium inositol market size & sales

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

Units sold / yr: 2K–2K; avg 100–250/product
Revenue / yr: $34K–$46K; units × avg price
Conversion rate: 5.5%
Avg BSR: #715
Page quality: 0%
Prime: 100%
Sponsored: 70%
Out of stock: 7.7%
Avg brand age: 54 months
Avg seller age: 164 days

Competition: brands, sellers & click share

The top 5 products capture 86% of clicks — a locked-up shelf that new listings rarely crack.

Brands

10 rising

Sellers

Top-5 brand share

86%

Top 20: 100%

Top-5 click share

86%

Top 20: 100%

Open market

10%

NOW Foods42%
Jarrow Formulas24%
Nobi Nutrition9%
Nutricost7%
Life Extension4%
MEDCHOICE3%
Open — no brand owns it (4 brands, 10%)

magnesium inositol demand & seasonality

Weekly Amazon search volume, last 100 weeks — -28.6% search growth over the last 90 days.

Peak months: Mar, Jul, Sep · busiest ÷ quietest = 2.2×

Open Trend

Top magnesium inositol search terms shoppers use

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

magnesium inositol23K/yr -46.4%3.6% conv.
magnesio inositol10K/yr -3.0%2.3% conv.
jarrow inositol3K/yr +26.3%9.4% conv.
jarrow inositol powder3K/yr +39.3%2.2% conv.
inositol jarrow2K/yr +31.4%11.0% conv.
inositol magnesium glycine supplement564/yr -9.5%0.0% conv.
magnesium inositol relax now330/yr +11.6%18.8% conv.

All search terms

Top magnesium inositol 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 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NOW Foods Supplements powder Magnesium Inositol Relax Nervous System Support* Fizzy Lemonade Flavor 16-Ounce

NOW Foods$18.434.6★550 rev

Jarrow Formulas Inositol 750 mg Dietary Supplement Liver Support for Cellular Health and General Wellness 100 Veggie Capsules Up to a 100 Day Supply

Jarrow Formulas$13.964.6★1,945 rev

Complete Sleep Support Myo Inositol + Magnesium Glycinate 1100MG Complex

Nobi Nutrition$15.584.3★49 rev

Nutricost Inositol Capsules 500mg 240 Capsules (Myo-Inositol) GMO-Free

Nutricost$16.604.7★861 rev

Life Extension Inositol Caps 1000 mg Myo-Inositol Mood Health Well-Being Healthy Metabolism Hormone Balance Gluten-Free Non-GMO Vegetarian 360 Capsules

Life Extension$39.004.7★792 rev

Newest

by launch date

Myo-Inositol & D-Chiro Inositol Gummies for Women & Glp-1 Users 40:1 Ratio with Magnesium Ashwagandha Vitamin B6 B12 & Methylfolate Hormone Balance Mood Calm Sleep & Metabolic Sugar Free 60ct

EnvyCure$27.8736 rev

7mo ago

Myo Inositol D Chiro Inositol Supplement for Women - Hormone Balance with Magnesium Ashwagandha Vitamin D3 Folate Maca Root Chasteberry Evening Primrose | Ovarian Support Capsules 120 Count

Clean Nutraceuticals$11.21102 rev

10mo ago

Complete Sleep Support Myo Inositol + Magnesium Glycinate 1100MG Complex

Nobi Nutrition$15.5849 rev

11mo ago

14-in-1 Womens Inositol Complex Supplement 40:1 Myo & D-Chiro Inositol with Folate Vitamin D3 Zinc Magnesium & Botanicals for Hormone & Feminine Wellness Support (120 Capsules) (Pack of 1)

MEDCHOICE$23.73980 rev

2y ago

Inositol Capsules (Myo Inositol) 1000mg Health Support for Women (60 Count)(No Fillers Vegan Safe Gluten Free) by Double Wood

Double Wood Supplements$9.911,968 rev

2y ago

What reviews say buyers love and hate about magnesium inositol

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

What buyers love

Quality-Overall13%

“looks to be good quality”

Hormonal Balance9%

“help with hormonal acne”

Sleep Quality6%

“Better sleep”

Vitamin4%

“Good supplement”

Efficiency4%

“Works well”

Side Effects4%

“The product and effects are great”

Taste-Overall4%

“These gummies taste good”

Energy Level3%

“Helps with my energy”

Value For Money3%

“Worth every penny”

Ease Of Chewing/Swallowing3%

“Easy to swallow”

What buyers complain about

Smell7%

“When I opened the bottle it smells like berry”

Taste-Overall7%

“to strong in taste”

Ingredients-Overall6%

“I dont trust the ingredients”

Functionality-Overall5%

“These just don't work”

Vitamin4%

“the difference in feeling from my last vitamin complex pill compared to this one does not justify having to put up with the smell”

Dosage4%

“Did not notice any difference taking this medicine”

Value For Money4%

“Not worth it”

Sleep Quality4%

“she had difficulty getting back to sleep”

Side Effects4%

“even at a low dosage made me sick”

Stress/Anxiety3%

“Did not work for me—caused anxiety and breakouts”

Top return reasons

Vitamin50%

Ingredients-Overall50%

Common magnesium inositol questions

Is magnesium inositol profitable to sell on Amazon United States?: The niche generates $51K/yr across 10 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -28.6%. Flapen's verdict: Skip it (41/100).
How competitive is the magnesium inositol niche?: 10 brands and 17 sellers compete. The top 5 products take 86% of clicks and top 5 brands hold 86% of demand.
What do buyers complain about in magnesium inositol?: Top complaints mined from reviews: Smell, Taste-Overall, Ingredients-Overall. The return rate is 0.0%.
When does demand for magnesium inositol peak?: Demand peaks in Mar–Jul–Sep; the busiest month runs 2.2× the quietest.
What does it cost to enter the magnesium inositol niche?: Listings span $9.91–$51.47; the average listing price is $22.78 (sweet spot $15–$100). The average incumbent carries 819 reviews — the moat a new listing must climb.