Is magnesium citrate 100mg profitable to sell on Amazon United States?

The niche generates $42K/yr across 19 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +21.0%. Flapen's verdict: Skip it (47/100).

How competitive is the magnesium citrate 100mg niche?

13 brands and 138 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 79% of demand.

What do buyers complain about in magnesium citrate 100mg?

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

When does demand for magnesium citrate 100mg peak?

Demand is steady year-round — the busiest month runs 1.5× the quietest.

What does it cost to enter the magnesium citrate 100mg niche?

Listings span $4.92–$33.48; the average listing price is $16.04 (sweet spot $15–$100). The average incumbent carries 8,584 reviews — the moat a new listing must climb.

Magnesium Citrate 100mg

Skip it

A small market ($42K/yr) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$16.04

avg listing price — sweet spot $15–$100

Conversion

Good6.9%

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

Price range

Good$4.92–$33.48

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

Growth

Good+21.0%

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

Brand share

Okay79%

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

Competition

Okay66%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Review moat

Bad8,584.21

avg incumbent reviews — the moat a new listing must climb

Market size

Bad$42K

$42K/yr · 38K searches

Is magnesium citrate 100mg profitable on Amazon?

According to Flapen's Amazon United States niche tracking, magnesium citrate 100mg is a $42K/yr Amazon United States market (38K searches/yr). The top 5 brands hold 79% of demand. Verdict: Skip it — 47/100.

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

magnesium citrate 100mg market size & sales

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

Units sold / yr: 3K–4K; avg 100–250/product
Revenue / yr: $48K–$64K; units × avg price
Conversion rate: 6.9%
Avg BSR: #970
Page quality: 0%
Prime: 89%
Sponsored: 63%
Out of stock: 4.0%
Avg brand age: 85 months
Avg seller age: 157 days

Competition: brands, sellers & click share

The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 flat

Sellers

138

Top-5 brand share

79%

Top 20: 100%

Top-5 click share

66%

Top 20: 100%

Open market

16%

Life Extension32%
NOW Foods15%
Pure Encapsulations14%
Spring Valley12%
Nature Made6%
Nature's Bounty5%
Open — no brand owns it (7 brands, 16%)

magnesium citrate 100mg demand & seasonality

Weekly Amazon search volume, last 99 weeks — +21.0% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.5×

Open Trend

Top magnesium citrate 100mg search terms shoppers use

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

magnesium citrate 100mg17K/yr +9.6%6.8% conv.
magnesium citrate 150 mg7K/yr +41.2%4.3% conv.
magnesium citrate 150mg5K/yr +95.1%1.4% conv.
magnesium citrate 100 mg5K/yr +1.3%10.9% conv.
spring valley magnesium citrate5K/yr +3.5%7.9% conv.

All search terms

Top magnesium citrate 100mg 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 19 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Life Extension Magnesium Citrate 100 mg Vegetarian Capsules Blue 100 Count

Life Extension$7.174.7★3,424 rev

NOW Supplements Magnesium Citrate Enzyme Function* Nervous System Support* 120 Veg Capsules

NOW Foods$9.974.7★25,502 rev

Spring Valley - Magnesium Citrate 100 mg Rapid-Release 100 Capsules

Spring Valley$14.614.6★668 rev

Life Extension Magnesium Citrate 100mg 180 Vegetarian Capsules

Life Extension$20.004.7★3,424 rev

Pure Encapsulations Magnesium (Citrate) - Supplement for Sleep Heart Health Cognitive Health Bone Health Energy Muscles and Metabolism* - with Premium Magnesium - 90 Capsules

Pure Encapsulations$19.704.7★13,790 rev

Newest

by launch date

Amazon Basics Magnesium Citrate Rapid Release Capsules 100 mg 60 Count

Amazon Basics$4.9229 rev

1mo ago

Natures Bounty Magnesium Citrate High Absorption Magnesium Supplement for Whole Body Health with 150 mg Magnesium Vegetarian Gluten Free 90 Capsules

Nature's Bounty$16.0381 rev

10mo ago

Arofum Magnesium Citrate Capsules for Constipation & Sleep Support - Vegan Magnesium Citrate Supplement with Vitamin B6 & L-Theanine for High Absorption - 120 Capsules Non-GMO

Arofum$12.7278 rev

11mo ago

Spring Valley Extra Strength Magnesium Gummies for Bone and Muscle Health 250mg 60ct + Sticker.

Generic$25.9831 rev

1y ago

Now Supplements Magnesium Citrate Enzyme Function* 60 Veg Caps

NOW Foods$6.86251 rev

1y ago

What reviews say buyers love and hate about magnesium citrate 100mg

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

What buyers love

Quality-Overall20%

“It is well-made”

Magnesium11%

“Best magnesium ever”

Sleep Quality9%

“Helps me sleep”

Regulates Digestion5%

“easy to digest”

Vitamin5%

“Good supplements”

Efficiency5%

“Effective if taken as intended”

Value For Money4%

“Worth the money”

Advertised Vs Actual Product4%

“It works as advertised”

Ease Of Chewing/Swallowing4%

“is not a problem to swallow”

Muscle Pain Relief3%

“Relax your muscles”

What buyers complain about

Size-Overall19%

“Too big”

Magnesium8%

“Not as good as Magnesium Glycinate”

Dosage5%

“Maybe I need a different dose”

Ease Of Chewing/Swallowing4%

“Too big for me to swallow”

Regulates Digestion4%

“I have major digestive issues”

Functionality-Overall4%

“Not effective enough”

Quality-Overall4%

“Very poor quality”

Sleep Quality3%

“Does not help with sleep”

Taste-Overall3%

“leave a bad aftertaste”

Smell3%

“Smell so terrible”

Top return reasons

Magnesium55%

Functionality-Overall9%

Advertised Vs Actual Product8%

Ease Of Chewing/Swallowing8%

Size-Overall6%

Quality-Overall3%

Ingredients-Overall3%

Product Condition3%

Dosage3%

Ease Of Use3%

Common magnesium citrate 100mg questions

Is magnesium citrate 100mg profitable to sell on Amazon United States?: The niche generates $42K/yr across 19 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is +21.0%. Flapen's verdict: Skip it (47/100).
How competitive is the magnesium citrate 100mg niche?: 13 brands and 138 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 79% of demand.
What do buyers complain about in magnesium citrate 100mg?: Top complaints mined from reviews: Size-Overall, Magnesium, Dosage. The return rate is 0.0%.
When does demand for magnesium citrate 100mg peak?: Demand is steady year-round — the busiest month runs 1.5× the quietest.
What does it cost to enter the magnesium citrate 100mg niche?: Listings span $4.92–$33.48; the average listing price is $16.04 (sweet spot $15–$100). The average incumbent carries 8,584 reviews — the moat a new listing must climb.