Is magnesium citrate 400mg profitable to sell on Amazon United States?

The niche generates $189K/yr across 24 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (51/100).

How competitive is the magnesium citrate 400mg niche?

17 brands and 641 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in magnesium citrate 400mg?

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

When does demand for magnesium citrate 400mg peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the magnesium citrate 400mg niche?

Listings span $7.77–$33.48; the average listing price is $15.96 (sweet spot $15–$100). The average incumbent carries 10,519 reviews — the moat a new listing must climb.

Magnesium Citrate 400mg

Worth a look

Shows low returns (0.0%), but a deep review moat (10,519 avg reviews) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Great8.3%

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

Avg price

Great$15.96

avg listing price — sweet spot $15–$100

Price range

Good$7.77–$33.48

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

Brand share

Good72%

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

Competition

Okay56%

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

Market size

Okay$189K

$189K/yr · 143K searches

Growth

Bad-1.8%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Review moat

Bad10,519

avg incumbent reviews — the moat a new listing must climb

Is magnesium citrate 400mg profitable on Amazon?

According to Flapen's Amazon United States niche tracking, magnesium citrate 400mg is a $189K/yr Amazon United States market (143K searches/yr). The top 5 brands hold 72% of demand. Verdict: Worth a look — 51/100.

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

magnesium citrate 400mg market size & sales

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

Units sold / yr: 15K–20K; avg 500–750/product
Revenue / yr: $239K–$319K; units × avg price
Conversion rate: 8.3%
Avg BSR: #362
Page quality: 0%
Prime: 100%
Sponsored: 75%
Out of stock: 0.0%
Avg brand age: 76 months
Avg seller age: 154 days

Competition: brands, sellers & click share

The top 5 products take 56% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 falling

Sellers

641

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

56%

Top 20: 96%

Open market

23%

SOLARAY24%
Nature Made17%
PhiNaturals16%
NOW Foods9%
Pure Encapsulations6%
DEAL SUPPLEMENT5%

magnesium citrate 400mg demand & seasonality

Weekly Amazon search volume, last 102 weeks — -1.8% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top magnesium citrate 400mg search terms shoppers use

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

magnesium citrate 400mg66K/yr -4.3%9.4% conv.
citrato de magnesio 400mg25K/yr +2.9%3.0% conv.
magnesium citrate 400 mg14K/yr +17.8%7.0% conv.
solaray magnesium citrate11K/yr -14.8%15.2% conv.
magnesium citrate 4006K/yr +68.1%6.4% conv.
magnesio citrato 400 mg4K/yr -17.0%3.9% conv.
magnesium citrate solaray4K/yr -20.8%16.3% conv.
solaray magnesium citrate 400mg3K/yr -6.4%24.8% conv.
magnesium citrate capsules 400mg3K/yr -22.2%9.8% conv.
magnesium citrate 400mg capsules3K/yr -24.6%8.7% conv.

All search terms

Top magnesium citrate 400mg 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

SOLARAY Magnesium Citrate 400mg - Magnesium Supplement - Bone Health Muscle Relaxation and Heart Health Support - Vegan Gluten Free - 60 Servings 180 VegCaps

SOLARAY$18.984.7★3,247 rev

Magnesium Citrate Powder Capsules 400mg - 180 Count Veg Caps - PhiNaturals Supplements - Nervous System Support and Enzyme Function

PhiNaturals$14.924.7★14,062 rev

Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets

Nature Made$13.294.4★75 rev

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

NOW Foods$9.974.7★25,502 rev

Magnesium Citrate 400mg Per Serving 300 Veggie Capsules Chelated Easily Absorbed Purified Trace Mineral Muscle Heart & Digestive Support Non-GMO

DEAL SUPPLEMENT$16.634.7★1,156 rev

Newest

by launch date

Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets

Nature Made$13.2975 rev

5mo ago

Vitamatic Magnesium Citrate 500mg per Serving - 180 Vegetarian Capsules (Provides 150 mg of Elemental Magnesium) - Added B6 for Maximum Absorption - Supports Muscle Joint and Heart Health*

Vitamatic$9.871,957 rev

2y ago

Magnesium Citrate 400mg Per Serving 300 Veggie Capsules Chelated Easily Absorbed Purified Trace Mineral Muscle Heart & Digestive Support Non-GMO

DEAL SUPPLEMENT$16.631,156 rev

3y ago

Brieofood Magnesium Citrate 400 mg (Elemental Mg) per Serving - 250 Tablets - Muscle Relaxation (Citrato de Magnesio)

Brieofood$10.12324 rev

3y ago

Magnesium Citrate 800mg 180 Capsules Digestion & Constipation Support Vegan Safe Non-GMO Double Wood Supplements

Double Wood Supplements$14.726,076 rev

4y ago

What reviews say buyers love and hate about magnesium citrate 400mg

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

What buyers love

Quality-Overall23%

“Excellent Quality”

Magnesium14%

“Best magnesium ever”

Sleep Quality9%

“Helps me sleep”

Value For Money5%

“Great Value for the Money”

Vitamin5%

“Excellent vitamin”

Advertised Vs Actual Product5%

“As described”

Efficiency5%

“Works Fast”

Regulates Digestion4%

“Does not upset my stomach or anything”

Muscle Pain Relief3%

“reduce muscle cramping”

Ease Of Chewing/Swallowing3%

“Easy to swallow”

What buyers complain about

Magnesium14%

“Magnesium deficiency”

Size-Overall13%

“Too big”

Dosage7%

“Misleading Dosage”

Functionality-Overall6%

“Not effective like another brand I use”

Advertised Vs Actual Product4%

“False advertising”

Ease Of Chewing/Swallowing4%

“Large, uncomfortable pill to swallow”

Regulates Digestion4%

“Does not help with digestion”

Quality-Overall3%

“it's a sign of bad quality control”

Sleep Quality3%

“Does not help with sleep”

Side Effects3%

“Harsh on stomach”

Top return reasons

Magnesium60%

Advertised Vs Actual Product9%

Dosage9%

Ease Of Chewing/Swallowing8%

Functionality-Overall7%

Size-Overall3%

Hard Feel2%

Ingredients-Overall2%

Common magnesium citrate 400mg questions

Is magnesium citrate 400mg profitable to sell on Amazon United States?: The niche generates $189K/yr across 24 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -1.8%. Flapen's verdict: Worth a look (51/100).
How competitive is the magnesium citrate 400mg niche?: 17 brands and 641 sellers compete. The top 5 products take 56% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in magnesium citrate 400mg?: Top complaints mined from reviews: Magnesium, Size-Overall, Dosage. The return rate is 0.0%.
When does demand for magnesium citrate 400mg peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the magnesium citrate 400mg niche?: Listings span $7.77–$33.48; the average listing price is $15.96 (sweet spot $15–$100). The average incumbent carries 10,519 reviews — the moat a new listing must climb.