Is calcium magnesium profitable to sell on Amazon United States?

The niche generates $601K/yr across 27 tracked products. 90-day search growth is +9.0%. Flapen's verdict: Worth a look (57/100).

How competitive is the calcium magnesium niche?

15 brands and 591 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 72% of demand.

What do buyers complain about in calcium magnesium?

Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Dosage. The return rate is 0.0%.

When does demand for calcium magnesium peak?

Demand is steady year-round — the busiest month runs 1.1× the quietest.

What does it cost to enter the calcium magnesium niche?

Listings span $5.32–$41.30; the average listing price is $22.31 (sweet spot $15–$100). The average incumbent carries 4,588 reviews — the moat a new listing must climb.

calcium magnesium

Worth a look

Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$22.31

avg listing price — sweet spot $15–$100

Conversion

Good7.0%

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

Price range

Good$5.32–$41.30

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

Market size

Good$601K

$601K/yr · 387K searches

Brand share

Good72%

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

Competition

Good54%

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

Growth

Okay+9.0%

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

Review moat

Bad4,587.74

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, calcium magnesium is a $601K/yr Amazon United States market (387K searches/yr). The top 5 brands hold 72% of demand. Verdict: Worth a look — 57/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

calcium magnesium market data

Units sold / yr: 30K–40K; avg 750–1,000/product
Revenue / yr: $669K–$892K; units × avg price
Conversion rate: 7.0%
Avg BSR: #397
Page quality: 0%
Prime: 100%
Sponsored: 78%
Out of stock: 1.3%
Avg brand age: 80 months
Avg seller age: 155 days

Competition & brand share

The top 5 products take 54% of clicks — established leaders, but buyers still shop beyond them.

Brands

15 falling

Sellers

591

Top-5 brand share

72%

Top 20: 100%

Top-5 click share

54%

Top 20: 93%

Open market

21%

NOW Foods25%
Nature Made16%
Country Life14%
Nature's Bounty11%
SOLARAY7%
Pure Encapsulations6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +9.0% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.1×

Open Trend

Top calcium magnesium search terms

calcium magnesium109K/yr +4.7%8.0% conv.
calcium and magnesium supplement41K/yr +2.7%7.2% conv.
calcium magnesium supplement54K/yr -21.5%6.4% conv.
magnesium calcium32K/yr +2.5%6.5% conv.
calcium and magnesium20K/yr +21.7%4.3% conv.
magnesium and calcium supplement19K/yr +7.3%5.3% conv.
calcium magnesium d315K/yr +28.2%3.5% conv.
calcium with magnesium14K/yr +24.3%4.5% conv.
cal mag supplement13K/yr +21.6%5.1% conv.
magnesium calcium supplement10K/yr -1.2%3.2% conv.

All search terms

Top calcium magnesium products on Amazon

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

NOW Foods Supplements Calcium & Magnesium 2:1 Ratio High Potency Supports Bone Health* 250 Tablets

NOW Foods$17.824.6★6,212 rev

Nature Made Calcium Magnesium Zinc with Vitamin D3 Dietary Calcium Supplement for Bone Support 300 Tablets

Nature Made$11.084.8★20,058 rev

Natures Bounty Calcium Magnesium & Zinc Caplets Immune & Bone Health Daily Supplement 1000mg Calcium 400mg Magnesium 600 IU Vitamin D Gluten Free 100 Caplets

Nature's Bounty$5.324.7★23,123 rev

NOW Foods Supplements Calcium & Magnesium with Vitamin D-3 and Zinc Supports Bone Health* 120 Softgels

NOW Foods$10.544.6★3,002 rev

Pure Encapsulations Calcium Magnesium (Citrate) - 240 g Calcium & 240 g Magnesium - Bone Health Support* - Non-GMO & Vegan - 180 Capsules

Pure Encapsulations$32.824.7★1,101 rev

Newest

by launch date

Nutricost Calcium Magnesium & Zinc Tablets 1 415 mg 180 Tablets - Vitamin/Mineral Blend Supplement 60 Servings - Gluten Free Non-GMO

Nutricost$13.87568 rev

3y ago

Qunol Calcium 3 in 1 Tablets with Calcium Magnesium & Zinc for Immune Support Bone Nerve and Muscle Health Supplement 270 Count

Qunol$18.153,224 rev

3y ago

Nutricost Calcium & Magnesium Carbonate 240 Tablets 60 Servings GMO-Free

Nutricost$14.81297 rev

5y ago

SOLARAY Calcium Magnesium Zinc Supplement - with Calcium 1000mg Magnesium 500mg - Bone Health Muscle Function Heart Health and Immune Support - Vegan 60 Day Guarantee 68 Servings 275 VegCaps

SOLARAY$23.605,860 rev

7y ago

THORNE - Calcium-Magnesium Malate - Optimally Absorbed Magnesium & Calcium Mineral Supplement - Supports Bone Muscle Lung & Heart Health* - Third-Party Certified - Dairy & Gluten-Free - 240 Capsules

THORNE$41.30878 rev

8y ago

What buyers say about calcium magnesium

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

What buyers love

Quality-Overall22%

“Great product will reorder”

Vitamin13%

“Good source of vitamins”

Value For Money9%

“Good deal”

Calcium9%

“A Good Calcium”

Ease Of Chewing/Swallowing5%

“This is the best for me because easy swallowing”

Advertised Vs Actual Product4%

“As advertised”

Ease Of Use2%

“Easy to use and taste ok”

Sleep Quality2%

“SLEEP is fantastic”

Joint Pain2%

“Very good for fibromyalgia and osteoporosis”

Efficiency2%

“Seems like it help”

What buyers complain about

Size-Overall14%

“The tablets are a bit large”

Ease Of Chewing/Swallowing11%

“Impossible to swallow”

Dosage7%

“Content of each is very low per dosage compared to other brands at the same cost”

Calcium6%

“1,000 mg calcium in 2 mL is extremely concentrated”

Magnesium5%

“Worst 2 forms of magnesium”

Quality-Overall5%

“Very bad batch here”

Value For Money4%

“Overpriced”

Vitamin3%

“I cant take theses huge vitamins”

Taste-Overall3%

“They don't taste great”

Functionality-Overall2%

“Product does not work”

Top return reasons

Calcium23%

Magnesium15%

Value For Money15%

Material Quality8%

Regulates Digestion8%

Vitamin8%

Ingredients-Overall8%

Dosage8%

Advertised Vs Actual Product8%

Common questions

Is calcium magnesium profitable to sell on Amazon United States?: The niche generates $601K/yr across 27 tracked products. 90-day search growth is +9.0%. Flapen's verdict: Worth a look (57/100).
How competitive is the calcium magnesium niche?: 15 brands and 591 sellers compete. The top 5 products take 54% of clicks and top 5 brands hold 72% of demand.
What do buyers complain about in calcium magnesium?: Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Dosage. The return rate is 0.0%.
When does demand for calcium magnesium peak?: Demand is steady year-round — the busiest month runs 1.1× the quietest.
What does it cost to enter the calcium magnesium niche?: Listings span $5.32–$41.30; the average listing price is $22.31 (sweet spot $15–$100). The average incumbent carries 4,588 reviews — the moat a new listing must climb.