Is cal mag supplement profitable to sell on Amazon United States?

The niche generates $38K/yr across 30 tracked products. 90-day search growth is +14.2%. Flapen's verdict: Worth a look (54/100).

How competitive is the cal mag supplement niche?

17 brands and 626 sellers compete. The top 5 products take 48% of clicks and top 5 brands hold 68% of demand.

What do buyers complain about in cal mag supplement?

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

When does demand for cal mag supplement peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the cal mag supplement niche?

Listings span $5.33–$51.04; the average listing price is $22.49 (sweet spot $15–$100). The average incumbent carries 3,924 reviews — the moat a new listing must climb.

cal mag supplement

Worth a look

Shows low returns (0.0%), but a small market ($38K/yr) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$22.49

avg listing price — sweet spot $15–$100

Conversion

Great8.4%

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

Price range

Great$5.33–$51.04

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

Competition

Good48%

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

Brand share

Good68%

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

Growth

Okay+14.2%

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

Review moat

Okay3,923.87

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Market size

Bad$38K

$38K/yr · 20K searches

According to Flapen's Amazon United States niche tracking, cal mag supplement is a $38K/yr Amazon United States market (20K searches/yr). The top 5 brands hold 68% of demand. Verdict: Worth a look — 54/100.

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

cal mag supplement market data

Units sold / yr: 2K–2K; avg 0–100/product
Revenue / yr: $34K–$45K; units × avg price
Conversion rate: 8.4%
Avg BSR: #394
Page quality: 0%
Prime: 97%
Sponsored: 80%
Out of stock: 5.0%
Avg brand age: 125 months
Avg seller age: 160 days

Competition & brand share

The top 5 products take 48% of clicks — established leaders, but buyers still shop beyond them.

Brands

17 rising

Sellers

626

Top-5 brand share

68%

Top 20: 100%

Top-5 click share

48%

Top 20: 90%

Open market

26%

NOW Foods31%
SOLARAY11%
Pure Encapsulations11%
Nature Made8%
365 by Whole Foods Market7%
Country Life6%

Demand & seasonality

Weekly Amazon search volume, last 103 weeks — +14.2% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top cal mag supplement search terms

cal mag supplement13K/yr +22.4%6.9% conv.
calmag supplement5K/yr -3.5%6.9% conv.
cal-mag supplement2K/yr +11.3%6.1% conv.

All search terms

Top cal mag supplement 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$17.854.6★6,215 rev

NOW Supplements Cal-Mag Caps with Vitamin D and Supporting Minerals Supports Bone Health* 240 Veg Capsules

NOW Foods$19.534.8★546 rev

Pure Encapsulations Cal/Mag (Malate) 2:1 - Calcium & Magnesium (Malate) - Bone Health Supplement* - Optimal Absorption - Vegan & Gluten Free - 180 Capsules

Pure Encapsulations$36.954.7★541 rev

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

Nature Made$11.134.8★20,083 rev

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$23.644.7★5,864 rev

Newest

by launch date

Qunol Calcium Magnesium Zinc 3-in-1 Tablet Immune System Support 270ct

Qunol$18.103,832 rev

3y ago

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

Nutricost$14.80298 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$23.645,864 rev

7y ago

CalMag Plus Calcium Magnesium Powder for Sleep & Calm Orange Flavor

Whole Family Naturals$27.15383 rev

8y ago

CalMag Plus Calcium Magnesium Powder for Calm Sleep & Muscle Support

Whole Family Naturals$27.101,157 rev

8y ago

What buyers say about cal mag supplement

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

What buyers love

Quality-Overall22%

“Reliable quality and consistent results”

Vitamin12%

“Best vitamins ever”

Value For Money10%

“Great value”

Ease Of Chewing/Swallowing5%

“This is the best for me because easy swallowing”

Calcium5%

“A Good Calcium”

Magnesium3%

“It improved my magnesium levels tremendously”

Plant Growth3%

“Great all around plant nutrient that helps plants stay green and healthy”

Joint Pain3%

“Very good for fibromyalgia and osteoporosis”

Sleep Quality3%

“They help me sleep”

Advertised Vs Actual Product3%

“As advertised”

What buyers complain about

Size-Overall13%

“Very large”

Dosage8%

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

Ease Of Chewing/Swallowing8%

“Wasnt swallow”

Calcium6%

“It is not 100% Calcium Citrate”

Magnesium4%

“The doctor found my magnesium was low”

Vitamin4%

“I cant take theses huge vitamins”

Quality-Overall3%

“Very bad batch here”

Functionality-Overall3%

“Didnt work for me”

Absorbency3%

“but also not easily absorbable by humans”

Value For Money2%

“It's REALLY expensive”

Top return reasons

Leak-Proof24%

Value For Money19%

Advertised Vs Actual Product15%

Size-Overall7%

Functionality-Overall6%

Defective Material/Parts4%