Is vitamin d and magnesium supplement profitable to sell on Amazon United States?

The niche generates $54K/yr across 25 tracked products. 4 of 5 products launched in the last 360 days are still selling. 90-day search growth is -7.1%. Flapen's verdict: Skip it (47/100).

How competitive is the vitamin d and magnesium supplement niche?

22 brands and 111 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 60% of demand.

What do buyers complain about in vitamin d and magnesium supplement?

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

When does demand for vitamin d and magnesium supplement peak?

Demand peaks in Aug–Sep–Oct–Nov–Dec; the busiest month runs 2.8× the quietest.

What does it cost to enter the vitamin d and magnesium supplement niche?

Listings span $5.33–$36.63; the average listing price is $17.98 (sweet spot $15–$100). The average incumbent carries 4,181 reviews — the moat a new listing must climb.

vitamin d and magnesium supplement

Skip it

A small market ($54K/yr) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Great$17.98

avg listing price — sweet spot $15–$100

Brand share

Great60%

top-5 brand share — no brand owns this niche

Price range

Good$5.33–$36.63

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

Competition

Good51%

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

Conversion

Okay3.6%

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

Review moat

Bad4,180.6

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Growth

Bad-7.1%

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

Market size

Bad$54K

$54K/yr · 83K searches

According to Flapen's Amazon United States niche tracking, vitamin d and magnesium supplement is a $54K/yr Amazon United States market (83K searches/yr). The top 5 brands hold 60% of demand. Demand peaks in Aug–Sep–Oct–Nov–Dec. Verdict: Skip it — 47/100.

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

vitamin d and magnesium supplement market data

Units sold / yr: 4K–5K; avg 100–250/product
Revenue / yr: $72K–$90K; units × avg price
Conversion rate: 3.6%
Avg BSR: #272
Page quality: 0%
Prime: 100%
Sponsored: 96%
Out of stock: 0.0%
Avg brand age: 59 months
Avg seller age: 153 days

Competition & brand share

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

Brands

22 rising

Sellers

111

Top-5 brand share

60%

Top 20: 98%

Top-5 click share

51%

Top 20: 95%

Open market

34%

Nature Made25%
Nature's Bounty13%
Bronson8%
Totaria7%
Carlyle7%
Live Conscious6%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -7.1% search growth over the last 90 days.

Peak months: Aug, Sep, Oct, Nov, Dec · busiest ÷ quietest = 2.8×

Open Trend

Top vitamin d and magnesium supplement search terms

magnesium vitamin d21K/yr -9.1%3.7% conv.
magnesium and vitamin d20K/yr -4.8%3.4% conv.
vitamin d magnesium17K/yr -0.8%2.8% conv.
magnesium with vitamin d11K/yr +13.0%2.7% conv.
omega 3 magnesium vitamin d zinc5K/yr -26.2%1.8% conv.
magnesium d37K/yr -29.5%5.7% conv.
magnesium vitamin d32K/yr -28.2%2.3% conv.

All search terms

Top vitamin d and magnesium 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

Nature Made Magnesium Complex Supplement with Vitamin D & Zinc 60 Capsules

Nature Made$14.894.7★3,879 rev

Natures Bounty Advanced Vitamin D3 with Magnesium Citrate Immune Formula Supports Immune and Bone Health 90 Tablets

Nature's Bounty$8.974.7★1,096 rev

Bronson Vitamin K2+D3 Magnesium Glycinate Supplement 60 Capsules

Bronson$9.364.6★155 rev

9-in-1 Magnesium Glycinate 500mg + Vitamin D3 5000 IU & K2 Complex - High Absorption - Healthy Stress Sleep Muscle Function Bone Health & Energy Supports | Non-GMO Gluten-Free 120 Softgels

Totaria$19.774.6★441 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

Newest

by launch date

Magnesium Complex for Women & Men 500mg (7-in-1) Magnesium Glycinate with Vegan D3 B6 and Manganese (Made In USA) + Gluconate Citrate Malate Taurate Orotate Carbonate (Oxide-Free) Small Capsule

Etta Vita$26.28402 rev

4mo ago

Bronson Vitamin K2+D3 Magnesium Glycinate Supplement 60 Capsules

Bronson$9.36155 rev

5mo ago

NatureWise Magnesium Glycinate 550mg + High-Dose 10000 IU Vitamin D3 K2 100 mcg - D3 K2 Magnesium Supplement - Chelated for High Absorption - Bone Support - Non-GMO USA Manufactured - [30-Day Supply]

NatureWise$14.35128 rev

9mo ago

YMINGKJ Vitamin D3 K2 5000 IU Softgels with Magnesium Supplement - & 120mcg MK-7 K2 for Bone Health & Immune Support - Non-GMO & Gluten-Free Softgels with MCT Oil- 30 Softgel

YMINGKJ$9.46265 rev

11mo ago

9-in-1 Magnesium Glycinate 500mg + Vitamin D3 5000 IU & K2 Complex - High Absorption - Healthy Stress Sleep Muscle Function Bone Health & Energy Supports | Non-GMO Gluten-Free 120 Softgels

Totaria$19.77441 rev

11mo ago

What buyers say about vitamin d and magnesium supplement

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

What buyers love

Quality-Overall16%

“overall quality seems solid”

Vitamin15%

“Great Vitamin”

Sleep Quality8%

“Better sleep”

Magnesium7%

“Best Magnesium supplement”

Value For Money7%

“Great deal”

Ease Of Chewing/Swallowing6%

“Easy to swallow”

Advertised Vs Actual Product3%

“As described”

Ease Of Use3%

“Ease of use”

Taste-Overall3%

“no weird taste”

Efficiency2%

“Works well”

What buyers complain about

Dosage11%

“Dosage check not good”

Vitamin8%

“Wish it had Vitamin A also”

Size-Overall6%

“Its huge”

Value For Money6%

“Waste of money”

Magnesium5%

“They have a relatively low dose of magnesium”

Smell3%

“This one has some odor”

Ease Of Chewing/Swallowing3%

“would be a concern for anyone who has difficulty swallowing”

Functionality-Overall3%

“Did not help”

Sleep Quality3%

“it doesnt make me sleepy like I thought”

Taste-Overall2%

“taste was foul”

Top return reasons

Magnesium22%

Vitamin13%

Functionality-Overall13%

Dosage9%

Certifications9%

Solubility7%

Hard Feel7%

Calcium4%

Heart Health4%

Joint Pain4%

Common questions

Is vitamin d and magnesium supplement profitable to sell on Amazon United States?: The niche generates $54K/yr across 25 tracked products. 4 of 5 products launched in the last 360 days are still selling. 90-day search growth is -7.1%. Flapen's verdict: Skip it (47/100).
How competitive is the vitamin d and magnesium supplement niche?: 22 brands and 111 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 60% of demand.
What do buyers complain about in vitamin d and magnesium supplement?: Top complaints mined from reviews: Dosage, Vitamin, Size-Overall. The return rate is 0.0%.
When does demand for vitamin d and magnesium supplement peak?: Demand peaks in Aug–Sep–Oct–Nov–Dec; the busiest month runs 2.8× the quietest.
What does it cost to enter the vitamin d and magnesium supplement niche?: Listings span $5.33–$36.63; the average listing price is $17.98 (sweet spot $15–$100). The average incumbent carries 4,181 reviews — the moat a new listing must climb.