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

The niche generates $335K/yr across 15 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is +5.0%. Flapen's verdict: Skip it (47/100).

How competitive is the vitamin d and magnesium niche?

11 brands and 84 sellers compete. The top 5 products take 74% of clicks and top 5 brands hold 87% of demand.

What do buyers complain about in vitamin d and magnesium?

Top complaints mined from reviews: Dosage, Size-Overall, Durability. The return rate is 0.3%.

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

Listings span $8.97–$42.94; the average listing price is $17.76 (sweet spot $15–$100). The average incumbent carries 5,102 reviews — the moat a new listing must climb.

vitamin d and magnesium

Skip it

A concentrated shelf (top 5 take 74% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.3%

return rate — above 5% kills the launch gate

Avg price

Great$17.76

avg listing price — sweet spot $15–$100

Price range

Great$8.97–$42.94

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

Conversion

Good6.6%

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

Market size

Good$335K

$335K/yr · 286K searches

Growth

Okay+5.0%

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

Brand share

Okay87%

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

Review moat

Bad5,101.93

avg incumbent reviews — the moat a new listing must climb

Competition

Bad74%

top-5 click share — a locked-up shelf

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

According to Flapen's Amazon United States niche tracking, vitamin d and magnesium is a $335K/yr Amazon United States market (286K searches/yr). The top 5 brands hold 87% of demand. Verdict: Skip it — 47/100.

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

vitamin d and magnesium market data

Units sold / yr: 25K–30K; avg 2,500–3,000/product
Revenue / yr: $444K–$533K; units × avg price
Conversion rate: 6.6%
Avg BSR: #223
Page quality: 0%
Prime: 100%
Sponsored: 93%
Out of stock: 0.0%
Avg brand age: 55 months
Avg seller age: 151 days

Competition & brand share

The top 5 products capture 74% of clicks — a locked-up shelf that new listings rarely crack.

Brands

11 rising

Sellers

Top-5 brand share

87%

Top 20: 100%

Top-5 click share

74%

Top 20: 100%

Open market

10%

Live Conscious37%
Nature Made37%
Nature's Bounty5%
Bronson4%
Totaria4%
Carlyle3%
Open — no brand owns it (5 brands, 10%)

Demand

Weekly Amazon search volume, last 29 weeks — +5.0% search growth over the last 90 days.

Open Trend

Top vitamin d and magnesium search terms

magwell48K/yr -6.6%11.9% conv.
nature made magnesium complex34K/yr +16.6%7.0% conv.
vitamin d and magnesium22K/yr -8.0%2.8% conv.
magnesium vitamin d21K/yr -9.1%2.8% conv.
magnesium and vitamin d20K/yr -4.8%2.8% conv.
vitamin d magnesium17K/yr -0.8%2.1% conv.
magwell magnesium with zinc & d321K/yr -16.5%17.4% conv.
magnesium complex nature made12K/yr +48.0%6.6% conv.
vitamin d with magnesium14K/yr +3.6%2.1% conv.
magnesium with vitamin d11K/yr +13.0%2.0% conv.

All search terms

Top vitamin d and 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 15 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Live Conscious Magwell Magnesium Zinc & Vitamin D3 - Magnesium Glycinate Malate & Citrate - Triple Supplement for Women & Men - for Sleep Bone Heart Immune Support - 120 Caps

Live Conscious$23.134.6★17,083 rev

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

Nature Made$14.894.7★3,879 rev

Nature Made High Absorption Magnesium Complex Soft Chews 40 Count

Nature Made$15.114.6★568 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

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

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

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

Magnesium Zinc & Vitamin D3 260mg Complex High Absorption 60 Capsules

Nobi Nutrition$15.7878 rev

1y ago

VEV Corefeel Vitamin D3 K2 10 000 IU Magnesium Supplement 300 Softgels

VEV$21.342,552 rev

1y ago

What buyers say about vitamin d and magnesium

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

What buyers love

Quality-Overall16%

“EXCELLENT PRODUCT”

Vitamin11%

“Quality Vitamin”

Sleep Quality10%

“Better sleep”

Magnesium9%

“Best magnesium we've found”

Ease Of Chewing/Swallowing7%

“Easy to swallow”

Value For Money6%

“Good value for the money”

Advertised Vs Actual Product3%

“Working as stated”

Ease Of Use3%

“Very convenient for everyday use”

Muscle Pain Relief2%

“it helps me with muscle pain”

Energy Level2%

“Help your energy”

What buyers complain about

Dosage12%

“Dosage check not good”

Size-Overall7%

“Large Capsules”

Durability6%

“This only lasted a couple months”

Magnesium5%

“Ineffective Magnesium Supplement”

Vitamin4%

“Wish it had Vitamin A also”

Value For Money4%

“Waste of money”

Sleep Quality3%

“it doesnt make me sleepy like I thought”

Taste-Overall3%

“tastes gross”

Quality-Overall3%

“Looks cheap”

Functionality-Overall2%

“To me that's just not functional”

Top return reasons

Size-Overall30%

Magnetic Strength/Adsorption22%

Advertised Vs Actual Product8%

Functionality-Overall6%

Compatibility-Overall4%

Ease Of Use4%

Adhesion/Stickiness4%

Color3%

Weight Heavy3%