Is magnesium supplements profitable to sell on Amazon United Kingdom?

The niche generates £4.8M/yr across 7 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -28.8%. Flapen's verdict: Skip it (44/100).

How competitive is the magnesium supplements niche?

7 brands and 35 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 93% of demand.

What do buyers complain about in magnesium supplements?

Top complaints mined from reviews: Sleep Quality, Magnesium, Functionality-Overall. The return rate is 0.1%.

When does demand for magnesium supplements peak?

Demand peaks in Jan; the busiest month runs 1.7× the quietest.

What does it cost to enter the magnesium supplements niche?

Listings span £3.44–£9.37; the average listing price is £6.94 (sweet spot $15–$100). The average incumbent carries 9,416 reviews — the moat a new listing must climb.

magnesium supplements

Skip it

Prices mostly outside the sweet spot ($3.44–$9.37) — this niche doesn't clear our bar today.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Market size

Incredible£4.8M

£4.8M/yr · 4.6M searches

Conversion

Incredible14.8%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Review moat

Bad9,415.86

avg incumbent reviews — the moat a new listing must climb

Avg price

Bad£6.94

avg listing price — sweet spot $15–$100

Brand share

Bad93%

top-5 brand share — brand-locked demand

Growth

Bad-28.8%

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

Competition

Bad93%

top-5 click share — a locked-up shelf

Price range

Bad£3.44–£9.37

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

According to Flapen's Amazon United Kingdom niche tracking, magnesium supplements is a £4.8M/yr Amazon United Kingdom market (4.6M searches/yr). The top 5 brands hold 93% of demand. Demand peaks in Jan. Verdict: Skip it — 44/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

magnesium supplements market data

Units sold / yr: 600K–800K; avg 100,000–125,000/product
Revenue / yr: £4.2M–£5.6M; units × avg price
Conversion rate: 14.8%
Avg BSR: #8
Page quality: 0%
Prime: 100%
Sponsored: 86%
Out of stock: 0.0%
Avg brand age: 46 months
Avg seller age: 161 days

Competition & brand share

The top 5 products capture 93% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

Top-5 brand share

93%

Top 20: 100%

Top-5 click share

93%

Top 20: 100%

Open market

Nutrition Geeks65%
Vitabiotics Ultra13%
Free Soul5%
Nutrivo5%
Zipvit5%
WeightWorld3%
Open — no brand owns it (1 brand, 3%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -28.8% search growth over the last 90 days.

Peak months: Jan · busiest ÷ quietest = 1.7×

Open Trend

Top magnesium supplements search terms

magnesium2.2M/yr -24.6%6.8% conv.
magnesium glycinate 3-in-1815K/yr -25.6%13.8% conv.
nutrition geeks magnesium306K/yr -32.9%22.1% conv.
magnesium supplements542K/yr -48.8%5.9% conv.
geeks magnesium glycinate 3-in-1196K/yr -26.8%22.3% conv.
magnesium tablets150K/yr -25.9%6.3% conv.
magnesium for sleep58K/yr -44.1%3.8% conv.
nutrition geeks magnesium 3 in 161K/yr -24.8%22.1% conv.
magnesium sleep48K/yr -37.2%2.7% conv.
glycinate 3 in 134K/yr -17.9%27.4% conv.

All search terms

Top magnesium supplements 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 7 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Magnesium Glycinate 3-in-1 Complex - 1800mg Supplements as Bisglycinate Citrate & Malate 90 Vegan Capsules Triple High Absorption 384mg Elemental UK Made

Nutrition Geeks£8.114.5★35,795 rev

Magnesium Supplements Tablets

Vitabiotics Ultra£3.444.6★5,535 rev

Free Soul£7.244.4★3,230 rev

Nutrivo£6.324.6★648 rev

Zipvit Magnesium 500mg of Elemental High-Strength Magnesium Supplement 3 Month Supply 90 Vegan Tablets Supports Muscle Bone & Energy

Zipvit£6.094.5★14,532 rev

Newest

by launch date

Nutrivo£6.32648 rev

9mo ago

Magnesium Glycinate 4-in-1 Complex - 400mg Elemental Mg - 180 Capsules

WeightWorld£9.373,717 rev

1y ago

Free Soul£7.243,230 rev

1y ago

VitaBright£8.012,454 rev

2y ago

Magnesium Glycinate 3-in-1 Complex - 1800mg Supplements as Bisglycinate Citrate & Malate 90 Vegan Capsules Triple High Absorption 384mg Elemental UK Made

Nutrition Geeks£8.1135,795 rev

3y ago

What buyers say about magnesium supplements

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

What buyers love

Sleep Quality25%

“Better sleep”

Quality-Overall15%

“the quality is always consistent”

Value For Money11%

“EXCELLENT VALUE FOR MONEY”

Magnesium11%

“best magnesium”

Advertised Vs Actual Product6%

“As Advertised”

Muscle Pain Relief4%

“helps muscle cramps”

Ease Of Chewing/Swallowing3%

“Easy to chew and tasty”

Efficiency3%

“Effective”

Vitamin3%

“Vitamins, easy to swallow good amount of supply”

Ease Of Use2%

“Easy to use”

What buyers complain about

Sleep Quality15%

“No sleep”

Magnesium9%

“It is not your ordinary magnesium”

Functionality-Overall7%

“Didn't do for me”

Dosage6%

“The dose is misleading”

Acid Regulator/Stomach Ache Relief6%

“Upsets my stomach”

Side Effects5%

“only negative effects”

Size-Overall5%

“they are huge”

Quality-Overall3%

“Absolutely rubbish”

Value For Money3%

“Expensive”

Advertised Vs Actual Product2%

“It's not as described”

Top return reasons

Magnesium50%

Joint Pain50%

Common questions

Is magnesium supplements profitable to sell on Amazon United Kingdom?: The niche generates £4.8M/yr across 7 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -28.8%. Flapen's verdict: Skip it (44/100).
How competitive is the magnesium supplements niche?: 7 brands and 35 sellers compete. The top 5 products take 93% of clicks and top 5 brands hold 93% of demand.
What do buyers complain about in magnesium supplements?: Top complaints mined from reviews: Sleep Quality, Magnesium, Functionality-Overall. The return rate is 0.1%.
When does demand for magnesium supplements peak?: Demand peaks in Jan; the busiest month runs 1.7× the quietest.
What does it cost to enter the magnesium supplements niche?: Listings span £3.44–£9.37; the average listing price is £6.94 (sweet spot $15–$100). The average incumbent carries 9,416 reviews — the moat a new listing must climb.