mag
Skip itPrices mostly outside the sweet spot ($3.44–$14.56) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Conversion
Incredible15.8%search→purchase rate — share of searches ending in a sale
Market size
Good£292K£292K/yr · 224K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Review moat
Bad8,263avg incumbent reviews — the moat a new listing must climb
Avg price
Bad£8.26avg listing price — sweet spot $15–$100
Brand share
Bad92%top-5 brand share — brand-locked demand
Competition
Bad82%top-5 click share — a locked-up shelf
Growth
Bad-36.3%90-day search growth — must beat 0% to launch
Price range
Bad£3.44–£14.56cheapest to priciest tracked listing — scored on the share inside $15–$100
According to Flapen's Amazon United Kingdom niche tracking, mag is a £292K/yr Amazon United Kingdom market (224K searches/yr). The top 5 brands hold 92% of demand. Verdict: Skip it — 39/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
mag market data
- Units sold / yr
- 30K–40K
- avg 2,500–3,000/product
- Revenue / yr
- £248K–£330K
- units × avg price
- Conversion rate
- 15.8%
- Avg BSR
- #22
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 92%
- Out of stock
- 0.0%
- Avg brand age
- 44 months
- Avg seller age
- 164 days
Competition & brand share
The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 falling
Sellers
44
Top-5 brand share
92%
Top 20: 100%
Top-5 click share
82%
Top 20: 100%
Open market
5%
- VitaBright36%
- Vitabiotics Ultra27%
- Nobi Nutrition13%
- Zipvit8%
- Nutrition Geeks8%
- SMNutrition3%
- Open — no brand owns it (3 brands, 5%)
Demand
Weekly Amazon search volume, last 21 weeks — -36.3% search growth over the last 90 days.Top mag search terms
- magnesium glycinate 400mg43K/yr
- vitabright magnesium glycinate27K/yr
- vitabiotics magnesium34K/yr
- tablet magnesium9K/yr
- magnesium 6 in 1 complex12K/yr
- ultra magnesium8K/yr
- magnesium glycinate and zinc8K/yr
- magnesium 400mg8K/yr
- pro magnesium 46K/yr
- magnesium 500mg5K/yr
Top mag 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.
All 12 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Magnesium Supplements Tablets
Vitabiotics Ultra£3.444.6★5,535 rev
VitaBright Magnesium Glycinate Supplements | 180 Capsules | 1500mg 300mg Elemental Mg | High Strength Chelated Magnesium Bisglycinate for Adults | Tablets for Nerves & Psychological Support
VitaBright£14.564.6★4,507 rev
VitaBright Magnesium Glycinate Complex 6-in-1 | 2500mg 485mg Elemental | 120 Caps | Glycinate Tablets Zinc Vitamin B6 & D | High Strength Magnesium Supplements for Women | ZMA Supplements for Men
VitaBright£8.014.6★2,454 rev
Magnesium Glycinate 400mg | Chelated Bisglycinate for Muscle Relaxation Bones Heart Nerve Rest & Calm Support for Women & Men | High Absorption Magnesium Chelate Supplement | 120 Capsules
Nobi Nutrition£10.644.4★3,814 rev
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
Newest
by launch date
Magnesium Glycinate 400mg | Chelated Magnesium Glycinate for Maximum Absorption & Bioavailability | Calm Relaxation Muscle Health & Energy Support Supplement | Resealable Eco Pack | 60 Capsules
SMNutrition£7.4931 rev
Magnesium Glycinate 4-in-1 Complex - 400mg Elemental Mg - 180 Capsules
WeightWorld£9.373,717 rev
VitaBright Magnesium Glycinate Complex 6-in-1 | 2500mg 485mg Elemental | 120 Caps | Glycinate Tablets Zinc Vitamin B6 & D | High Strength Magnesium Supplements for Women | ZMA Supplements for Men
VitaBright£8.012,454 rev
Magnesium Glycinate 400mg | Chelated Bisglycinate for Muscle Relaxation Bones Heart Nerve Rest & Calm Support for Women & Men | High Absorption Magnesium Chelate Supplement | 120 Capsules
Nobi Nutrition£10.643,814 rev
Zipvit Magnesium Glycinate 2000mg with 400mg Elemental Plus Vitamin B6 120 Vegan Tablets High Strength Magnesium Supplements
Zipvit£7.912,240 rev
Trending
90-day click momentumMagnesium Glycinate 400mg | Chelated Magnesium Glycinate for Maximum Absorption & Bioavailability | Calm Relaxation Muscle Health & Energy Support Supplement | Resealable Eco Pack | 60 Capsules
SMNutrition£7.494.3★
Magnesium Citrate Capsules 1480mg | 444mg Elemental | 4 Months | Electrolytes & Hydration - Regular Daily Use | Magnesium Supplements for Women & Men | Not Powder or Tablets | VitaBright
VitaBright£12.884.5★
Zipvit Magnesium Glycinate 2000mg with 400mg Elemental Plus Vitamin B6 120 Vegan Tablets High Strength Magnesium Supplements
Zipvit£7.914.6★
VitaBright Magnesium Glycinate Supplements | 180 Capsules | 1500mg 300mg Elemental Mg | High Strength Chelated Magnesium Bisglycinate for Adults | Tablets for Nerves & Psychological Support
VitaBright£14.564.6★
Magnesium Glycinate 400mg | Chelated Bisglycinate for Muscle Relaxation Bones Heart Nerve Rest & Calm Support for Women & Men | High Absorption Magnesium Chelate Supplement | 120 Capsules
Nobi Nutrition£10.644.4★
What buyers say about mag
What buyers praise and complain about, mined from review topics.What buyers love
“sleep more deeply”
“the quality is always consistent”
“Best magnesium out there”
“EXCELLENT VALUE FOR MONEY”
“As Advertised”
“Muscle pain improved”
“Vitamins, easy to swallow good amount of supply”
“Easy to chew and tasty”
“Effective: They do exactly what I bought them for”
“Easy Peasy”
What buyers complain about
“unable to sleep”
“It is not your ordinary magnesium”
“It does absolutely nothing”
“The dose is misleading”
“Caused severe stomach cramps”
“Small size”
“However, I have had some uncomfortable side effects:”
“There is no reason for this sort of quality control failure unless I am misunderstanding the process”
“Expensive”
“Misleading Product”
Top return reasons
Common questions
- Is mag profitable to sell on Amazon United Kingdom?
- The niche generates £292K/yr across 12 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -36.3%. Flapen's verdict: Skip it (39/100).
- How competitive is the mag niche?
- 9 brands and 44 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 92% of demand.
- What do buyers complain about in mag?
- Top complaints mined from reviews: Sleep Quality, Magnesium, Functionality-Overall. The return rate is 0.1%.
- What does it cost to enter the mag niche?
- Listings span £3.44–£14.56; the average listing price is £8.26 (sweet spot $15–$100). The average incumbent carries 8,263 reviews — the moat a new listing must climb.