magtein
Skip itA small market ($38K/yr) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Avg price
Incredible£23.18avg listing price — sweet spot $15–$100
Price range
Great£11.95–£31.74cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great7.9%search→purchase rate — share of searches ending in a sale
Review moat
Okay2,629.82avg incumbent reviews — the moat a new listing must climb
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay84%top-5 brand share — brands hold most of the demand
Growth
Bad-17.5%90-day search growth — must beat 0% to launch
Competition
Bad81%top-5 click share — a locked-up shelf
Market size
Bad£38K£38K/yr · 21K searches
According to Flapen's Amazon United Kingdom niche tracking, magtein is a £38K/yr Amazon United Kingdom market (21K searches/yr). The top 5 brands hold 84% of demand. Verdict: Skip it — 42/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
magtein market data
- Units sold / yr
- 2K–2K
- avg 100–250/product
- Revenue / yr
- £35K–£46K
- units × avg price
- Conversion rate
- 7.9%
- Avg BSR
- #471
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 82%
- Out of stock
- 7.7%
- Avg brand age
- 35 months
- Avg seller age
- 183 days
Competition & brand share
The top 5 products capture 81% of clicks — a locked-up shelf that new listings rarely crack.Brands
10 rising
Sellers
35
Top-5 brand share
84%
Top 20: 100%
Top-5 click share
81%
Top 20: 100%
Open market
12%
- Time Health41%
- Vinco Supplements13%
- swiss bioenergetics11%
- Double Wood Supplements10%
- Hexagon9%
- Intelligent Labs4%
- Open — no brand owns it (4 brands, 12%)
Demand
Weekly Amazon search volume, last 14 weeks — -17.5% search growth over the last 90 days.Top magtein 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 11 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Magtein Magnesium Threonate 120 Capsules High Strength 2100mg Pullulan Capsules UK Made to GMP & HACCP Standards Zero Additives
Time Health£22.064.5★1,083 rev
Vinco Magnesium L-Threonate Supplement - 120 High Strength Magnesium L Threonate Capsules - 2000mg Bioavailable Form of Magnesium per Serving - Non-GMO & Gluten Free - Made in The UK
Vinco Supplements£11.954.5★737 rev
Double Wood Magnesium L Threonate Supplement | 120 Capsules (30 Servings) High Strength Magnesium L Threonate (4 per Serving) 2000mg
Double Wood Supplements£31.744.6★18,625 rev
Magnesium L-Threonate Magtein 2000mg - Memory Mental Clarity Restorative Sleep - Optimal Cerebral Assimilation - Patented Form from MIT - 90 Vegan Capsules - +1 Month Cure - Hexagon
Hexagon£23.174.5★197 rev
Magnesium L-Threonate 2100mg Daily Dose Magtein 30 Day Supply - Providing 151mg of Active Elemental Magnesium - Easily Absorbable - Highly Bioavailable No Artificial fillers - UK Manufactured
swiss bioenergetics£23.174.5★296 rev
Newest
by launch date
NaturesPlus Magtein Magnesium L-Threonate- High Strength Calm Mood Memory Focus Cognitive - Vegan Non-GMO Gluten-Free - 90 Capsules
Nature's Plus£29.672 rev
Magnesium L-Threonate Magtein 2000mg - Memory Mental Clarity Restorative Sleep - Optimal Cerebral Assimilation - Patented Form from MIT - 90 Vegan Capsules - +1 Month Cure - Hexagon
Hexagon£23.17197 rev
Bandini Magnesium L-Threonate Magtein | High Strength Magnesium L Threonate 2000mg per Serving with Vitamins B1 B6 and B12 | 90 Vegan Capsules | High Absorption for Cognitive Function Support
BANDINI£28.0256 rev
HARMONIFY Magnesium L Threonate Supplement with L Theanine Lemon Balm and Apigenin High Absorption 120 Purified Veggie Capsules 1400 mg Gluten Free Non-GMO Vegetarian
HARMONIFY£14.0829 rev
Vinco Magnesium L-Threonate Supplement - 120 High Strength Magnesium L Threonate Capsules - 2000mg Bioavailable Form of Magnesium per Serving - Non-GMO & Gluten Free - Made in The UK
Vinco Supplements£11.95737 rev
Trending
90-day click momentum
MagEnhance Magnesium Complex for Sleep Support - Magtein L-threonate Glycinate & Taurate - Nervous System & Muscle Relaxation Gentle on the Stomach 90 Vegan Capsules 30-Day Supply
Intelligent Labs£20.754.4★
NaturesPlus Magtein Magnesium L-Threonate- High Strength Calm Mood Memory Focus Cognitive - Vegan Non-GMO Gluten-Free - 90 Capsules
Nature's Plus£29.675.0★
Life Extension Neuro-Mag Magnesium-L-Threonate Minerals Muscle Cramps 90 Capsules Nutritional Supplement Vegan Gluten Free Soy Free
Life Extension£31.194.6★
Magnesium L-Threonate Magtein 2000mg - Memory Mental Clarity Restorative Sleep - Optimal Cerebral Assimilation - Patented Form from MIT - 90 Vegan Capsules - +1 Month Cure - Hexagon
Hexagon£23.174.5★
Bandini Magnesium L-Threonate Magtein | High Strength Magnesium L Threonate 2000mg per Serving with Vitamins B1 B6 and B12 | 90 Vegan Capsules | High Absorption for Cognitive Function Support
BANDINI£28.024.7★
What buyers say about magtein
What buyers praise and complain about, mined from review topics.What buyers love
“Better sleep”
“So far, good quality for money, no side effects”
“Good quality magnesium supplement”
“It is very efficient”
“these are great value”
“For long term cognitive and sleep benefits”
“Doing what is suppose to do”
“Great feeling of calmness”
“Easy to take”
“Great feeling of calmness”
What buyers complain about
“Made no difference to my sleep”
“took it two hours after my breakfast due to drinking tea which would gave a negative effect on the magnesium”
“Therefore these are 4 X more expensive than advertised”
“Abdominal pain”
“you have to be aware that you are taking massive doses of magnesium if you take it according to the instructions, way a over the recommended daily intake and for some people this causes abdominal pain and other issues, and may not be good for heart and kidneys on a long term basis”
“As with all nutritional supplements, I have no results to compare”
“Didnt work for me”
“PRODUCT HAS CHANGED INGREDIENTS”
“The new bottles do not have the logo”
“Didn't love it tbh due to the fish aftertaste being pretty strong”
Top return reasons
Common questions
- Is magtein profitable to sell on Amazon United Kingdom?
- The niche generates £38K/yr across 11 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is -17.5%. Flapen's verdict: Skip it (42/100).
- How competitive is the magtein niche?
- 10 brands and 35 sellers compete. The top 5 products take 81% of clicks and top 5 brands hold 84% of demand.
- What do buyers complain about in magtein?
- Top complaints mined from reviews: Sleep Quality, Magnesium, Value For Money. The return rate is 0.1%.
- What does it cost to enter the magtein niche?
- Listings span £11.95–£31.74; the average listing price is £23.18 (sweet spot $15–$100). The average incumbent carries 2,630 reviews — the moat a new listing must climb.