Magnesium 400 Mg
Skip itBrand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible14.1%search→purchase rate — share of searches ending in a sale
Market size
Great$1.3M$1.3M/yr · 584K searches
Avg price
Great$15.39avg listing price — sweet spot $15–$100
Price range
Good$4.10–$40.09cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Okay70%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-12.6%90-day search growth — must beat 0% to launch
Review moat
Bad24,674.24avg incumbent reviews — the moat a new listing must climb
Brand share
Bad98%top-5 brand share — brand-locked demand
Is magnesium 400 mg profitable on Amazon?
According to Flapen's Amazon United States niche tracking, magnesium 400 mg is a $1.3M/yr Amazon United States market (584K searches/yr). The top 5 brands hold 98% of demand. Demand peaks in Aug–Sep. Verdict: Skip it — 49/100.
Data updated Jul 28, 2026 · scored weekly · How we score niches
magnesium 400 mg market size & sales
Units sold, revenue, conversion and listing quality across the tracked shelf.- Units sold / yr
- 80K–100K
- avg 6,000–8,000/product
- Revenue / yr
- $1.2M–$1.5M
- units × avg price
- Conversion rate
- 14.1%
- Avg BSR
- #237
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 67%
- Out of stock
- 0.0%
- Avg brand age
- 64 months
- Avg seller age
- 146 days
Competition: brands, sellers & click share
The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.Brands
7 rising
Sellers
176
Top-5 brand share
98%
Top 20: 100%
Top-5 click share
70%
Top 20: 99%
Open market
1%
- Nature Made81%
- Nature's Bounty8%
- Amazon Basics6%
- Qunol2%
- NOW Foods2%
- Double Wood Supplements1%
- Open — no brand owns it (1 brand, 1%)
magnesium 400 mg demand & seasonality
Weekly Amazon search volume, last 104 weeks — -12.6% search growth over the last 90 days.Peak months: Aug, Sep · busiest ÷ quietest = 3.0×
Top magnesium 400 mg search terms shoppers use
The exact queries shoppers type, with yearly volume, growth and conversion.- magnesium 400 mg102K/yr
- nature made magnesium158K/yr
- magnesium nature made43K/yr
- magnesium 400mg93K/yr
- magnesium 40028K/yr
- magnesium extra strength 400 mg21K/yr
- 400 mg magnesium16K/yr
- magnesium extra strength14K/yr
- magnesium 400 mg nature made11K/yr
- magnesium 400mg softgels11K/yr
Top magnesium 400 mg products & what they sell for
Every tracked product — its share of the shelf, its review moat, and what it sells for.Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels
Nature Made$10.074.7★44,839 rev
Nature Made Magnesium Oxide Extra Strength 400 mg 110 Softgels
Nature Made$11.324.7★44,839 rev
Nature Made Magnesium Oxide 250 mg for Muscle Relaxation 200 Tablets
Nature Made$6.804.7★34,776 rev
Nature Made Magnesium Glycinate 300 mg per 3 Capsules 90 Capsules
Nature Made$21.134.7★2,683 rev
Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count
Amazon Basics$13.704.6★98 rev
Newest
by launch date
Nature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets
Nature Made$13.2975 rev
Nature Made Magnesium + Ashwagandha Capsules 60 Capsules
Nature Made$11.06107 rev
Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count
Amazon Basics$13.7098 rev
Nature Made Extra Strength Magnesium 400 mg. 180 Softgelsm Bundle with a Pill Oragnizer (2 Items)
Nature Made$27.9538 rev
Nature Made Magnesium Glycinate 300 mg per 3 Capsules 90 Capsules
Nature Made$21.132,683 rev
Trending
90-day click momentumNature Made Extra Strength Dosage Magnesium Citrate Tablets 60 Tablets
Nature Made$13.294.4★
Nature Made Magnesium + Ashwagandha Capsules 60 Capsules
Nature Made$11.064.3★
Amazon Basics Magnesium Bone & Muscle Health Capsules 400 mg 250 Count
Amazon Basics$13.704.6★
Nature Made Extra Strength Magnesium 400 mg. 180 Softgelsm Bundle with a Pill Oragnizer (2 Items)
Nature Made$27.954.5★
Nature Made Magnesium Oxide Extra Strength 400 mg 60 Softgels
Nature Made$10.074.7★
What reviews say buyers love and hate about magnesium 400 mg
What buyers praise and complain about, mined from review topics.What buyers love
“The quality is solid”
“Helps me sleep”
“Great magnesium tablets”
“They are affordable”
“arrived as described”
“Good daily vitamin”
“Relaxs my tight muscles”
“Good works as intended”
“Easier to swallow”
“Perfect dosage per capsule”
What buyers complain about
“Too much magnesium”
“Capsules too large”
“Dosage too high”
“Not good for sleep”
“Miss leading information”
“VERY HARD TO SWALLOW”
“Didn't work for me”
“Side effects”
“Stomach Pain and Discomfort”
“Not working for muscle cramps”
Top return reasons
Common magnesium 400 mg questions
- Is magnesium 400 mg profitable to sell on Amazon United States?
- The niche generates $1.3M/yr across 21 tracked products. 4 of 4 products launched in the last 360 days are still selling. 90-day search growth is -12.6%. Flapen's verdict: Skip it (49/100).
- How competitive is the magnesium 400 mg niche?
- 7 brands and 176 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 98% of demand.
- What do buyers complain about in magnesium 400 mg?
- Top complaints mined from reviews: Magnesium, Size-Overall, Dosage. The return rate is 0.0%.
- When does demand for magnesium 400 mg peak?
- Demand peaks in Aug–Sep; the busiest month runs 3.0× the quietest.
- What does it cost to enter the magnesium 400 mg niche?
- Listings span $4.10–$40.09; the average listing price is $15.39 (sweet spot $15–$100). The average incumbent carries 24,674 reviews — the moat a new listing must climb.