Is selenium 100 mcg profitable to sell on Amazon United States?

The niche generates $177K/yr across 21 tracked products. 90-day search growth is -10.1%. Flapen's verdict: Skip it (49/100).

How competitive is the selenium 100 mcg niche?

12 brands and 551 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 85% of demand.

What do buyers complain about in selenium 100 mcg?

Top complaints mined from reviews: Smell, Size-Overall, Energy Level. The return rate is 0.0%.

When does demand for selenium 100 mcg peak?

Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 13.0× the quietest.

What does it cost to enter the selenium 100 mcg niche?

Listings span $4.99–$39.34; the average listing price is $16.17 (sweet spot $15–$100). The average incumbent carries 2,694 reviews — the moat a new listing must climb.

selenium 100 mcg

Skip it

Soft demand (-10.1% this quarter) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible15.6%

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

Avg price

Great$16.17

avg listing price — sweet spot $15–$100

Price range

Good$4.99–$39.34

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

Competition

Okay59%

top-5 click share — leaders hold, buyers still browse

Review moat

Okay2,693.71

avg incumbent reviews — the moat a new listing must climb

Market size

Okay$177K

$177K/yr · 70K searches

Brand share

Okay85%

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

Quality gap

Bad4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-10.1%

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

According to Flapen's Amazon United States niche tracking, selenium 100 mcg is a $177K/yr Amazon United States market (70K searches/yr). The top 5 brands hold 85% of demand. Demand peaks in Sep–Oct–Nov–Dec. Verdict: Skip it — 49/100.

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

selenium 100 mcg market data

Units sold / yr: 10K–13K; avg 500–750/product
Revenue / yr: $162K–$202K; units × avg price
Conversion rate: 15.6%
Avg BSR: #124
Page quality: 0%
Prime: 100%
Sponsored: 67%
Out of stock: 0.0%
Avg brand age: 120 months
Avg seller age: 168 days

Competition & brand share

The top 5 products take 59% of clicks — established leaders, but buyers still shop beyond them.

Brands

12 rising

Sellers

551

Top-5 brand share

85%

Top 20: 100%

Top-5 click share

59%

Top 20: 99%

Open market

10%

NOW Foods56%
Nutricost10%
Amazing Nutrition7%
Pure Encapsulations6%
THORNE5%
SOLARAY5%
Open — no brand owns it (6 brands, 10%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -10.1% search growth over the last 90 days.

Peak months: Sep, Oct, Nov, Dec · busiest ÷ quietest = 13.0×

Open Trend

Top selenium 100 mcg search terms

selenium 100 mcg38K/yr -30.6%13.8% conv.
selenium 100mcg6K/yr +156.6%14.6% conv.
now selenium 200 mcg6K/yr +26.6%18.5% conv.
now selenium8K/yr -25.6%14.6% conv.
selenium now4K/yr -9.7%15.8% conv.
selenio 100mg3K/yr -24.5%6.6% conv.
selenium 1003K/yr -10.0%13.6% conv.
now foods selenium 200 mcg2K/yr +11.0%16.4% conv.

All search terms

Top selenium 100 mcg 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 21 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NOW Foods Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 250 Tablets

NOW Foods$9.274.7★4,266 rev

Now Foods Selenium 200mcg Capsules 300 Count - L Selenomethionine Mineral Supplement for Women & Men - Veg Caps Non-GMO Vegan Friendly Yeast-Free

NOW Foods$23.364.6★7,820 rev

NOW Supplements Selenium (L-Selenomethionine) 100 mcg Essential Mineral* 100 Tablets

NOW Foods$4.994.7★4,266 rev

Nutricost Selenium Supplement 100mcg 240 Capsules Vegetarian Gluten-Free

Nutricost$12.734.6★284 rev

Amazing Nutrition$9.804.6★110 rev

Newest

by launch date

Amazing Nutrition$9.80110 rev

3y ago

Nutricost Selenium Supplement 100mcg 240 Capsules Vegetarian Gluten-Free

Nutricost$12.73284 rev

4y ago

Designs for Health Thyrommune - Thyroid Support Supplement with Selenium (Selenomethionine) + Myo-Inositol - Vegan & Gluten-Free (60 Capsules)

Designs for Health$27.63161 rev

4y ago

Now Foods Selenium 200mcg Capsules 300 Count - L Selenomethionine Mineral Supplement for Women & Men - Veg Caps Non-GMO Vegan Friendly Yeast-Free

NOW Foods$23.367,820 rev

5y ago

Now Selenium 200mcg Capsules 300 Count (Pack of 2) - L Selenomethionine Mineral Supplement for Women & Men - Veg Caps Non-GMO Vegan Friendly Yeast-Free

NOW Foods$39.34106 rev

6y ago

What buyers say about selenium 100 mcg

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

What buyers love

Quality-Overall22%

“The quality seems consistent”

Vitamin9%

“Great price for these vitamins”

Value For Money9%

“its pretty affordable”

Advertised Vs Actual Product8%

“It has an accurate description”

Efficiency6%

“Effective”

Ease Of Chewing/Swallowing5%

“Easy to swallow”

Hormonal Balance5%

“I use this to take with my thyroid medication because it helps it to work better”

Regulates Digestion3%

“It is the gentle push my thyroid needed”

Nutritional Content3%

“Great quality supplement”

Energy Level3%

“Has been certainly boosting my energy”

What buyers complain about

Smell29%

“it has disgusting smell”

Size-Overall5%

“They are very small”

Energy Level5%

“It didn't give me energy”

Dosage5%

“Cannot force myself to take this more than once”

Value For Money5%

“a total waste of money”

Side Effects4%

“Caused brain fog”

Functionality-Overall4%

“Started havent seen results”

Taste-Overall3%

“It didnt taste funky”

Ingredients-Overall3%

“empty half a selenium capsule into one”

Quality-Overall3%

“There are better priced quality products”

Top return reasons

Joint Pain33%

Functionality-Overall33%

Color33%

Common questions

Is selenium 100 mcg profitable to sell on Amazon United States?: The niche generates $177K/yr across 21 tracked products. 90-day search growth is -10.1%. Flapen's verdict: Skip it (49/100).
How competitive is the selenium 100 mcg niche?: 12 brands and 551 sellers compete. The top 5 products take 59% of clicks and top 5 brands hold 85% of demand.
What do buyers complain about in selenium 100 mcg?: Top complaints mined from reviews: Smell, Size-Overall, Energy Level. The return rate is 0.0%.
When does demand for selenium 100 mcg peak?: Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 13.0× the quietest.
What does it cost to enter the selenium 100 mcg niche?: Listings span $4.99–$39.34; the average listing price is $16.17 (sweet spot $15–$100). The average incumbent carries 2,694 reviews — the moat a new listing must climb.