Is selenium and zinc supplements profitable to sell on Amazon United States?

The niche generates $482K/yr across 21 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.3%. Flapen's verdict: Worth a look (55/100).

How competitive is the selenium and zinc supplements niche?

11 brands and 555 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 76% of demand.

What do buyers complain about in selenium and zinc supplements?

Top complaints mined from reviews: Side Effects, Dosage, Taste-Overall. The return rate is 0.0%.

When does demand for selenium and zinc supplements peak?

Demand peaks in Jan–Aug; the busiest month runs 2.1× the quietest.

What does it cost to enter the selenium and zinc supplements niche?

Listings span $4.99–$77.90; the average listing price is $29.16 (sweet spot $15–$100). The average incumbent carries 3,396 reviews — the moat a new listing must climb.

selenium and zinc supplements

Worth a look

Shows low returns (0.0%), but soft demand (-10.3% this quarter) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Avg price

Incredible$29.16

avg listing price — sweet spot $15–$100

Price range

Great$4.99–$77.90

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

Conversion

Great7.3%

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

Market size

Good$482K

$482K/yr · 225K searches

Competition

Good55%

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

Brand share

Okay76%

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

Review moat

Okay3,396.38

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-10.3%

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

According to Flapen's Amazon United States niche tracking, selenium and zinc supplements is a $482K/yr Amazon United States market (225K searches/yr). The top 5 brands hold 76% of demand. Demand peaks in Jan–Aug. Verdict: Worth a look — 55/100.

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

selenium and zinc supplements market data

Units sold / yr: 15K–20K; avg 750–1,000/product
Revenue / yr: $437K–$583K; units × avg price
Conversion rate: 7.3%
Avg BSR: #431
Page quality: 0%
Prime: 100%
Sponsored: 95%
Out of stock: 0.4%
Avg brand age: 72 months
Avg seller age: 150 days

Competition & brand share

The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.

Brands

11 flat

Sellers

555

Top-5 brand share

76%

Top 20: 93%

Top-5 click share

55%

Top 20: 99%

Open market

17%

Dr. Mercola54%
--7%
Terry Naturally6%
Nutricost6%
New Chapter5%
SANDHUHERBALS5%
Open — no brand owns it (5 brands, 17%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -10.3% search growth over the last 90 days.

Peak months: Jan, Aug · busiest ÷ quietest = 2.1×

Open Trend

Top selenium and zinc supplements search terms

dr mercola60K/yr -16.7%2.3% conv.
zinc and selenium supplement23K/yr +0.7%6.9% conv.
zinc selenium19K/yr +8.9%6.9% conv.
mercola18K/yr -13.3%2.8% conv.
selenium and zinc9K/yr -10.9%5.1% conv.
selenio y zinc10K/yr -11.8%2.0% conv.
zinc selenium supplements12K/yr -14.3%6.5% conv.
selenium zinc10K/yr -22.1%5.4% conv.
selenium and zinc supplements10K/yr -13.8%5.6% conv.
dr. mercola9K/yr -18.5%2.4% conv.

All search terms

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

Top sellers

by 90-day click share

Dr. Mercola Zinc Plus Selenium - Mineral Blend Supplement - for Immune Brain & Respiratory Support - Contains Zinc Glycinate Chelate & Copper - GMO-Free & Gluten-Free - 90 Capsules (90 Servings)

Dr. Mercola$19.564.7★4,500 rev

Zinc Picolinate 50mg with Copper & Selenium 240 Capsules | 3-in-1 High Absorption Mineral Complex | Chelated Zinc Supplement for Immune Support* | 8 Month Supply

--$19.094.6★2,108 rev

Dr. Mercola Zinc Plus Selenium - Mineral Blend Supplement - for Immune Brain & Respiratory Support - Contains Zinc Glycinate Chelate & Copper - GMO-Free & Gluten-Free - 30 Capsules (30 Servings)

Dr. Mercola$9.954.7★4,500 rev

Terry Naturally Zinc Plus Selenium - Immune & Respiratory Health Supplement - Mineral Supplement with Zinc Bisglycinate Chelate - Formula with Selenium for Cellular Health Support - 60 Capsules

Terry Naturally$16.214.5★435 rev

Nutricost Zinc (50mg) with Selenium (200mcg) 240 Capsules Gluten-Free

Nutricost$17.054.5★31 rev

Newest

by launch date

Nutricost Zinc (50mg) with Selenium (200mcg) 240 Capsules Gluten-Free

Nutricost$17.0531 rev

2mo ago

Zinc 30mg with Copper Selenium & Vitamin D3 | 120 Capsules | Magnesium Vitamin B6 Biotin Complex | Absorbable Chelated Zink Supplements for Men & Women | for Hair Skin Nails & Immune Support

SANDHUHERBALS$24.6022,002 rev

10mo ago

Dr. Berg Zinc 30 mg (60 Capsules) High Potency 7-in-1 Immune Support Formula Chelated Zinc with Vitamin D & Selenium for Healthy Skin Hair & Daily Wellness No Fillers 4X Tested*

Dr. Berg Nutritionals$23.971,880 rev

1y ago

NEW AGE Selenium Zinc Iodine L Tyrosine Ashwagandha - Supplement for Women and Men with Bladderwrack Turmeric Silica Kelp Schisandra - 120 Count

NEW AGE$33.811,179 rev

1y ago

New Chapter Magnesium + Selenium & Zinc Tablets - Bone Health & Muscle Support Supplement* - Supports Electrolyte Balance* - Vegan Gluten Free Non-GMO & Kosher - 30 Tablets

New Chapter$16.49475 rev

2y ago

What buyers say about selenium and zinc supplements

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

What buyers love

Quality-Overall23%

“The quality feels consistent”

Vitamin12%

“Easy to take vitamin”

Energy Level4%

“my energy level has improved significantly”

Value For Money4%

“Great value”

Efficiency4%

“Its effective”

Hormonal Balance4%

“Thyroid support”

Advertised Vs Actual Product3%

“As Advertised”

Dosage3%

“The doses are easy to take”

Regulates Digestion3%

“Easy to digest”

Nutritional Content2%

“its a pretty straightforward supplement that fits into my daily routine without fuss”

What buyers complain about

Side Effects9%

“can make you nauseous”

Dosage8%

“appears to exceed safe/legal dosage limits”

Taste-Overall7%

“Has no taste”

Functionality-Overall6%

“Did not work”

Value For Money6%

“To expensive”

Size-Overall5%

“they are HUGE”

Acid Regulator/Stomach Ache Relief4%

“have had horrific stomach cramps for several hours now”

Vitamin4%

“I cannot recommend this brand nor vitamin combination”

Smell3%

“Smells weird”

Regulates Digestion3%

“May cause gastrointestinal issues”

Top return reasons

Ingredients-Overall20%

Dosage15%

Acid Regulator/Stomach Ache Relief15%

Size-Overall10%

Functionality-Overall10%

Advertised Vs Actual Product10%

Vegan/Organic10%

Product Condition5%

Vitamin5%

Common questions

Is selenium and zinc supplements profitable to sell on Amazon United States?: The niche generates $482K/yr across 21 tracked products. 2 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.3%. Flapen's verdict: Worth a look (55/100).
How competitive is the selenium and zinc supplements niche?: 11 brands and 555 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 76% of demand.
What do buyers complain about in selenium and zinc supplements?: Top complaints mined from reviews: Side Effects, Dosage, Taste-Overall. The return rate is 0.0%.
When does demand for selenium and zinc supplements peak?: Demand peaks in Jan–Aug; the busiest month runs 2.1× the quietest.
What does it cost to enter the selenium and zinc supplements niche?: Listings span $4.99–$77.90; the average listing price is $29.16 (sweet spot $15–$100). The average incumbent carries 3,396 reviews — the moat a new listing must climb.