Is kelp profitable to sell on Amazon United States?

The niche generates $508K/yr across 28 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.9%. Flapen's verdict: Worth a look (60/100).

How competitive is the kelp niche?

27 brands and 651 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 58% of demand.

What do buyers complain about in kelp?

Top complaints mined from reviews: Value For Money, Smell, Regulates Digestion. The return rate is 0.1%.

When does demand for kelp peak?

Demand is steady year-round — the busiest month runs 1.2× the quietest.

What does it cost to enter the kelp niche?

Listings span $5.40–$117.56; the average listing price is $19.23 (sweet spot $15–$100). The average incumbent carries 1,761 reviews — the moat a new listing must climb.

Kelp

Worth a look

Shows low returns (0.1%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Avg price

Great$19.23

avg listing price — sweet spot $15–$100

Conversion

Great8.7%

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

Brand share

Great58%

top-5 brand share — no brand owns this niche

Price range

Great$5.40–$117.56

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

Market size

Good$508K

$508K/yr · 304K searches

Competition

Good51%

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

Review moat

Okay1,761.07

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-6.9%

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

Is kelp profitable on Amazon?

According to Flapen's Amazon United States niche tracking, kelp is a $508K/yr Amazon United States market (304K searches/yr). The top 5 brands hold 58% of demand. Verdict: Worth a look — 60/100.

Data updated Jul 27, 2026 · scored weekly · How we score niches

kelp market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 25K–30K; avg 1,000–1,250/product
Revenue / yr: $481K–$577K; units × avg price
Conversion rate: 8.7%
Avg BSR: #323
Page quality: 0%
Prime: 100%
Sponsored: 75%
Out of stock: 0.5%
Avg brand age: 86 months
Avg seller age: 149 days

Competition: brands, sellers & click share

The top 5 products take 51% of clicks — established leaders, but buyers still shop beyond them.

Brands

27 rising

Sellers

651

Top-5 brand share

58%

Top 20: 93%

Top-5 click share

51%

Top 20: 92%

Open market

37%

NOW Foods25%
Nature's Way9%
Zazzee9%
Complete Natural Products7%
Nutricost7%
Dr. Berg Nutritionals5%

kelp demand & seasonality

Weekly Amazon search volume, last 104 weeks — -6.9% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.2×

Open Trend

Top kelp search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

kelp160K/yr +1.8%5.6% conv.
kelp supplement68K/yr -21.2%11.1% conv.
sea kelp35K/yr +5.4%5.1% conv.
organic kelp9K/yr -6.9%5.7% conv.
kelp tablets7K/yr -39.1%9.7% conv.
kelp capsules5K/yr -20.1%13.1% conv.
kelp iodine4K/yr +6.2%8.8% conv.
kelp iodine supplement4K/yr -49.1%8.3% conv.
organic sea kelp2K/yr -19.8%6.7% conv.
kelp tablets for iodine organic3K/yr -29.8%12.4% conv.

All search terms

Top kelp 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NOW Supplements Kelp 325 mcg of Natural Iodine Supports Healthy Thyroid Function* Super Green 250 Veg Capsules

NOW Foods$10.934.6★4,024 rev

Natures Way Kelp - Kelp Supplement for Thyroid Function Support* - Botanical Ingredient - Plant-Derived Capsule - Plant-sourced Iodine - Vegan Gluten-Free & Dairy-Free - 180 Count (180 Servings)

Nature's Way$13.144.6★5,169 rev

NOW Supplements Kelp 150 mcg of Natural Iodine Easier to Swallow Tablet Super Green 200 Tablets

NOW Foods$7.514.6★1,475 rev

Zazzee USDA Organic Kelp Iodine 30:1 Extract 300 mcg per Capsule 120 Vegan Capsules 4 Month Supply Ocean-Harvested Norwegian Kelp Standardized to 1% Iodine for Exact Dosage Thyroid Support

Zazzee$19.364.7★46 rev

Complete Natural Products Organic Icelandic Sea Kelp Capsules - Pure 600mg Capsules 100 Pills Raw Seaweed & Thyroid Support Supplement

Complete Natural Products$11.954.6★532 rev

Newest

by launch date

Organic Sea Kelp Fertilizer for Plants Water-Soluble Makes 50 Gallons Kelp Meal Concentrate Plant Food for Indoor Gardens Hydroponics Vegetables Houseplants - Smart Grower - 2oz Bag

Smart Grower$19.64312 rev

1y ago

Organic Kelp Powder for Dogs - 4oz Thyroid & Dental Support with 5cc Scoop

Chew + Heal Labs$9.86411 rev

1y ago

Tahoe Nutritionals Kelp Supplement | 180 Capsules | with Green Tea Extract | Non-GMO & Gluten Free

Tahoe Nutritionals$9.55222 rev

2y ago

Dr. Berg Sea Kelp Enhanced Iodine - 200 mcg of Premium Iodine - Seaweed Blend Includes Klamath Blue-Green Algae & Sea Kelp - 90 Capsules

Dr. Berg Nutritionals$33.83604 rev

2y ago

Organic Iodine Supplement from Sea Vegetable Complex Whole Food & Raw Form - Iodine Plus Trace Mineral Complex Contains Purest Icelandic Sea Kelp Irish Moss & Bladderwrack (250 mcg)

Triquetra Health$17.781,895 rev

3y ago

What reviews say buyers love and hate about kelp

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

What buyers love

Quality-Overall16%

“well made product”

Plant Growth7%

“Great for plants”

Value For Money6%

“Great buy for the Money”

Ease Of Use4%

“Easy to use”

Vitamin4%

“it's a really good vitamin”

Advertised Vs Actual Product4%

“As advertised”

Efficiency4%

“Wonderful and effective”

Ease Of Chewing/Swallowing4%

“The capsules are easy to take”

Nutritional Content3%

“Great supplement definitely recommended”

Vegan/Organic3%

“The ingredients are all organic which is great”

What buyers complain about

Value For Money8%

“could be more competitively priced”

Smell5%

“Fishy smell”

Regulates Digestion5%

“reflux I just dont want take pills everyday for this”

Dosage4%

“I cant take it”

Functionality-Overall4%

“Doesn't seem to do much for me”

Side Effects4%

“This can cause diarrhea, dizziness and headache”

Taste-Overall4%

“Not much taste”

Acid Regulator/Stomach Ache Relief3%

“Sadly after a couple of days of using my stomach felt like it had a knot in it”

Allergies3%

“he said I am having an allergic reaction to something”

Vitamin2%

“This supplement does not agree with me”

Top return reasons

Leak-Proof26%

Size-Overall17%

Advertised Vs Actual Product16%

Value For Money8%

Plant Growth7%

Functionality-Overall6%

Defective Material/Parts4%

Certifications2%

Moist/Dry2%

Storage Temperature1%

Common kelp questions

Is kelp profitable to sell on Amazon United States?: The niche generates $508K/yr across 28 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -6.9%. Flapen's verdict: Worth a look (60/100).
How competitive is the kelp niche?: 27 brands and 651 sellers compete. The top 5 products take 51% of clicks and top 5 brands hold 58% of demand.
What do buyers complain about in kelp?: Top complaints mined from reviews: Value For Money, Smell, Regulates Digestion. The return rate is 0.1%.
When does demand for kelp peak?: Demand is steady year-round — the busiest month runs 1.2× the quietest.
What does it cost to enter the kelp niche?: Listings span $5.40–$117.56; the average listing price is $19.23 (sweet spot $15–$100). The average incumbent carries 1,761 reviews — the moat a new listing must climb.