Kelp
MaybeAn estimated 0.1% of orders come back. But demand is soft, at -6.9% this quarter, so Kelp is a Maybe.
- Flapen Score
- 60 / 100Top 11% of 14,768 Health & Household niches · +11 vs the category median of 4960
- Market size
- $508K/yr304K searches / yr
- 90-day growth
- -6.9%search demand this quarter
- Competition
- 51%top-5 click share · 27 brands · 651 sellers
Flapen Score
Kelp against its category
The dotted line is the Health & Household average. Past it, Kelp is stronger. Inside it, weaker.
Market
The Kelp market on Amazon at a glance
Shoppers on Amazon United States searched for Kelp 304K times last year and spent an estimated $508K. The top 5 brands take 58% of clicks. Flapen scores it 60 out of 100, a Maybe.
01 · Demand
An estimated 8.7% of those searches ended in a purchase.
Shoppers searched for this 304K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 8.7% of those searches ended in a purchase. Searches in the last 90 days moved -6.9% against the 90 days before. Searches, conversion and average price together put the market at an estimated $508K a year.
- Searches, last 12 months
- 304K
- Growth, 90 days vs prior 90
- -6.9%
- Conversion, latest week
- 8.7%
- Market size, estimated
- $508Ka year
- Peak month
- January1.2× the quietest month
- Top search term
- kelp160K searches a year
02 · Price
A sale here is worth $19.23.
Listings sell for $19.23 on average, from $5.40 to $117.56. Amazon reports units sold in ranges. This niche sold 25K to 30K a year. The average listing sells 1,000 to 1,250 of them. At $19.23 that is $19K to $24K a year per listing.
- Average price
- $19.23inside the $15 to $100 sweet spot
- Price range
- $5.40–$117.56
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 25K–30K
- Units per listing a year
- 1,000–1,250
- Revenue per listing a year
- $19K–$24K
- Returns
- 0.1%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
75% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.5% of listings are out of stock. The average listing ranks #323 within Glandular Extracts. It carries 1,761 reviews at 4.56 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 75%
- Prime listings
- 100%
- Out of stock, average day
- 0.5%
- Average rank
- #323in Glandular Extracts
- Average rating
- 4.56 starsAmazon United States average 4.42 stars
- Average reviews
- 1,761per listing
- Listings tracked
- 28
04 · Newcomers
1 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 86 months on average, so the names here are established.
- Launched, last 12 months
- 1
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 86 months
Products
Top Kelp products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 27, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
NOW Supplements Kelp 325 mcg of Natural Iodine Supports Healthy Thyroid Function* Super Green 250 Veg Capsules
- Price
- $10.93
- Rating
- 4.6/5
- Reviews
- 4,024
- Age
- 22y ago

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)
- Price
- $13.14
- Rating
- 4.6/5
- Reviews
- 5,169
- Age
- 21y ago

NOW Supplements Kelp 150 mcg of Natural Iodine Easier to Swallow Tablet Super Green 200 Tablets
- Price
- $7.51
- Rating
- 4.6/5
- Reviews
- 1,475
- Age
- 19y ago

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
- Price
- $19.36
- Rating
- 4.7/5
- Reviews
- 46
- Age
- 4y ago

Complete Natural Products Organic Icelandic Sea Kelp Capsules - Pure 600mg Capsules 100 Pills Raw Seaweed & Thyroid Support Supplement
- Price
- $11.95
- Rating
- 4.6/5
- Reviews
- 532
- Age
- 9y ago
Trending
estimated 90-day click momentum
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
- Price
- $19.36
- Rating
- 4.7/5
- Reviews
- 46
- Age
- 4y ago

GS Plant Foods Liquid Kelp Fertilizer Suitable for Organic Growing OMRI Listed Seaweed Concentrate for Lawns Gardens & Soil - 1 Gallon (Makes Up To 800+ Gallons)
- Price
- $39.33
- Rating
- 4.6/5
- Reviews
- 3,437
- Age
- 13y ago

Bloom City Seaweed and Kelp Fertilizer Liquid Seaweed Supplement for Stronger Roots Faster Growth & Improved Stress Tolerance 32 oz
- Price
- $19.37
- Rating
- 4.6/5
- Reviews
- 5,495
- Age
- 9y ago

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
- Price
- $19.64
- Rating
- 4.6/5
- Reviews
- 312
- Age
- 1y ago

Unhas Korean Wild Kombu Dried Kelp for Dashi 3.52 oz
- Price
- $9.64
- Rating
- 4.5/5
- Reviews
- 338
- Age
- 4y ago
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
- Price
- $19.64
- Rating
- 4.6/5
- Reviews
- 312
- Age
- 1y ago

Organic Kelp Powder for Dogs - 4oz Thyroid & Dental Support with 5cc Scoop
- Price
- $9.86
- Rating
- 4.4/5
- Reviews
- 411
- Age
- 1y ago

Tahoe Nutritionals Kelp Supplement | 180 Capsules | with Green Tea Extract | Non-GMO & Gluten Free
- Price
- $9.55
- Rating
- 4.5/5
- Reviews
- 222
- Age
- 2y ago

Dr. Berg Sea Kelp Enhanced Iodine - 200 mcg of Premium Iodine - Seaweed Blend Includes Klamath Blue-Green Algae & Sea Kelp - 90 Capsules
- Price
- $33.83
- Rating
- 4.8/5
- Reviews
- 604
- Age
- 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)
- Price
- $17.78
- Rating
- 4.7/5
- Reviews
- 1,895
- Age
- 3y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 51% of clicks. Leaders hold, but buyers still shop past them.
Brands
27 rising
Sellers
651
Est. top-5 brand share
58%
Top 20: 93%
Est. top-5 click share
51%
Top 20: 92%
Open market
37%
- NOW Foods25%
- Nature's Way9%
- Zazzee9%
- Complete Natural Products7%
- Nutricost7%
- Dr. Berg Nutritionals5%
Demand
Kelp search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.2×
Search terms
Top Kelp search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- kelp160K/yr
- kelp supplement68K/yr
- sea kelp35K/yr
- organic kelp9K/yr
- kelp tablets7K/yr
- kelp capsules5K/yr
- kelp iodine4K/yr
- kelp iodine supplement4K/yr
- organic sea kelp2K/yr
- kelp tablets for iodine organic3K/yr
Reviews and returns
What reviews say buyers love and hate about Kelp
We read the reviews and the return reasons for every product selling here.
“could be more competitively priced”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
24 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Kelp questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









