---
title: "Sea Kelp — $78K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/sea-kelp"
last_updated: "2026-08-07T09:18:31.989Z"
locale: en
meta:
description: "Niche score 41/100 · $78K/yr market · 37K searches/yr · $15.21 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $78K/yr market · 37K searches/yr · $15.21 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Sea Kelp — $78K/yr Amazon US Niche (2026) - Flapen"
---
# **sea kelp**
**Skip it**
A concentrated shelf (top 5 take 89% of clicks) — this niche doesn't clear our bar today.
Market size 19Growth 17Conversion 96Competition 9Returns 100Price range 67Avg price 76Brand share 27Review moat 42Quality gap 21
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.9%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$15.21**
avg listing price — sweet spot $15–$100
**Price range**
**Good****$5.62–$33.84**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Okay****2,280.75**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Okay****89%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$78K**
$78K/yr · 37K searches
**Growth**
**Bad****-15.6%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****89%**
top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, sea kelp is a $78K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 89% of demand. Verdict: Skip it — 41/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **sea kelp market data**
- **Units sold / yr**
- **4K–5K**
- avg 500–750/product
- **Revenue / yr**
- **$61K–$76K**
- units × avg price
- **Conversion rate**
- **13.9%**
- **Avg BSR**
- **#611**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **75%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **86 months**
- **Avg seller age**
- **155 days**
## **Competition & brand share**
The top 5 products capture 89% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **—flat
**Sellers**
**21**
**Top-5 brand share**
**89%**
Top 20: 100%
**Top-5 click share**
**89%**
Top 20: 100%
**Open market**
**6%**
- Dr. Berg Nutritionals52% - Carlyle17% - Zazzee8% - Triquetra Health6% - Life Extension6% - NOW Foods5% - Open — no brand owns it (2 brands, 6%)
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -15.6% search growth over the last 90 days.
700500Spike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.4×
[**Open Trend **](https://flapen.com/research/us/health-household/sea-kelp/trend)
## **Top sea kelp search terms**
- **sea kelp iodine supplement**16K/yr-16.3%10.1% conv. - **seaweed supplement**9K/yr-9.8%2.5% conv. - **dr berg iodine**4K/yr-15.7%14.1% conv. - **dr berg sea kelp**3K/yr-14.7%18.6% conv. - **sea kelp iodine**3K/yr-25.4%13.7% conv. - **dr berg sea kelp enhanced iodine**2K/yr-23.8%21.6% conv. [**All search terms **](https://flapen.com/research/us/health-household/sea-kelp/search-terms)
## **Top sea kelp 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.
0%15%$12K30%$23K45%$35K60%$47K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 8 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**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**$33.84**4.8★612 rev](https://www.amazon.com/dp/B0CD92611L) [2**Carlyle Sea Kelp Iodine Supplement | 225mcg | 300 Tablets**Carlyle**$10.29**4.6★2,128 rev](https://www.amazon.com/dp/B09H65DFYF) [3**Zazzee USDA Organic Kelp Iodine 30:1 Extract 300 mcg per Capsule Vegan**Zazzee**$19.40**4.6★52 rev](https://www.amazon.com/dp/B0GMKV9YTN) [4**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**$17.79**4.7★1,900 rev](https://www.amazon.com/dp/B0BGJR4HZN) [5**Life Extension Sea-Iodine kelp and bladderwrack-derived Iodine Supports Healthy Levels of This Essential Nutrient for Thyroid Health and Beyond Non-GMO Gluten-Free Vegetarian 60 Capsules**Life Extension**$5.62**4.6★8,248 rev](https://www.amazon.com/dp/B005OTKEKS)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**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**$33.84**612 rev2y ago](https://www.amazon.com/dp/B0CD92611L) [**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**$17.79**1,900 rev3y ago](https://www.amazon.com/dp/B0BGJR4HZN) [**Zazzee USDA Organic Kelp Iodine 30:1 Extract 300 mcg per Capsule Vegan**Zazzee**$19.40**52 rev4y ago](https://www.amazon.com/dp/B0GMKV9YTN) [**Carlyle Sea Kelp Iodine Supplement | 225mcg | 300 Tablets**Carlyle**$10.29**2,128 rev4y ago](https://www.amazon.com/dp/B09H65DFYF) [**Nutricost Kelp Tablets 325mcg of Iodine 240 Tablets Gluten-Free**Nutricost**$11.83**743 rev5y ago](https://www.amazon.com/dp/B0971TDFRC)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Zazzee USDA Organic Kelp Iodine 30:1 Extract 300 mcg per Capsule Vegan**Zazzee**$19.40**4.6★**▲ 307%**](https://www.amazon.com/dp/B0GMKV9YTN) [**Nutricost Kelp Tablets 325mcg of Iodine 240 Tablets Gluten-Free**Nutricost**$11.83**4.7★**▲ 52%**](https://www.amazon.com/dp/B0971TDFRC) [**Life Extension Sea-Iodine kelp and bladderwrack-derived Iodine Supports Healthy Levels of This Essential Nutrient for Thyroid Health and Beyond Non-GMO Gluten-Free Vegetarian 60 Capsules**Life Extension**$5.62**4.6★**▲ 29%**](https://www.amazon.com/dp/B005OTKEKS) [**CNP | Icelandic Sea Kelp Capsules 600mg - Iodine Thyroid Support Pills**Complete Natural Products**$11.95**4.7★**▲ 17%**](https://www.amazon.com/dp/B071Z36QNG) [**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**$33.84**4.8★**— 6%**](https://www.amazon.com/dp/B0CD92611L)
**~~View all trending →~~**
## **What buyers say about sea kelp**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**18%
*“It is a quality capsule”*
**Efficiency**7%
*“Wonderful and effective”*
**Value For Money**7%
*“Reasonably priced”*
**Hormonal Balance**6%
*“Bonus: sea kelp helps with managing estrogen too so it is a must have for women who are dealing with hormone fluctuations”*
**Ease Of Chewing/Swallowing**6%
*“Easy to swallow”*
**Nutritional Content**5%
*“Overall, they seem to be reasonably well-made supplement pills”*
**Advertised Vs Actual Product**5%
*“was as advertised”*
**Vitamin**5%
*“It is a good supplement for me”*
**Vegan/Organic**5%
*“Good quality clean organic”*
**Energy Level**4%
*“seems to help me with energy”*
### **What buyers complain about **
**Side Effects**7%
*“BECAUSE I STARTED FEELING MOODY, DEPRESSED AND EMOTIONAL, CRYING FOR NO GOOD REASON”*
**Nutritional Content**5%
*“Just know, if you're healthy and you take this you MAY NOT be healthy after a few days”*
**Vitamin**4%
*“The daily dose of iodine of 325 mcg per capsule is too high and not healthy”*
**Value For Money**4%
*“could be more competitively priced”*
**Visibility**3%
*“Didnt see a difference”*
**Certifications**3%
*“Company doesnt provide coa/heavy metal testing”*
**Allergies**3%
*“he said I am having an allergic reaction to something”*
**Size-Overall**3%
*“The capsules are small”*
**Salt Content**2%
*“Unfortunately, I dont eat a lot of salt and I tend to use sea salt, which doesnt have added iodine”*
**Dosage**2%
*“Only thing to be aware of is the dosage is on the higher side for some people”*
### **Top return reasons **
**Moist/Dry**100%
## **Common questions**
- **Is sea kelp profitable to sell on Amazon United States?**
- The niche generates $78K/yr across 8 tracked products. 90-day search growth is -15.6%. Flapen's verdict: Skip it (41/100).
- **How competitive is the sea kelp niche?**
- 8 brands and 21 sellers compete. The top 5 products take 89% of clicks and top 5 brands hold 89% of demand.
- **What do buyers complain about in sea kelp?**
- Top complaints mined from reviews: Side Effects, Nutritional Content, Vitamin. The return rate is 0.0%.
- **When does demand for sea kelp peak?**
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- **What does it cost to enter the sea kelp niche?**
- Listings span $5.62–$33.84; the average listing price is $15.21 (sweet spot $15–$100). The average incumbent carries 2,281 reviews — the moat a new listing must climb.
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