Is sea kelp profitable to sell on Amazon United Kingdom?

The niche generates £79K/yr across 13 tracked products. 90-day search growth is -16.7%. Flapen's verdict: Skip it (40/100).

How competitive is the sea kelp niche?

13 brands and 26 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 79% of demand.

What do buyers complain about in sea kelp?

Top complaints mined from reviews: Ingredients-Overall, Dosage, Calcium. The return rate is 0.1%.

When does demand for sea kelp peak?

Demand is steady year-round — the busiest month runs 1.3× the quietest.

What does it cost to enter the sea kelp niche?

Listings span £3.52–£14.89; the average listing price is £8.93 (sweet spot $15–$100). The average incumbent carries 733 reviews — the moat a new listing must climb.

sea kelp

Skip it

Prices mostly outside the sweet spot ($3.52–$14.89) — this niche doesn't clear our bar today.

Returns

Incredible0.1%

return rate — above 5% kills the launch gate

Conversion

Incredible13.5%

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

Review moat

Good732.85

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay79%

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

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Avg price

Okay£8.93

avg listing price — sweet spot $15–$100

Market size

Bad£79K

£79K/yr · 66K searches

Competition

Bad79%

top-5 click share — a locked-up shelf

Growth

Bad-16.7%

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

Price range

Bad£3.52–£14.89

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

According to Flapen's Amazon United Kingdom niche tracking, sea kelp is a £79K/yr Amazon United Kingdom market (66K searches/yr). The top 5 brands hold 79% of demand. Verdict: Skip it — 40/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

sea kelp market data

Units sold / yr: 8K–10K; avg 500–750/product
Revenue / yr: £71K–£89K; units × avg price
Conversion rate: 13.5%
Avg BSR: #92
Page quality: 0%
Prime: 100%
Sponsored: 85%
Out of stock: 5.9%
Avg brand age: 70 months
Avg seller age: 180 days

Competition & brand share

The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.

Brands

13 falling

Sellers

Top-5 brand share

79%

Top 20: 100%

Top-5 click share

79%

Top 20: 100%

Open market

17%

PH PROWISE Healthcare28%
Natures Aid21%
Horbäach19%
INNOPURE5%
ALPHA015%
Nutravita5%
Open — no brand owns it (7 brands, 17%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -16.7% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.3×

Open Trend

Top sea kelp search terms

sea kelp23K/yr -6.3%10.5% conv.
kelp18K/yr -18.1%6.3% conv.
sea kelp tablets15K/yr -31.0%16.7% conv.
kelp tablets11K/yr -15.8%14.6% conv.

All 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.

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

All 13 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Sea Kelp 2000mg 200 Vegan Tablets | Natural Source of Iodine | Premium Ingredients | Proudly Made in the UK by Prowise

PH PROWISE Healthcare£6.864.5★511 rev

Natures Aid Sea Kelp 187mg 180 Vegan Tablets High Strength Iodine Supplement Supports Thyroid Function & Skin With Calcium Gluten Free Natural Source No Artificial Additives

Natures Aid£3.944.5★995 rev

Horbäach£6.274.6★1,483 rev

INNOPURE Organic Sea Kelp 500mg Pure-Fill (No Fillers or Binders) 435mcg of Iodine Supplement per Capsule Soil Association Certified UK Made 90 Capsules (3 Month Supply)

INNOPURE£13.384.5★1,037 rev

Sea Kelp Extract 2520mg Tablets - 500g Natural Iodine - 180 Vegan Tablets (6 Months Supply) - High Strength 30:1 Ascophyllum Nodosum Extract - Resealable and Recyclable Pouch by Alpha01

ALPHA01£6.694.8★52 rev

Newest

by launch date

INNOPURE Organic Sea Kelp 500mg Pure-Fill (No Fillers or Binders) 435mcg of Iodine Supplement per Capsule Soil Association Certified UK Made 90 Capsules (3 Month Supply)

INNOPURE£13.381,037 rev

1y ago

Sea Kelp Iodine Supplement Complex - 365 Vegan Tablets - 435mcg of Iodine per Tablet - 1 Year Supply - Wild Harvested Seaweed - GMO Free - Made in The UK - Nu U Nutrition

Nu U Nutrition£14.34315 rev

2y ago

Sea Kelp 2000mg 200 Vegan Tablets | Natural Source of Iodine | Premium Ingredients | Proudly Made in the UK by Prowise

PH PROWISE Healthcare£6.86511 rev

3y ago

Sea Kelp 500 mg with Iodine High Strength Vegan Supplement for Thyroid Support and Skin Soil Association Organic and Made in UK 60 Capsules (2 Months Supply)

BIRCH & WILDE£10.4143 rev

3y ago

KIKI Health Organic Sea Kelp Iodine Supplement | Thyroid Support Natural Antioxidants | Immunity & Metabolism | Gluten- & GMO-Free 90 Capsules 500mg

KIKI HEALTH£14.8961 rev

4y ago

What buyers say about sea kelp

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

What buyers love

Quality-Overall22%

“good quality product”

Value For Money19%

“Great value”

Ease Of Chewing/Swallowing7%

“Easy to swallow”

Taste-Overall5%

“Lovely Seaweed”

Regulates Digestion5%

“I got this for the iodine as it's high strength as it helps to eliminate toxins from the body especially hormones”

Vitamin5%

“Small easy to take supplements”

Natural Ingredients5%

“Very natural”

Energy Level5%

“energy levels”

Advertised Vs Actual Product4%

“Does the job”

Immunity Booster4%

“I have taken kelp before so I know it's going to help my immune system and digestion”

What buyers complain about

Ingredients-Overall42%

“problem ingredients”

Dosage18%

“I don't know if they will have any effect yet as I have only just started taking them”

Calcium17%

“It's too early to tell if it will deliver the Calcium I need”

Iron6%

“Beware high Iodine level for daily consumption”

Top return reasons

Functionality-Overall25%

Dosage25%

Leak-Proof13%

Quality-Overall13%

Immunity Booster13%

Ingredients-Overall13%

Common questions

Is sea kelp profitable to sell on Amazon United Kingdom?: The niche generates £79K/yr across 13 tracked products. 90-day search growth is -16.7%. Flapen's verdict: Skip it (40/100).
How competitive is the sea kelp niche?: 13 brands and 26 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 79% of demand.
What do buyers complain about in sea kelp?: Top complaints mined from reviews: Ingredients-Overall, Dosage, Calcium. The return rate is 0.1%.
When does demand for sea kelp peak?: Demand is steady year-round — the busiest month runs 1.3× the quietest.
What does it cost to enter the sea kelp niche?: Listings span £3.52–£14.89; the average listing price is £8.93 (sweet spot $15–$100). The average incumbent carries 733 reviews — the moat a new listing must climb.