Is spirulina capsules profitable to sell on Amazon United States?

The niche generates $843K/yr across 34 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.8%. Flapen's verdict: Worth a look (59/100).

How competitive is the spirulina capsules niche?

19 brands and 47 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 75% of demand.

What do buyers complain about in spirulina capsules?

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

When does demand for spirulina capsules peak?

Demand is steady year-round — the busiest month runs 1.4× the quietest.

What does it cost to enter the spirulina capsules niche?

Listings span $5.82–$126.95; the average listing price is $23.76 (sweet spot $15–$100). The average incumbent carries 3,700 reviews — the moat a new listing must climb.

spirulina capsules

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

Incredible$23.76

avg listing price — sweet spot $15–$100

Conversion

Great9.2%

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

Market size

Good$843K

$843K/yr · 384K searches

Price range

Good$5.82–$126.95

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

Competition

Good50%

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

Brand share

Good75%

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

Review moat

Okay3,700.32

avg incumbent reviews — the moat a new listing must climb

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-10.8%

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

According to Flapen's Amazon United States niche tracking, spirulina capsules is a $843K/yr Amazon United States market (384K searches/yr). The top 5 brands hold 75% of demand. Verdict: Worth a look — 59/100.

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

spirulina capsules market data

Units sold / yr: 30K–40K; avg 1,000–1,250/product
Revenue / yr: $713K–$950K; units × avg price
Conversion rate: 9.2%
Avg BSR: #203
Page quality: 0%
Prime: 100%
Sponsored: 74%
Out of stock: 3.0%
Avg brand age: 73 months
Avg seller age: 166 days

Competition & brand share

The top 5 products take 50% of clicks — established leaders, but buyers still shop beyond them.

Brands

19 rising

Sellers

Top-5 brand share

75%

Top 20: 100%

Top-5 click share

50%

Top 20: 85%

Open market

22%

Nutrex Hawaii22%
NOW Foods20%
Micro Ingredients17%
Triquetra Health9%
Carlyle6%
HCL HERBAL CODE LABS4%

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — -10.8% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.4×

Open Trend

Top spirulina capsules search terms

spirulina capsules161K/yr -19.8%7.8% conv.
spirulina tablets56K/yr +11.7%6.8% conv.
spirulina capsules organic36K/yr -21.3%6.8% conv.
nutrex hawaii spirulina12K/yr +23.6%9.7% conv.
organic spirulina tablets9K/yr +16.3%8.1% conv.
hawaiian spirulina15K/yr +0.0%6.6% conv.
hawaiian spirulina powder7K/yr +71.7%8.9% conv.
espirulina capsulas8K/yr +7.1%3.5% conv.
spirulina pills7K/yr +11.8%5.9% conv.
pure hawaiian spirulina8K/yr -8.2%9.5% conv.

All search terms

Top spirulina capsules 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 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

NOW Foods Supplements Certified Organic Spirulina 1000 mg (Double Strength) Rich in Beta-Carotene (Vitamin A) and B-12 with naturally occurring GLA 120 Tablets

NOW Foods$12.634.6★8,154 rev

Micro Ingredients Organic Spirulina Supplement 720 Tablets (4 Month Supply) No Filler & Non-GMO Rich in Vegan Protein Vitamins & Prebiotics Premium Spirulina Pills

Micro Ingredients$25.304.6★9,946 rev

Nutrex Hawaii Pure Hawaiian Spirulina Vegan Superfood 500 mg Tablets Farm Grown in Kona Non-GMO Immune Support & Cellular Energy 400 Count

Nutrex Hawaii$30.004.6★10,873 rev

Organic Spirulina Tablets (360 Tablets) - Made with Parry Spirulina The Best Spirulina in the World Highest Nutrient Density - Non-Irradiated 3 Organic Certifications (90 Servings)

Triquetra Health$28.634.6★3,401 rev

Nutrex Hawaii Pure Hawaiian Spirulina Powder - Vegan Superfood Farm Grown Non-GMO Immune Support & Cellular Energy 90 Day Supply 9.53 Oz

Nutrex Hawaii$25.214.6★6,993 rev

Newest

by launch date

Nutrex Hawaii Pure Hawaiian Spirulina Powder - Vegan Superfood Farm Grown Non-GMO Immune Support & Cellular Energy 90 Day Supply 9.53 Oz

Nutrex Hawaii$25.216,993 rev

10mo ago

Micro Ingredients Organic Spirulina Chlorella Mini Tablets 2 500 Tablets (8 Month Supply) | 50/50 Algae Blend | No Fillers Non-GMO

Micro Ingredients$26.72478 rev

1y ago

Spirulina Capsules 3000mg - 40 Servings Of Organic Spirulina Capsules - Rich in Protein Antioxidants & Vitamins - 240 Organic Espirulina Powder - Supports Immune & Cardiovascular Health

Nautical Elements$19.661,553 rev

2y ago

Pure Hawaiian Blue Green Spirulina Powder Capsules - 470mg Capsules 100 Pills Non GMO Natural

Complete Natural Products$12.9829 rev

2y ago

NOW Foods Organic Spirulina 1000mg Tablets - 300 Count - Non-GMO Super Green Whole Food Supplement - Double Strength

NOW Foods$29.748,154 rev

3y ago

What buyers say about spirulina capsules

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

What buyers love

Quality-Overall18%

“Great quality, clean ingredients”

Nutritional Content8%

“Great supplement and”

Energy Level8%

“Lots of energy”

Value For Money7%

“it's very affordable”

Vegan/Organic5%

“Organic vitamins”

Vitamin5%

“I love this vitamin”

Ease Of Use5%

“These tablets are easy to take”

Advertised Vs Actual Product4%

“Excellent product, as advertised”

Detoxification3%

“Great detox”

Ease Of Chewing/Swallowing3%

“Easy to swallow”

What buyers complain about

Dosage9%

“The dose is ridiculous”

Smell9%

“The smell of it is unbearable”

Quality-Overall6%

“I would rather pay extra to have better quality spirulina that doesn't have the cancer risk on the packaging”

Acid Regulator/Stomach Ache Relief5%

“Stomach pain”

Side Effects4%

“Made me very sick to my stomach”

Taste-Overall4%

“Obviously spirulina does not taste good by itself”

Functionality-Overall4%

“Didn't work”

Size-Overall3%

“they are small”

Allergies3%

“Adverse reaction”

Value For Money3%

“Way Too Expensive For No results after consuming one whole bag”

Top return reasons

Advertised Vs Actual Product34%

Dosage15%

Smell8%

Value For Money8%

Size-Overall7%

Functionality-Overall4%

Vitamin4%

Heart Health4%

Nutritional Content3%

Ingredients-Overall2%

Common questions

Is spirulina capsules profitable to sell on Amazon United States?: The niche generates $843K/yr across 34 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -10.8%. Flapen's verdict: Worth a look (59/100).
How competitive is the spirulina capsules niche?: 19 brands and 47 sellers compete. The top 5 products take 50% of clicks and top 5 brands hold 75% of demand.
What do buyers complain about in spirulina capsules?: Top complaints mined from reviews: Dosage, Smell, Quality-Overall. The return rate is 0.1%.
When does demand for spirulina capsules peak?: Demand is steady year-round — the busiest month runs 1.4× the quietest.
What does it cost to enter the spirulina capsules niche?: Listings span $5.82–$126.95; the average listing price is $23.76 (sweet spot $15–$100). The average incumbent carries 3,700 reviews — the moat a new listing must climb.