spermidine
Skip itA concentrated shelf (top 5 take 90% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.1%return rate — above 5% kills the launch gate
Review moat
Great139.14avg incumbent reviews — the moat a new listing must climb
Conversion
Great9.5%search→purchase rate — share of searches ending in a sale
Avg price
Great£16.77avg listing price — sweet spot $15–$100
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Price range
Good£7.49–£30.80cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Okay90%top-5 brand share — brands hold most of the demand
Growth
Bad-12.5%90-day search growth — must beat 0% to launch
Market size
Bad£72K£72K/yr · 45K searches
Competition
Bad90%top-5 click share — a locked-up shelf
According to Flapen's Amazon United Kingdom niche tracking, spermidine is a £72K/yr Amazon United Kingdom market (45K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in Aug. Verdict: Skip it — 47/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
spermidine market data
- Units sold / yr
- 4K–5K
- avg 250–500/product
- Revenue / yr
- £67K–£84K
- units × avg price
- Conversion rate
- 9.5%
- Avg BSR
- #1,781
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 71%
- Out of stock
- 7.7%
- Avg brand age
- 36 months
- Avg seller age
- 181 days
Competition & brand share
The top 5 products capture 90% of clicks — a locked-up shelf that new listings rarely crack.Brands
7 falling
Sellers
8
Top-5 brand share
90%
Top 20: 100%
Top-5 click share
90%
Top 20: 100%
Open market
5%
- Vinco Supplements49%
- Pure: Vitality17%
- Nutra Science9%
- vitabay9%
- Time Health6%
- Youth & Earth5%
- Open — no brand owns it (1 brand, 5%)
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — -12.5% search growth over the last 90 days.Peak months: Aug · busiest ÷ quietest = 1.9×
Top spermidine search terms
- spermidine supplements21K/yr
- spermidine20K/yr
- spermidine supplements for men4K/yr
Top spermidine 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.
All 7 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Vinco Spermidine Supplement - 10mg x 120 High Strength Spermidine Capsules - 99% Purity - Supports Healthy Ageing & Longevity - Non GMO & Gluten Free - Made in The UK
Vinco Supplements£10.544.5★177 rev
Pure Vitality : Spermidine 98% Purity - 90 x 6mg Vegan Capsules - GMP HACCP Certified - UK Manufacturer - Lab Tested - Wheatgerm
Pure: Vitality£7.494.4★183 rev
Nutra Science Spermidine 99% Concentration | 100X More Potent Than Wheat Germ Spermidine Supplements | 90 Vegan Spermidine Capsules 10mg Serving Highest Purity in the UK
Nutra Science£23.264.2★27 rev
Vitabay Spermidine 6 mg High Strength Supplement 120 Vegan Capsules with Fermented Wheat Germ Extract Laboratory Tested in Germany No Additives 4 Month Supply
vitabay£16.384.5★435 rev
Renew - Spermidine - 99% Purity - Maximum Strength - 6.5mg x 60 Capsules - Longevity Support - GMP Standards - UK Made - Vegan (60 Count (Pack of 1))
Time Health£16.454.2★48 rev
Newest
by launch dateVinco Spermidine Supplement - 10mg x 120 High Strength Spermidine Capsules - 99% Purity - Supports Healthy Ageing & Longevity - Non GMO & Gluten Free - Made in The UK
Vinco Supplements£10.54177 rev
Youth & Earth Liposomal Spermidine | 60 Capsules of Spermidine Supplements for Hair Growth Autophagy & Nail Growth
Youth & Earth£30.8081 rev
Pure Vitality : Spermidine 98% Purity - 90 x 6mg Vegan Capsules - GMP HACCP Certified - UK Manufacturer - Lab Tested - Wheatgerm
Pure: Vitality£7.49183 rev
Vitabay Spermidine 6 mg High Strength Supplement 120 Vegan Capsules with Fermented Wheat Germ Extract Laboratory Tested in Germany No Additives 4 Month Supply
vitabay£16.38435 rev
Nutra Science Spermidine 99% Concentration | 100X More Potent Than Wheat Germ Spermidine Supplements | 90 Vegan Spermidine Capsules 10mg Serving Highest Purity in the UK
Nutra Science£23.2627 rev
Trending
90-day click momentumYouth & Earth Liposomal Spermidine | 60 Capsules of Spermidine Supplements for Hair Growth Autophagy & Nail Growth
Youth & Earth£30.804.3★
Renew - Spermidine - 99% Purity - Maximum Strength - 6.5mg x 60 Capsules - Longevity Support - GMP Standards - UK Made - Vegan (60 Count (Pack of 1))
Time Health£16.454.2★
Vitabay Spermidine 6 mg High Strength Supplement 120 Vegan Capsules with Fermented Wheat Germ Extract Laboratory Tested in Germany No Additives 4 Month Supply
vitabay£16.384.5★
Nutra Science Spermidine 99% Concentration | 100X More Potent Than Wheat Germ Spermidine Supplements | 90 Vegan Spermidine Capsules 10mg Serving Highest Purity in the UK
Nutra Science£23.264.2★
Vinco Spermidine Supplement - 10mg x 120 High Strength Spermidine Capsules - 99% Purity - Supports Healthy Ageing & Longevity - Non GMO & Gluten Free - Made in The UK
Vinco Supplements£10.544.5★
What buyers say about spermidine
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality”
“Value for money”
“My metabolism is faster”
“My hair is growing soooo quickly”
“The capsules are easy to take”
“As described”
“Im happy with this supplement overall”
“No side effects, feel great taking it and its super easy on the system”
“The dosage is clear”
“I have much more energy”
What buyers complain about
“Not great quality”
“the synthetic version has not been proven to provide the named effects of the natural product”
“Misleading info, not wheat germ extract”
Common questions
- Is spermidine profitable to sell on Amazon United Kingdom?
- The niche generates £72K/yr across 7 tracked products. 90-day search growth is -12.5%. Flapen's verdict: Skip it (47/100).
- How competitive is the spermidine niche?
- 7 brands and 8 sellers compete. The top 5 products take 90% of clicks and top 5 brands hold 90% of demand.
- What do buyers complain about in spermidine?
- Top complaints mined from reviews: Quality-Overall, Natural Ingredients, Advertised Vs Actual Product. The return rate is 0.1%.
- When does demand for spermidine peak?
- Demand peaks in Aug; the busiest month runs 1.9× the quietest.
- What does it cost to enter the spermidine niche?
- Listings span £7.49–£30.80; the average listing price is £16.77 (sweet spot $15–$100). The average incumbent carries 139 reviews — the moat a new listing must climb.