---
title: "Glycine — £316K/yr Amazon UK Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/uk/health-personal-care/glycine"
last_updated: "2026-07-31T11:38:42.644Z"
locale: en
meta:
description: "Niche score 50/100 · £316K/yr market · 198K searches/yr · £11.72 avg price. Soft demand (-22.8% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · £316K/yr market · 198K searches/yr · £11.72 avg price. Soft demand (-22.8% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Glycine — £316K/yr Amazon UK Niche (2026) - Flapen"
---
# **glycine**
**Worth a look**
Shows low returns (0.1%), but soft demand (-22.8% this quarter) keeps it on the watch list.
Market size 52Growth 14Conversion 96Competition 21Returns 100Price range 38Avg price 48Brand share 46Review moat 73Quality gap 45
**Returns**
**Incredible****0.1%**
return rate — above 5% kills the launch gate
**Conversion**
**Incredible****13.6%**
search→purchase rate — share of searches ending in a sale
**Review moat**
**Good****568.23**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****£316K**
£316K/yr · 198K searches
**Avg price**
**Okay****£11.72**
avg listing price — sweet spot $15–$100
**Brand share**
**Okay****78%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Price range**
**Okay****£3.97–£21.83**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Competition**
**Bad****75%**
top-5 click share — a locked-up shelf
**Growth**
**Bad****-22.8%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United Kingdom niche tracking, glycine is a £316K/yr Amazon United Kingdom market (198K searches/yr). The top 5 brands hold 78% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 24, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **glycine market data**
- **Units sold / yr**
- **20K–25K**
- avg 1,250–1,500/product
- **Revenue / yr**
- **£234K–£293K**
- units × avg price
- **Conversion rate**
- **13.6%**
- **Avg BSR**
- **#194**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **77%**
- **Out of stock**
- **0.8%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **173 days**
## **Competition & brand share**
The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**11 **▼falling
**Sellers**
**15**
**Top-5 brand share**
**78%**
Top 20: 100%
**Top-5 click share**
**75%**
Top 20: 100%
**Open market**
**16%**
- Bulk32% - NEW LEAF PRODUCTS18% - ALPHA0114% - THORNE8% - Peak Supps7% - Vegavero7% - Open — no brand owns it (5 brands, 16%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -22.8% search growth over the last 90 days.
5K3KSpike '24Spike '25Black Friday '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 2.0×
[**Open Trend **](https://flapen.com/research/uk/health-personal-care/glycine/trend)
## **Top glycine search terms**
- **glycine**164K/yr-21.6%12.3% conv. - **glycine supplement**11K/yr-14.0%6.5% conv. - **l-glycine**8K/yr-7.5%8.0% conv. - **l glycine**5K/yr-1.6%19.3% conv. - **glycine 3g**7K/yr-74.2%7.3% conv. - **glycin**2K/yr-4.8%10.5% conv. [**All search terms **](https://flapen.com/research/uk/health-personal-care/glycine/search-terms)
## **Top glycine 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%10%£32K20%£63K30%£95K40%£126K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**Bulk Glycine Powder 500 g**Bulk**£3.97**4.6★822 rev](https://www.amazon.co.uk/dp/B00HF60S86) [2**L-Glycine Capsules - 180 High Strength Vegan Amino Acid Suppelements - 1600mg Per Serving Providing A 3 Month Supply - Glycine Supplement Made in The UK By New Leaf**NEW LEAF PRODUCTS**£8.17**4.3★100 rev](https://www.amazon.co.uk/dp/B0FRN7XHBC) [3**Fermented L Glycine 1500mg with BioPerine 180 Vegan Capsules High Strength L Glycine Amino Acid Supplement Resealable and Recyclable Pouch By Alpha01**ALPHA01**£7.33**4.4★139 rev](https://www.amazon.co.uk/dp/B0DHQL3RJ5) [4**Thorne Glycine 250 Capsules**THORNE**£21.83**4.7★1,430 rev](https://www.amazon.co.uk/dp/B000VYRROC) [5**Vegavero Pure Glycine Powder 1 kg | 3000 mg Daily Dose | NO Additives Lab-Tested | Recovery Muscle & Collagen Synthesis | with Measuring Spoon | Vegan**Vegavero**£18.00**4.5★2,394 rev](https://www.amazon.co.uk/dp/B0BK8X47M5)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**LALEA Pure Glycine Powder 500g 100% Pure L-Glycine Amino Acid Supplement Vegan No Additives Highly Soluble Supports Sleep Muscle Recovery & Collagen Production**lalea**£8.07**306 rev5mo ago](https://www.amazon.co.uk/dp/B0GP41YH62) [**L-Glycine Capsules - 180 High Strength Vegan Amino Acid Suppelements - 1600mg Per Serving Providing A 3 Month Supply - Glycine Supplement Made in The UK By New Leaf**NEW LEAF PRODUCTS**£8.17**100 rev10mo ago](https://www.amazon.co.uk/dp/B0FRN7XHBC) [**Vitamatic Glycine Supplement 2000mg Per Serving 300 Count Non-GMO Gluten Free**Vitamatic**£16.12**201 rev11mo ago](https://www.amazon.co.uk/dp/B0D9BW4B3D) [**Now Foods Glycine 1000mg 100 Vegan Capsules Amino Acid Gluten Free Vegetarian Soy Free Non GMO**NOW**£19.14**86 rev3y ago](https://www.amazon.co.uk/dp/B0C4FHZPQ9) [**L Glycine Supplement 1500mg | 180 Vegan Tablets | Amino Acid Nutritional Supplements | by Horbaach**Horbäach**£7.17**251 rev3y ago](https://www.amazon.co.uk/dp/B0BRJVCCKB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**LALEA Pure Glycine Powder 500g 100% Pure L-Glycine Amino Acid Supplement Vegan No Additives Highly Soluble Supports Sleep Muscle Recovery & Collagen Production**lalea**£8.07**4.5★**▲ 294%**](https://www.amazon.co.uk/dp/B0GP41YH62) [**Bulk Glycine Powder 500 g**Bulk**£3.97**4.6★**▲ 45%**](https://www.amazon.co.uk/dp/B00HF60S86) [**Vitamatic Glycine Supplement 2000mg Per Serving 300 Count Non-GMO Gluten Free**Vitamatic**£16.12**4.6★**▲ 43%**](https://www.amazon.co.uk/dp/B0D9BW4B3D) [**L-Glycine Capsules - 180 High Strength Vegan Amino Acid Suppelements - 1600mg Per Serving Providing A 3 Month Supply - Glycine Supplement Made in The UK By New Leaf**NEW LEAF PRODUCTS**£8.17**4.3★**▲ 22%**](https://www.amazon.co.uk/dp/B0FRN7XHBC) [**Thorne Glycine 250 Capsules**THORNE**£21.83**4.7★**— 8%**](https://www.amazon.co.uk/dp/B000VYRROC)
**~~View all trending →~~**
## **What buyers say about glycine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**28%
*“Helps me sleep”*
**Quality-Overall**11%
*“Excellent product”*
**Value For Money**9%
*“Good value for money”*
**Taste-Overall**6%
*“Tastes nice as well”*
**Solubility**5%
*“Mixes easily”*
**Sweetness**4%
*“The taste is naturally sweet and pleasant”*
**Vegan/Organic**3%
*“* Vegan-friendly. unlike collagen itself”*
**Ease Of Use**2%
*“found it straightforward to take”*
**Soothing Effect**2%
*“it does have a calming feel”*
**Ingredients-Overall**2%
*“pure gives me peace of mind about the quality of the ingredients I am putting into my body”*
### **What buyers complain about **
**Sleep Quality**11%
*“not much difference to sleep quality”*
**Dosage**8%
*“Apart from that some capsules are half empty”*
**Advertised Vs Actual Product**5%
*“Utterly deceptive”*
**Side Effects**5%
*“serious side effects are possible”*
**Quality-Overall**4%
*“Bad quality”*
**Functionality-Overall**4%
*“Doesn't work for everyone”*
**Size-Overall**4%
*“They are absolutely massive”*
**Taste-Overall**3%
*“This one has zero taste”*
**Smell**3%
*“I stopped using them as a smell of sulphur was coming off me which I didn't like”*
**Focus Enhancement**3%
*“Not for an over active mind”*
### **Top return reasons **
**Functionality-Overall**50%
**Ease Of Chewing/Swallowing**50%
## **Common questions**
- **Is glycine profitable to sell on Amazon United Kingdom?**
- The niche generates £316K/yr across 13 tracked products. 2 of 3 products launched in the last 360 days are still selling. 90-day search growth is -22.8%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the glycine niche?**
- 11 brands and 15 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 78% of demand.
- **What do buyers complain about in glycine?**
- Top complaints mined from reviews: Sleep Quality, Dosage, Advertised Vs Actual Product. The return rate is 0.1%.
- **When does demand for glycine peak?**
- Demand is steady year-round — the busiest month runs 2.0× the quietest.
- **What does it cost to enter the glycine niche?**
- Listings span £3.97–£21.83; the average listing price is £11.72 (sweet spot $15–$100). The average incumbent carries 568 reviews — the moat a new listing must climb.
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