How competitive is the Glycine niche on Amazon United Kingdom?

11 brands and 15 sellers compete in Glycine on Amazon United Kingdom. The top 5 Glycine products take 75% of clicks and its top 5 brands hold 78% of demand.

What do buyers complain about in Glycine?

Glycine buyers on Amazon United Kingdom complain most about Sleep Quality, Dosage, Advertised Vs Actual Product, the themes mined from the niche's reviews. Its return rate is 0.1%.

What does it cost to enter the Glycine niche?

Glycine sells for £11.72 on average on Amazon United Kingdom, outside our $15–$100 sweet spot. Listings span £3.97–£21.83. The average incumbent carries 568 reviews — the moat a new listing must climb.

Glycine

Glycine shows low returns (0.1%), but soft demand (-22.8% this quarter) keeps it on the watch list.

Flapen Score

Worth a look

This niche Category average

Is Glycine profitable on Amazon?

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.

Glycine: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Worth a look. Search demand moved -22.8% over the last 90 days and 13.6% of searches end in a purchase.

£316K

revenue / yr

Units sold / yr25K

Search volume / yr-22.8%198K

Conversion rate13.6%

Avg price£11.72

Who owns the niche?

The top 5 brands hold 78% of demand, so 22% of the market is open.

22%

open market share

Brands · sellers11 · 15

Top-5 product click share75%

Open market22%

Avg brand age44 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.5★ — the gap to enter on.

0/100

page quality · 13 products

Top Glycine products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Top sellers

by 90-day click share

Bulk Glycine Powder 500 g

Price: £3.97
Rating: 4.6/5
Reviews: 822
Age: 12y ago

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

Price: £8.17
Rating: 4.3/5
Reviews: 100
Age: 10mo ago

Fermented L Glycine 1500mg with BioPerine 180 Vegan Capsules High Strength L Glycine Amino Acid Supplement Resealable and Recyclable Pouch By Alpha01

Price: £7.33
Rating: 4.4/5
Reviews: 139
Age: 7y ago

Thorne Glycine 250 Capsules

Price: £21.83
Rating: 4.7/5
Reviews: 1,430
Age: 15y ago

Vegavero Pure Glycine Powder 1 kg | 3000 mg Daily Dose | NO Additives Lab-Tested | Recovery Muscle & Collagen Synthesis | with Measuring Spoon | Vegan

Price: £18.00
Rating: 4.5/5
Reviews: 2,394
Age: 3y ago

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

Price: £8.07
Rating: 4.5/5
Reviews: 306
Age: 5mo ago

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

Price: £8.17
Rating: 4.3/5
Reviews: 100
Age: 10mo ago

Vitamatic Glycine Supplement 2000mg Per Serving 300 Count Non-GMO Gluten Free

Price: £16.12
Rating: 4.6/5
Reviews: 201
Age: 11mo ago

Now Foods Glycine 1000mg 100 Vegan Capsules Amino Acid Gluten Free Vegetarian Soy Free Non GMO

Price: £19.14
Rating: 4.5/5
Reviews: 86
Age: 3y ago

L Glycine Supplement 1500mg | 180 Vegan Tablets | Amino Acid Nutritional Supplements | by Horbaach

Price: £7.17
Rating: 4.3/5
Reviews: 251
Age: 3y ago

Competition: brands, sellers & click share

The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.

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

Brands

11 falling

Sellers

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%)

Glycine demand & seasonality

Weekly search volume, with the niche's key stats alongside.

Volume198KCVR13.6%Products13Brands11Top 5 Brands78%OOS Rate0.8%Rating4.5★Reviews568Avg BSR#194

No pronounced peak months · busiest ÷ quietest = 2.0×

Top Glycine search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

glycine164K/yr -21.6%12.3% conv.
glycine supplement11K/yr -14.0%6.5% conv.
l-glycine8K/yr -7.5%8.0% conv.
l glycine5K/yr -1.6%19.3% conv.
glycine 3g7K/yr -74.2%7.3% conv.
glycin2K/yr -4.8%10.5% conv.

What reviews say buyers love and hate about Glycine

What buyers mention most, as a share of all reviews.

What buyers love

73% of reviews

Sleep Quality28%

“Helps me sleep”

Quality-Overall11%

“Excellent product”

Value For Money9%

“Good value for money”

Taste-Overall6%

“Tastes nice as well”

Solubility5%

“Mixes easily”

What buyers complain about

51% of reviews

Sleep Quality11%

“not much difference to sleep quality”

Dosage8%

“Apart from that some capsules are half empty”

Advertised Vs Actual Product5%

“Utterly deceptive”

Side Effects5%

“serious side effects are possible”

Quality-Overall4%

“Bad quality”

Glycine return rate & reasons

Why buyers send it back, as a share of all return requests.

0.1%

Return rate

Fixable by listing

The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.

1Functionality-Overall

50%

2Ease Of Chewing/Swallowing

50%

Common Glycine questions

The questions sellers ask about this niche, answered from the tracked metrics.

Flapen scores Glycine 50/100 on Amazon United Kingdom — Worth a look. The niche generates £316K/yr across 13 tracked products. 2 of 3 products launched in the last 360 days are still selling. Search demand moved -22.8% over the last 90 days.