Glycine
MaybeAn estimated 0.1% of orders come back. But demand is soft, at -22.8% this quarter, so Glycine is a Maybe.
- Flapen Score
- 50 / 100Top 41% of 2,035 Health & Personal Care niches · +2 vs the category median of 4850
- Market size
- £316K/yr198K searches / yr
- 90-day growth
- -22.8%search demand this quarter
- Competition
- 75%top-5 click share · 11 brands · 15 sellers
Flapen Score
Glycine against its category
The dotted line is the Health & Personal Care average. Past it, Glycine is stronger. Inside it, weaker.
Market
The Glycine market on Amazon at a glance
Shoppers on Amazon United Kingdom searched for Glycine 198K times last year and spent an estimated £316K. The top 5 brands take 78% of clicks. Flapen scores it 50 out of 100, a Maybe.
01 · Demand
An estimated 13.6% of those searches ended in a purchase.
Shoppers searched for this 198K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. An estimated 13.6% of those searches ended in a purchase. Searches in the last 90 days moved -22.8% against the 90 days before. Searches, conversion and average price together put the market at an estimated £316K a year.
- Searches, last 12 months
- 198K
- Growth, 90 days vs prior 90
- -22.8%
- Conversion, latest week
- 13.6%
- Market size, estimated
- £316Ka year
- Peak month
- February2.0× the quietest month
- Top search term
- glycine164K searches a year
02 · Price
A sale here is worth £11.72.
Listings sell for £11.72 on average, from £3.97 to £21.83. Amazon reports units sold in ranges. This niche sold 20K to 25K a year. The average listing sells 1,250 to 1,500 of them. At £11.72 that is £15K to £18K a year per listing.
- Average price
- £11.72under the $15 to $100 sweet spot
- Price range
- £3.97–£21.83
- Amazon United Kingdom median price
- £12.12across 27,606 niches
- Units sold a year
- 20K–25K
- Units per listing a year
- 1,250–1,500
- Revenue per listing a year
- £15K–£18K
- Returns
- 0.1%of orders · Amazon United Kingdom median 0.6%
03 · Entry bar
The bar here is low.
77% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.8% of listings are out of stock. The average listing ranks #194 within Diet & Nutrition. It carries 568 reviews at 4.48 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 77%
- Prime listings
- 100%
- Out of stock, average day
- 0.8%
- Average rank
- #194in Diet & Nutrition
- Average rating
- 4.48 starsAmazon United Kingdom average 4.36 stars
- Average reviews
- 568per listing
- Listings tracked
- 13
04 · Newcomers
2 of last year's 3 launches cleared the first-year sales bar.
3 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 44 months on average, so the names here are settling in.
- Launched, last 12 months
- 3
- Successful launches
- 2Amazon's first-year sales bar
- Average brand age
- 44 months
Products
Top Glycine products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 24, 2026. The live listing can differ.
Top sellers
by estimated 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
Trending
estimated 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
- Price
- £8.07
- Rating
- 4.5/5
- Reviews
- 306
- Age
- 5mo ago

Bulk Glycine Powder 500 g
- Price
- £3.97
- Rating
- 4.6/5
- Reviews
- 822
- Age
- 12y 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

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

Thorne Glycine 250 Capsules
- Price
- £21.83
- Rating
- 4.7/5
- Reviews
- 1,430
- Age
- 15y 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
Competition: brands, sellers & click share
The top 5 products take an estimated 75% of clicks. A locked shelf that new listings rarely crack.
Brands
11 falling
Sellers
15
Est. top-5 brand share
78%
Top 20: 100%
Est. 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
Glycine search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 2.0×
Search terms
Top Glycine search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- glycine164K/yr
- glycine supplement11K/yr
- l-glycine8K/yr
- l glycine5K/yr
- glycine 3g7K/yr
- glycin2K/yr
Reviews and returns
What reviews say buyers love and hate about Glycine
We read the reviews and the return reasons for every product selling here.
“not much difference to sleep quality”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
18 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Glycine questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









