Glycine
MaybeReturns run at only 0.1% of orders. 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
13.6% of searches ended in a purchase last week.
Shoppers searched for this 198K times in the last 12 months. That counts every search on Amazon United Kingdom for this niche's terms. In the latest week, 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
Amazon counts 2 of last year's 3 launches as successful.
3 products launched here in the last 12 months. Amazon counts 2 of them as successful launches, new products that hit its first-year sales bar. 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
Every tracked product: its share of the shelf, its reviews, and its price.
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
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
- 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 75% of clicks. A locked 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
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 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
What buyers praise, what they complain about and why they send it back, from the reviews.
Complain
not much difference to sleep quality
makes it more difficult to sleep
was too wired for sleep
Apart from that some capsules are half empty
I dont even know how to accurately measure the daily dose with mistakes as it stands
NOT 1500 mg
Utterly deceptive
Vegavero claim in their photo that it is 'MADE IN GERMANY' - that is incorrect
this is no different to my pictured current brand
serious side effects are possible
Side effects
Overdose taking it everyday made me sedated and nauseuous
Bad quality
it at least seems poorer quality than Bulk
I don't think this is very good quality
Love
Helps me sleep
Better sleep
Helps me to sleep well
Excellent product
Solid, value glycine with a clean profile
I'm happy with the quality
Good value for money
Good deal
the 100 servings offer excellent value for money
Tastes nice as well
has no unpleasant taste
The taste is naturally sweet and pleasant
Mixes easily
The powder mixes well
This mixes well
Return
0.1% Return rate 0% Fixable by listing
Doesn't work for everyone
No results
Keep looking
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Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Glycine questions
Answered from the same tracked data.









