Glycine
MaybeAn estimated 0.0% of orders come back. But demand is soft, at -15.6% this quarter, so Glycine is a Maybe.
- Flapen Score
- 61 / 100Top 9% of 14,768 Health & Household niches · +12 vs the category median of 4961
- Market size
- $6.2M/yr2.1M searches / yr
- 90-day growth
- -15.6%search demand this quarter
- Competition
- 65%top-5 click share · 11 brands · 31 sellers
Flapen Score
Glycine against its category
The dotted line is the Health & Household average. Past it, Glycine is stronger. Inside it, weaker.
Market
The Glycine market on Amazon at a glance
Shoppers on Amazon United States searched for Glycine 2.1M times last year and spent an estimated $6.2M. The top 5 brands take 75% of clicks. Flapen scores it 61 out of 100, a Maybe.
01 · Demand
An estimated 15.6% of those searches ended in a purchase.
Shoppers searched for this 2.1M times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 15.6% of those searches ended in a purchase. Searches in the last 90 days moved -15.6% against the 90 days before. Searches, conversion and average price together put the market at an estimated $6.2M a year.
- Searches, last 12 months
- 2.1M
- Growth, 90 days vs prior 90
- -15.6%
- Conversion, latest week
- 15.6%
- Market size, estimated
- $6.2Ma year
- Peak month
- February2.1× the quietest month
- Top search term
- glycine1.3M searches a year
02 · Price
A sale here is worth $19.40.
Listings sell for $19.40 on average, from $9.89 to $33.29. Amazon reports units sold in ranges. This niche sold 300K to 400K a year. The average listing sells 15,000 to 20,000 of them. At $19.40 that is $291K to $388K a year per listing.
- Average price
- $19.40inside the $15 to $100 sweet spot
- Price range
- $9.89–$33.29
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 300K–400K
- Units per listing a year
- 15,000–20,000
- Revenue per listing a year
- $291K–$388K
- Returns
- 0.0%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is reviews.
88% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 1.7% of listings are out of stock. The average listing ranks #434 within Amino Acids. It carries 1,701 reviews at 4.58 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 88%
- Prime listings
- 100%
- Out of stock, average day
- 1.7%
- Average rank
- #434in Amino Acids
- Average rating
- 4.58 starsAmazon United States average 4.42 stars
- Average reviews
- 1,701per listing
- Listings tracked
- 16
04 · Newcomers
1 of last year's 1 launches cleared the first-year sales bar.
1 products launched here in the last 12 months. 1 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 56 months on average, so the names here are settling in.
- Launched, last 12 months
- 1
- Successful launches
- 1Amazon's first-year sales bar
- Average brand age
- 56 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 25, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
NOW Foods Supplements Glycine 1 000 mg Free-Form Neurotransmitter Support* 100 Veg Capsules
- Price
- $10.77
- Rating
- 4.6/5
- Reviews
- 6,256
- Age
- 17y ago

Life Extension Glycine 1000 mg Amino Acid that Promotes Healthy Sleep Gluten-Free Non-GMO Vegetarian 100 Capsules
- Price
- $11.59
- Rating
- 4.6/5
- Reviews
- 3,365
- Age
- 10y ago

THORNE - Glycine - Supports Relaxation Stress Management Detoxification & Healthy Muscle Function* - Amino Acid Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 250 Capsules
- Price
- $30.12
- Rating
- 4.6/5
- Reviews
- 1,472
- Age
- 18y ago

Pure Encapsulations Glycine - Supports Restful Sleep & Liver Detox* - Liver Supplement - Vegan & Gluten-Free - 180 Capsules
- Price
- $33.29
- Rating
- 4.6/5
- Reviews
- 921
- Age
- 19y ago

Nutricost Glycine Powder 1lb - Non-GMO Gluten Free
- Price
- $21.80
- Rating
- 4.6/5
- Reviews
- 1,593
- Age
- 4y ago
Trending
estimated 90-day click momentum
duwhot Glycine Gummies 3g(3000 mg) Glycine Supplements for Sleep Detox Relax Nerve Support Blueberry Flavor Sugar-Free Vegan Non-GMO Gluten-Free 60 Ct.
- Price
- $20.72
- Rating
- 4.5/5
- Reviews
- 121
- Age
- 8mo ago

Micro Ingredients Glycine Powder 1KG (2.2 Pounds) Glycine 1000mg Per Serving Water Soluble and Product of USA
- Price
- $29.01
- Rating
- 4.6/5
- Reviews
- 1,224
- Age
- 9y ago

NOW Foods Supplements Glycine 1 000 mg Free-Form Neurotransmitter Support* 100 Veg Capsules
- Price
- $10.77
- Rating
- 4.6/5
- Reviews
- 6,256
- Age
- 17y ago

Glycine Supplement - 1 000mg Glycine Powder per Serving (300 Capsules) The Relaxing Amino Acid (Glicina) (Third Party Tested Gluten Free Non-GMO) by Double Wood
- Price
- $19.32
- Rating
- 4.6/5
- Reviews
- 1,573
- Age
- 5y ago

Nutricost Glycine Powder 1lb - Non-GMO Gluten Free
- Price
- $21.80
- Rating
- 4.6/5
- Reviews
- 1,593
- Age
- 4y ago
Newest
by launch date
duwhot Glycine Gummies 3g(3000 mg) Glycine Supplements for Sleep Detox Relax Nerve Support Blueberry Flavor Sugar-Free Vegan Non-GMO Gluten-Free 60 Ct.
- Price
- $20.72
- Rating
- 4.5/5
- Reviews
- 121
- Age
- 8mo ago

Glycine 2 000mg Per Serving 240 Veggie Capsules | Free Form | Double Strength Amino Acids | Restful Sleep and Neurotransmitter Support Supplements | Non-GMO Gluten Free
- Price
- $16.13
- Rating
- 4.5/5
- Reviews
- 254
- Age
- 1y ago
![Puregen Labs Glycine 1000mg [High Potency] 100 Vegetarian Capsules Promotes Healthy Rest | No Harmful Additives | Non-GMO NO Gluten and Dairy -100 Servings](https://m.media-amazon.com/images/I/41L9QWe38BL.jpg)
Puregen Labs Glycine 1000mg [High Potency] 100 Vegetarian Capsules Promotes Healthy Rest | No Harmful Additives | Non-GMO NO Gluten and Dairy -100 Servings
- Price
- $9.89
- Rating
- 4.6/5
- Reviews
- 563
- Age
- 1y ago

Now Foods Glycine 1000mg Free-Form Pharmaceutical Grade Neurotransmitter Support* Promotes restful Sleep* Gluten Free Vegan Kosher 200 Vegetarian Capsules (Pack of 1)
- Price
- $22.98
- Rating
- 4.7/5
- Reviews
- 898
- Age
- 3y ago

BulkSupplements.com Glycine Capsules - Amino Acid Supplement 3000mg - Gluten Free 4 Capsules per Serving 360 Count (Pack of 1)
- Price
- $20.84
- Rating
- 4.5/5
- Reviews
- 758
- Age
- 3y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 65% of clicks. Leaders hold, but buyers still shop past them.
Brands
11 flat
Sellers
31
Est. top-5 brand share
75%
Top 20: 100%
Est. top-5 click share
65%
Top 20: 100%
Open market
14%
- NOW Foods22%
- Life Extension15%
- THORNE14%
- Pure Encapsulations13%
- Nutricost12%
- BulkSupplements11%
- Open — no brand owns it (5 brands, 14%)
Demand
Glycine search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 2.1×
Search terms
Top Glycine search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- glycine1.3M/yr
- glycine supplements348K/yr
- glicina74K/yr
- glycine 3g77K/yr
- glycine 3000mg34K/yr
- thorne glycine27K/yr
- glycine for sleep54K/yr
- glycine capsules28K/yr
- l glycine16K/yr
- now glycine19K/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 for sleep”
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.
21 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









