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Glycine

Maybe

An estimated 0.0% of orders come back. But demand is soft, at -15.6% this quarter, so Glycine is a Maybe.

Flapen Score
61
61 / 100
Top 9% of 14,768 Health & Household niches · +12 vs the category median of 49
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.

61Maybe
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

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

Every tracked product: its share of the shelf, its reviews, and its price.

Sign in to see the products

The products selling in this niche are for signed-in readers. Every market figure above stays open to everyone.

Competition

Competition: brands, sellers & click share

The top 5 products take 65% of clicks. Leaders hold, but buyers still shop past them.

Brands

11 flat

Sellers

31

Top-5 brand share

75%

Top 20: 100%

Top-5 click share

65%

Top 20: 100%

Open market

14%

  • Brand 122%
  • Brand 215%
  • Brand 314%
  • Brand 413%
  • Brand 512%
  • Brand 611%
  • Open — no brand owns it (5 brands, 14%)

Demand

Glycine search demand

Weekly searches over the year, seasonality beneath. Pick a range.

50K30KSpike '24Spike '25Holiday '25DecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 2.1×

Search terms

Top Glycine search terms shoppers use

The exact words shoppers type, with 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.

32%of positive reviews mention “Sleep Quality”
18%of negative reviews mention “Sleep Quality”
<0.1%of orders come back, a rate Amazon rounds to zero
“Not for sleep”
A buyer, on “Sleep Quality”18% of negative reviews mention the same topic

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

NegativePositive

FAQ

Common Glycine questions

Answered from the same tracked data.