---
title: "Glycine — $6.2M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/glycine"
last_updated: "2026-08-12T03:23:37.885Z"
locale: en
meta:
description: "Niche score 61/100 · $6.2M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 61/100 · $6.2M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Glycine — $6.2M/yr Amazon US Niche (2026) - Flapen"
---
# **glycine**
**Worth a look**
Shows low returns (0.0%), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 99Growth 17Conversion 97Competition 33Returns 100Price range 78Avg price 86Brand share 50Review moat 48Quality gap 28
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Market size**
**Incredible****$6.2M**
$6.2M/yr · 2.1M searches
**Conversion**
**Incredible****15.6%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$19.40**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.89–$33.29**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Good****75%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Okay****1,701.06**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Okay****65%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-15.6%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, glycine is a $6.2M/yr Amazon United States market (2.1M searches/yr). The top 5 brands hold 75% of demand. Verdict: Worth a look — 61/100.
Data updated Jul 25, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **glycine market data**
- **Units sold / yr**
- **300K–400K**
- avg 15,000–20,000/product
- **Revenue / yr**
- **$5.8M–$7.8M**
- units × avg price
- **Conversion rate**
- **15.6%**
- **Avg BSR**
- **#434**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **1.7%**
- **Avg brand age**
- **56 months**
- **Avg seller age**
- **152 days**
## **Competition & brand share**
The top 5 products take 65% of clicks — established leaders, but buyers still shop beyond 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%**
- NOW Foods22% - Life Extension15% - THORNE14% - Pure Encapsulations13% - Nutricost12% - BulkSupplements11% - Open — no brand owns it (5 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 99 weeks — -15.6% search growth over the last 90 days.
50K30KSpike '24Spike '25Holiday '25 seasonDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 2.1×
[**Open Trend **](https://flapen.com/research/us/health-household/glycine/trend)
## **Top glycine search terms**
- **glycine**1.3M/yr-14.7%14.5% conv. - **glycine supplements**348K/yr-28.1%12.3% conv. - **glicina**74K/yr+55.7%3.5% conv. - **glycine 3g**77K/yr-32.9%10.8% conv. - **glycine 3000mg**34K/yr+2.8%10.8% conv. - **thorne glycine**27K/yr-8.9%23.6% conv. - **glycine for sleep**54K/yr-52.6%11.6% conv. - **glycine capsules**28K/yr-5.9%11.4% conv. - **l glycine**16K/yr+18.3%13.3% conv. - **now glycine**19K/yr-21.1%18.0% conv. [**All search terms **](https://flapen.com/research/us/health-household/glycine/search-terms)
## **Top glycine products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%4%$249K8%$498K12%$747K16%$996K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**NOW Foods Supplements Glycine 1 000 mg Free-Form Neurotransmitter Support* 100 Veg Capsules**NOW Foods**$10.77**4.6★6,256 rev](https://www.amazon.com/dp/B002J0RHTQ) [2**Life Extension Glycine 1000 mg Amino Acid that Promotes Healthy Sleep Gluten-Free Non-GMO Vegetarian 100 Capsules**Life Extension**$11.59**4.6★3,365 rev](https://www.amazon.com/dp/B00B35A394) [3**THORNE - Glycine - Supports Relaxation Stress Management Detoxification & Healthy Muscle Function* - Amino Acid Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 250 Capsules**THORNE**$30.12**4.6★1,472 rev](https://www.amazon.com/dp/B000VYRROC) [4**Pure Encapsulations Glycine - Supports Restful Sleep & Liver Detox* - Liver Supplement - Vegan & Gluten-Free - 180 Capsules**Pure Encapsulations**$33.29**4.6★921 rev](https://www.amazon.com/dp/B0016BX8O2) [5**Nutricost Glycine Powder 1lb - Non-GMO Gluten Free**Nutricost**$21.80**4.6★1,593 rev](https://www.amazon.com/dp/B09F83CPX8)
**~~View all top sellers →~~**
### **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.**duwhot**$20.72**121 rev8mo ago](https://www.amazon.com/dp/B0FYWRYY2V) [**Glycine 2 000mg Per Serving 240 Veggie Capsules | Free Form | Double Strength Amino Acids | Restful Sleep and Neurotransmitter Support Supplements | Non-GMO Gluten Free**Micro Ingredients**$16.13**254 rev1y ago](https://www.amazon.com/dp/B0DW1BXPMV) [![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**P Puregen Labs**$9.89**563 rev1y ago](https://www.amazon.com/dp/B0DDQVTZ8Y) [**Now Foods Glycine 1000mg Free-Form Pharmaceutical Grade Neurotransmitter Support* Promotes restful Sleep* Gluten Free Vegan Kosher 200 Vegetarian Capsules (Pack of 1)**NOW Foods**$22.98**898 rev3y ago](https://www.amazon.com/dp/B0BSB576NM) [**BulkSupplements.com Glycine Capsules - Amino Acid Supplement 3000mg - Gluten Free 4 Capsules per Serving 360 Count (Pack of 1)**BulkSupplements**$20.84**758 rev3y ago](https://www.amazon.com/dp/B0BNSW4ZDQ)
**~~View all new products →~~**
### **Trending**
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.**duwhot**$20.72**4.5★**▲ 55%**](https://www.amazon.com/dp/B0FYWRYY2V) [**Micro Ingredients Glycine Powder 1KG (2.2 Pounds) Glycine 1000mg Per Serving Water Soluble and Product of USA**Micro Ingredients**$29.01**4.6★**▲ 18%**](https://www.amazon.com/dp/B01LBILPCG) [**NOW Foods Supplements Glycine 1 000 mg Free-Form Neurotransmitter Support* 100 Veg Capsules**NOW Foods**$10.77**4.6★**▲ 17%**](https://www.amazon.com/dp/B002J0RHTQ) [**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**Double Wood Supplements**$19.32**4.6★**▲ 16%**](https://www.amazon.com/dp/B08FCRJW9V) [**Nutricost Glycine Powder 1lb - Non-GMO Gluten Free**Nutricost**$21.80**4.6★**▲ 12%**](https://www.amazon.com/dp/B09F83CPX8)
**~~View all trending →~~**
## **What buyers say about glycine**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**32%
*“Helps me sleep”*
**Quality-Overall**13%
*“quality seems consistent”*
**Value For Money**5%
*“Great value”*
**Taste-Overall**5%
*“no funky aftertaste”*
**Vitamin**4%
*“NOW Vitamins - Good Quality Brand”*
**Solubility**3%
*“It dissolves super easily”*
**Sweetness**2%
*“It has a pleasant slightly sweet taste”*
**Nutritional Content**2%
*“that it would be good for making protein ice cream”*
**Advertised Vs Actual Product**2%
*“As advertised”*
**Dosage**2%
*“Great 1000mg dosage”*
### **What buyers complain about **
**Sleep Quality**18%
*“Not for sleep”*
**Functionality-Overall**8%
*“Didn't work for me”*
**Dosage**6%
*“Not even half that many servings at the advertised dosage”*
**Quality-Overall**6%
*“Poor Quality Control”*
**Taste-Overall**5%
*“Taste is horrible”*
**Solubility**5%
*“it did not dissolve”*
**Smell**4%
*“Chemical Smell”*
**Side Effects**4%
*“Now I have dizziness and vertigo”*
**Size-Overall**2%
*“The capsule is big”*
**Stress/Anxiety**2%
*“My next day was wrecked with exhaustion”*
### **Top return reasons **
**Sleep Quality**26%
**Functionality-Overall**21%
**Dosage**11%
**Muscle Pain Relief**5%
**Advertised Vs Actual Product**5%
**Calcium**5%
**Acid Regulator/Stomach Ache Relief**5%
**Blood Sugar Level**5%
**Adhesion/Stickiness**5%
**Hard Feel**5%
## **Common questions**
- **Is glycine profitable to sell on Amazon United States?**
- The niche generates $6.2M/yr across 16 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -15.6%. Flapen's verdict: Worth a look (61/100).
- **How competitive is the glycine niche?**
- 11 brands and 31 sellers compete. The top 5 products take 65% of clicks and top 5 brands hold 75% of demand.
- **What do buyers complain about in glycine?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for glycine peak?**
- Demand is steady year-round — the busiest month runs 2.1× the quietest.
- **What does it cost to enter the glycine niche?**
- Listings span $9.89–$33.29; the average listing price is $19.40 (sweet spot $15–$100). The average incumbent carries 1,701 reviews — the moat a new listing must climb.
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