---
title: "Glycine 3g — $14K/mo Amazon US Product Research (2026)"
canonical_url: "https://flapen.com/research/us/health-household/glycine-3g"
last_updated: "2026-08-12T08:07:57.112Z"
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description: "Amazon product research for glycine 3g: $14K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:description": "Amazon product research for glycine 3g: $14K/mo market, demand, competition, pricing, reviews & the verdict. Know if it's worth selling — Flapen."
"og:title": "Glycine 3g — $14K/mo Amazon US Product Research (2026)"
---
# **Glycine 3g**
**Skip it**
Soft demand (-34.4% this quarter) — this niche doesn't clear our bar today.
Market size 35Growth 8Conversion 91Competition 27Returns 100Price range 77Avg price 86Brand share 50Review moat 50Quality gap 30
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****10.9%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$19.46**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$9.89–$33.21**
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****1,544.38**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Okay****$171K**
$171K/yr · 81K searches
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Growth**
**Bad****-34.4%**
90-day search growth — must beat 0% to launch
## **Is glycine 3g profitable on Amazon?**
According to Flapen's Amazon United States niche tracking, glycine 3g is a $171K/yr Amazon United States market (81K searches/yr). The top 5 brands hold 75% of demand. Demand peaks in Jan–Feb–Mar–Dec. Verdict: Skip it — 48/100.
Data updated Jul 10, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **glycine 3g market size & sales**
Units sold, revenue, conversion and listing quality across the tracked shelf.
- **Units sold / yr**
- **10K–13K**
- avg 500–750/product
- **Revenue / yr**
- **$195K–$243K**
- units × avg price
- **Conversion rate**
- **10.9%**
- **Avg BSR**
- **#751**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **88%**
- **Out of stock**
- **2.9%**
- **Avg brand age**
- **63 months**
- **Avg seller age**
- **188 days**
## **Competition: brands, sellers & click share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▲rising
**Sellers**
**31**
**Top-5 brand share**
**75%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**17%**
- Pure Encapsulations26% - THORNE16% - BulkSupplements13% - NOW Foods11% - Nutricost9% - Life Extension8% - Open — no brand owns it (7 brands, 17%)
## **glycine 3g demand & seasonality**
Weekly Amazon search volume, last 53 weeks — -34.4% search growth over the last 90 days.
3K2KSpike '25Black Friday '25Holiday '25Spike '26 seasonJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Jan, Feb, Mar, Dec · busiest ÷ quietest = 3.8×
[**Open Trend **](https://flapen.com/research/us/health-household/glycine-3g/trend)
## **Top glycine 3g products & what they sell for**
Every tracked product — its share of the shelf, its review moat, and what it sells for.
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$17K20%$34K30%$51K40%$69K101001K10K 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**Pure Encapsulations Glycine - Supports Restful Sleep & Liver Detox* - Liver Supplement - Vegan & Gluten-Free - 180 Capsules**Pure Encapsulations**$33.21**4.6★903 rev](https://www.amazon.com/dp/B0016BX8O2) [2**THORNE - Glycine - Supports Relaxation Stress Management Detoxification & Healthy Muscle Function* - Amino Acid Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 250 Capsules**THORNE**$30.06**4.6★1,452 rev](https://www.amazon.com/dp/B000VYRROC) [3**BulkSupplements.com Glycine Capsules - Amino Acid Supplement 3000mg - Gluten Free 4 Capsules per Serving 360 Count (Pack of 1)**BulkSupplements**$20.81**4.4★719 rev](https://www.amazon.com/dp/B0BNSW4ZDQ) [4**Nutricost Glycine Powder 1lb - Non-GMO Gluten Free**Nutricost**$21.75**4.6★1,555 rev](https://www.amazon.com/dp/B09F83CPX8) [5**Life Extension Glycine 1000 mg Amino Acid that Promotes Healthy Sleep Gluten-Free Non-GMO Vegetarian 100 Capsules**Life Extension**$11.59**4.6★3,334 rev](https://www.amazon.com/dp/B00B35A394)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Innate Vitality Glycine Supplements 3000mg per Serving Bioavailable Form Sleep Relax Collagen Glutathione Production Non-GMO Conditionally Essential Amino Acids Vegan 240 Capsules**Innate Vitality**$24.95**44 rev5mo ago](https://www.amazon.com/dp/B0FMHJ71G1) [**HOLLEGEND Glycine 3g Gummies Organic L-Glycine with NAC Supplements for Sleep & Cellular Support Plus B6 L-Theanine & Taurine for Nerve Liver Detox & Immune Health Sugar Free Vegan 60 Chews**HOLLEGEND**$21.66**54 rev6mo ago](https://www.amazon.com/dp/B0GD5JFCJC) [**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**$20.78**113 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**$15.93**245 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**545 rev1y ago](https://www.amazon.com/dp/B0DDQVTZ8Y)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**HOLLEGEND Glycine 3g Gummies Organic L-Glycine with NAC Supplements for Sleep & Cellular Support Plus B6 L-Theanine & Taurine for Nerve Liver Detox & Immune Health Sugar Free Vegan 60 Chews**HOLLEGEND**$21.66**4.5★**▲ 155%**](https://www.amazon.com/dp/B0GD5JFCJC) [**Innate Vitality Glycine Supplements 3000mg per Serving Bioavailable Form Sleep Relax Collagen Glutathione Production Non-GMO Conditionally Essential Amino Acids Vegan 240 Capsules**Innate Vitality**$24.95**4.9★**▲ 130%**](https://www.amazon.com/dp/B0FMHJ71G1) [**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**$20.78**4.4★**▲ 53%**](https://www.amazon.com/dp/B0FYWRYY2V) [**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**$19.26**4.6★**▲ 49%**](https://www.amazon.com/dp/B08FCRJW9V) [**Nutricost Glycine Powder 1lb - Non-GMO Gluten Free**Nutricost**$21.75**4.6★**▲ 25%**](https://www.amazon.com/dp/B09F83CPX8)
**~~View all trending →~~**
## **What reviews say buyers love and hate about glycine 3g**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**29%
*“Helps me sleep”*
**Quality-Overall**12%
*“Quality products Good price Quick Delivery”*
**Value For Money**5%
*“Great value”*
**Taste-Overall**5%
*“no funky aftertaste”*
**Vitamin**4%
*“Good quality vitamins”*
**Solubility**2%
*“It dissolves super easily”*
**Sweetness**2%
*“Tastes slightly sweet”*
**Nutritional Content**2%
*“Best Supplement Out There”*
**Dosage**2%
*“with a good amount per capsule”*
**Stress/Anxiety**2%
*“Effective in reducing stress”*
### **What buyers complain about **
**Sleep Quality**19%
*“Did not help with sleep”*
**Functionality-Overall**8%
*“Didn't work for me”*
**Dosage**6%
*“The dosage is not clearly listed on the sales page”*
**Quality-Overall**6%
*“Poor Quality Control”*
**Solubility**5%
*“Does not dissolve”*
**Taste-Overall**4%
*“Completely different taste”*
**Side Effects**4%
*“Now I have dizziness and vertigo”*
**Smell**4%
*“Chemical Smell”*
**Value For Money**2%
*“Too Expensive - glycine is glycine”*
**Stress/Anxiety**2%
*“My next day was wrecked with exhaustion”*
### **Top return reasons **
**Sleep Quality**24%
**Functionality-Overall**18%
**Dosage**12%
**Hard Feel**6%
**Advertised Vs Actual Product**6%
**Muscle Pain Relief**6%
**Blood Sugar Level**6%
**Acid Regulator/Stomach Ache Relief**6%
**Calcium**6%
**Adhesion/Stickiness**6%
## **Common glycine 3g questions**
- **Is glycine 3g profitable to sell on Amazon United States?**
- The niche generates $171K/yr across 16 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is -34.4%. Flapen's verdict: Skip it (48/100).
- **How competitive is the glycine 3g niche?**
- 13 brands and 31 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 75% of demand.
- **What do buyers complain about in glycine 3g?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for glycine 3g peak?**
- Demand peaks in Jan–Feb–Mar–Dec; the busiest month runs 3.8× the quietest.
- **What does it cost to enter the glycine 3g niche?**
- Listings span $9.89–$33.21; the average listing price is $19.46 (sweet spot $15–$100). The average incumbent carries 1,544 reviews — the moat a new listing must climb.
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