glycine 3g
Skip itSoft demand (-34.4% this quarter) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 6% kills the launch gate
Conversion
Great10.9%search→purchase rate — share of searches ending in a sale
Avg price
Great$19.46avg listing price — sweet spot $15–$100
Price range
Great$9.89–$33.21cheapest to priciest tracked listing — scored on the share inside $15–$100
Brand share
Good75%top-5 brand share — brands hold most of the demand
Review moat
Okay1,544.38avg incumbent reviews — the moat a new listing must climb
Market size
Okay$171K$171K/yr · 81K searches
Quality gap
Okay4.6★avg incumbent rating — lower means beatable quality
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Growth
Bad-34.4%90-day search growth — must beat 0% to launch
Competition
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%
Open market
17%
- Pure Encapsulations26%
- THORNE16%
- BulkSupplements13%
- NOW Foods11%
- Nutricost9%
- Life Extension8%
- Open — no brand owns it (7 brands, 17%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Pure Encapsulations Glycine - Supports Restful Sleep & Liver Detox* - Liver Supplement - Vegan & Gluten-Free - 180 Capsules
Pure Encapsulations$33.214.6★903 rev
THORNE - Glycine - Supports Relaxation Stress Management Detoxification & Healthy Muscle Function* - Amino Acid Supplement - Third-Party Certified - Gluten Dairy & Soy-Free - 250 Capsules
THORNE$30.064.6★1,452 rev
BulkSupplements.com Glycine Capsules - Amino Acid Supplement 3000mg - Gluten Free 4 Capsules per Serving 360 Count (Pack of 1)
BulkSupplements$20.814.4★719 rev
Nutricost Glycine Powder 1lb - Non-GMO Gluten Free
Nutricost$21.754.6★1,555 rev
Life Extension Glycine 1000 mg Amino Acid that Promotes Healthy Sleep Gluten-Free Non-GMO Vegetarian 100 Capsules
Life Extension$11.594.6★3,334 rev
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$24.9544 rev
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$21.6654 rev
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$20.78113 rev
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$15.93245 rev
![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$9.89545 rev
Trending
90-day click momentumHOLLEGEND 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$21.664.5★
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$24.954.9★
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$20.784.4★
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$19.264.6★
Nutricost Glycine Powder 1lb - Non-GMO Gluten Free
Nutricost$21.754.6★
Demand & seasonality
Weekly Amazon search volume, last 53 weeks — -34.4% search growth over the last 90 days.Peak months: Jan, Feb, Mar, Dec · busiest ÷ quietest = 3.8×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Helps me sleep”
“Quality products Good price Quick Delivery”
“Great value”
“no funky aftertaste”
“Good quality vitamins”
“It dissolves super easily”
“Tastes slightly sweet”
“Best Supplement Out There”
“with a good amount per capsule”
“Effective in reducing stress”
What buyers complain about
“Did not help with sleep”
“Didn't work for me”
“The dosage is not clearly listed on the sales page”
“Poor Quality Control”
“Does not dissolve”
“Completely different taste”
“Now I have dizziness and vertigo”
“Chemical Smell”
“Too Expensive - glycine is glycine”
“My next day was wrecked with exhaustion”