---
title: "guaifenesin 400mg — Niche Verdict: Skip it (35/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/health-household/guaifenesin-400mg"
last_updated: "2026-07-14T03:50:16.768Z"
locale: en
meta:
  description: "prices mostly outside the sweet spot ($5.26–$14.65) — guaifenesin 400mg doesn't clear our bar today."
  "og:description": "prices mostly outside the sweet spot ($5.26–$14.65) — guaifenesin 400mg doesn't clear our bar today."
  "og:title": "guaifenesin 400mg — Niche Verdict: Skip it (35/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **guaifenesin 400mg**

**Skip it**

Prices mostly outside the sweet spot ($5.26–$14.65) — this niche doesn't clear our bar today.

Market size 23Growth 20Conversion 100Competition 14Returns 100Price range 0Avg price 36Brand share 12Review moat 24Quality gap 25

**Conversion**

**Incredible****21.5%**

search→purchase rate — share of searches ending in a sale

**Returns**

**Incredible****0.0%**

return rate — above 6% kills the launch gate

**Avg price**

**Okay****$10.34**

avg listing price — sweet spot $15–$100

**Quality gap**

**Okay****4.6★**

avg incumbent rating — lower means beatable quality

**Review moat**

**Bad****4,947.5**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Bad****$91K**

$91K/yr · 41K searches

**Growth**

**Bad****-10.0%**

90-day search growth — must beat 0% to launch

**Competition**

**Bad****84%**

top-5 click share — a locked-up shelf

**Brand share**

**Bad****95%**

top-5 brand share — brand-locked demand

**Price range**

**Bad****$5.26–$14.65**

cheapest to priciest tracked listing — scored on the share inside $15–$100

## **Competition**

The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**7 **—flat

**Sellers**

**10**

**Top-5 brand share**

**95%**

**Open market**

**2%**

- HEALTH LFE37% - GenCare24% - HealthA2Z20% - ValuMeds10% - Safrel5% - NewVue3% - Open — no brand owns it (1 brand, 2%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$9K20%$18K30%$27K40%$36K1001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![HEALTH LFE Mucus Relief Guaifenesin Caplets 400 mg Immediate Release Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu (Medium 200 Count)](https://m.media-amazon.com/images/I/417DP5+A5VL.jpg)**HEALTH LFE Mucus Relief Guaifenesin Caplets 400 mg Immediate Release Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu (Medium 200 Count)**HEALTH LFE**$9.90**4.6★3,317 rev](https://www.amazon.com/dp/B09PSS48D2) [2![HealthA2Z Mucus Relief Guaifenesin 400mg 300 Counts Dye Free No Benzene Immediate Release Expectorant](https://m.media-amazon.com/images/I/41JkpCFTSTL.jpg)**HealthA2Z Mucus Relief Guaifenesin 400mg 300 Counts Dye Free No Benzene Immediate Release Expectorant**HealthA2Z**$14.65**4.6★6,328 rev](https://www.amazon.com/dp/B074R7QJ8K) [3![GenCare Mucus Relief Expectorant Guaifenesin 400 mg 200 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies](https://m.media-amazon.com/images/I/41usG-82bjL.jpg)**GenCare Mucus Relief Expectorant Guaifenesin 400 mg 200 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies**GenCare**$9.90**4.6★9,209 rev](https://www.amazon.com/dp/B086S3P4FQ) [4![ValuMeds Mucus Relief Guaifenesin 400mg (200 Caplets) | Maximum Strength | Mucus Thinning for Colds Chest Congestion Flu Coughing | Expectorant & Decongestant](https://m.media-amazon.com/images/I/41Ip7N-C0SL.jpg)**ValuMeds Mucus Relief Guaifenesin 400mg (200 Caplets) | Maximum Strength | Mucus Thinning for Colds Chest Congestion Flu Coughing | Expectorant & Decongestant**ValuMeds**$8.23**4.6★4,830 rev](https://www.amazon.com/dp/B07RYZ9JDJ) [5![GenCare Mucus Relief Expectorant Guaifenesin 400 mg 300 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies](https://m.media-amazon.com/images/I/41eBF1o6WyL.jpg)**GenCare Mucus Relief Expectorant Guaifenesin 400 mg 300 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies**GenCare**$12.84**4.6★9,209 rev](https://www.amazon.com/dp/B0DGRMD8LS)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![NewVue Mucus Relief Guaifenesin 400mg Powerful Expectorant Loosens & Thins Mucus Cough Relief Compare to Mucinex Active Ingredients (Small 300 Count)](https://m.media-amazon.com/images/I/41FqamECB4L.jpg)**NewVue Mucus Relief Guaifenesin 400mg Powerful Expectorant Loosens & Thins Mucus Cough Relief Compare to Mucinex Active Ingredients (Small 300 Count)**NewVue**$11.84**118 rev2y ago](https://www.amazon.com/dp/B0CQHZK9YM) [![HealthA2Z Mucus Relief | Guaifenesin 400mg | Immediate Release | No Benzene | Expectorant (60 Counts)](https://m.media-amazon.com/images/I/41Hg1NOPgNL.jpg)**HealthA2Z Mucus Relief | Guaifenesin 400mg | Immediate Release | No Benzene | Expectorant (60 Counts)**HealthA2Z**$5.26**6,328 rev3y ago](https://www.amazon.com/dp/B09ZQ2N12H) [![HEALTH LFE Mucus Relief Guaifenesin Caplets 400 mg Immediate Release Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu (Medium 200 Count)](https://m.media-amazon.com/images/I/417DP5+A5VL.jpg)**HEALTH LFE Mucus Relief Guaifenesin Caplets 400 mg Immediate Release Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu (Medium 200 Count)**HEALTH LFE**$9.90**3,317 rev4y ago](https://www.amazon.com/dp/B09PSS48D2) [![HealthLife Mucus Relief Guaifenesin Caplets 400 mg Immediate Release (300 Count) Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu](https://m.media-amazon.com/images/I/41+VMlmfOXL.jpg)**HealthLife Mucus Relief Guaifenesin Caplets 400 mg Immediate Release (300 Count) Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu**HEALTH LFE**$13.28**3,317 rev5y ago](https://www.amazon.com/dp/B097NKSPSS) [![Safrel | Guaifenesin Expectorant | 400 mg | Tablets | 200 Count | Thins and Loosens Mucus | Chest Congestion Support](https://m.media-amazon.com/images/I/41TQK5mVBHL.jpg)**Safrel | Guaifenesin Expectorant | 400 mg | Tablets | 200 Count | Thins and Loosens Mucus | Chest Congestion Support**Safrel**$9.54**4,021 rev5y ago](https://www.amazon.com/dp/B08HMQ7JDY)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![NewVue Mucus Relief Guaifenesin 400mg Powerful Expectorant Loosens & Thins Mucus Cough Relief Compare to Mucinex Active Ingredients (Small 300 Count)](https://m.media-amazon.com/images/I/41FqamECB4L.jpg)**NewVue Mucus Relief Guaifenesin 400mg Powerful Expectorant Loosens & Thins Mucus Cough Relief Compare to Mucinex Active Ingredients (Small 300 Count)**NewVue**$11.84**4.6★**▲ 271%**](https://www.amazon.com/dp/B0CQHZK9YM) [![GenCare Mucus Relief Expectorant Guaifenesin 400 mg 300 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies](https://m.media-amazon.com/images/I/41eBF1o6WyL.jpg)**GenCare Mucus Relief Expectorant Guaifenesin 400 mg 300 Tablets Value Pack - Fast Acting Thinning of Mucus for Colds Chest Congestion Flu Coughing and Allergies**GenCare**$12.84**4.6★**▲ 91%**](https://www.amazon.com/dp/B0DGRMD8LS) [![HealthLife Mucus Relief Guaifenesin Caplets 400 mg Immediate Release (300 Count) Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu](https://m.media-amazon.com/images/I/41+VMlmfOXL.jpg)**HealthLife Mucus Relief Guaifenesin Caplets 400 mg Immediate Release (300 Count) Fast Acting Expectorant Thin and Loosens Mucus Relieves Chest Congestion Cough Cold and Flu**HEALTH LFE**$13.28**4.6★**▲ 16%**](https://www.amazon.com/dp/B097NKSPSS) [![HealthA2Z Mucus Relief Guaifenesin 400mg 300 Counts Dye Free No Benzene Immediate Release Expectorant](https://m.media-amazon.com/images/I/41JkpCFTSTL.jpg)**HealthA2Z Mucus Relief Guaifenesin 400mg 300 Counts Dye Free No Benzene Immediate Release Expectorant**HealthA2Z**$14.65**4.6★**— 6%**](https://www.amazon.com/dp/B074R7QJ8K) [![Safrel | Guaifenesin Expectorant | 400 mg | Tablets | 200 Count | Thins and Loosens Mucus | Chest Congestion Support](https://m.media-amazon.com/images/I/41TQK5mVBHL.jpg)**Safrel | Guaifenesin Expectorant | 400 mg | Tablets | 200 Count | Thins and Loosens Mucus | Chest Congestion Support**Safrel**$9.54**4.6★**— 3%**](https://www.amazon.com/dp/B08HMQ7JDY)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -10.0% search growth over the last 90 days.

1K600Prime Day '24Spike '25Holiday '25Spike '26 seasonSepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.4×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Value For Money**32%

*“Great deal”*

**Efficiency**14%

*“Works well”*

**Quality-Overall**13%

*“This brand seems just as effective as others I have tried”*

**Cough Relief**6%

*“Works well for sinus/chest congestion”*

**Advertised Vs Actual Product**5%

*“Works as Advertised”*

**Dosage**4%

*“I HAVE USED THE 400MG AND IS GOOD ENOUGH FOR ME”*

**Ease Of Chewing/Swallowing**3%

*“Very effective, the pill is relatively small compared with other brands and they are shaped well for easy swallowing”*

**Sleep Quality**2%

*“Day/Night Time Relief”*

**Breathability**2%

*“my breathing is much better”*

**Cold Relief**2%

*“a must-have for colds or allergies”*

### **What buyers complain about **

**Dosage**15%

*“Incorrect dosage instructions”*

**Size-Overall**11%

*“Why is the bottle so big”*

**Taste-Overall**8%

*“Tastes horrible”*

**Functionality-Overall**7%

*“This product does not help much”*

**Advertised Vs Actual Product**7%

*“Not as described”*

**Acid Regulator/Stomach Ache Relief**5%

*“My niece has a problem with congestion”*

**Allergies**5%

*“Take THAT, allergies”*

**Ease Of Chewing/Swallowing**5%

*“Hard To Swallow”*

**Side Effects**4%

*“It made me so nauseous that I couldnt take it anymore”*

**Moist/Dry**3%

*“Dries up mucus”*