---
title: "Diphenhydramine 50mg 1000 Capsules — $9K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/health-household/diphenhydramine-50mg-1000-capsules"
last_updated: "2026-08-11T09:07:00.963Z"
locale: en
meta:
description: "Niche score 41/100 · $9K/yr market · 2K searches/yr · $17.47 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $9K/yr market · 2K searches/yr · $17.47 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Diphenhydramine 50mg 1000 Capsules — $9K/yr Amazon US Niche (2026) - Flapen"
---
# **diphenhydramine 50mg 1000 capsules**
**Skip it**
A small market ($9K/yr) — this niche doesn't clear our bar today.
Market size 2Growth 21Conversion 100Competition 17Returns 100Price range 75Avg price 81Brand share 43Review moat 24Quality gap 17
**Conversion**
**Incredible****20.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.0%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$17.47**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$10.07–$29.46**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Bad****5,616.33**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Bad****-7.7%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****79%**
top-5 click share — a locked-up shelf
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$9K**
$9K/yr · 2K searches
According to Flapen's Amazon United States niche tracking, diphenhydramine 50mg 1000 capsules is a $9K/yr Amazon United States market (2K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in May. Verdict: Skip it — 41/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **diphenhydramine 50mg 1000 capsules market data**
- **Units sold / yr**
- **250–500**
- avg 0–100/product
- **Revenue / yr**
- **$4K–$9K**
- units × avg price
- **Conversion rate**
- **20.7%**
- **Avg BSR**
- **#192**
- **Page quality**
- **0%**
- **Prime**
- **89%**
- **Sponsored**
- **89%**
- **Out of stock**
- **10.4%**
- **Avg brand age**
- **84 months**
- **Avg seller age**
- **192 days**
## **Competition & brand share**
The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**9 **▲rising
**Sellers**
**14**
**Top-5 brand share**
**79%**
Top 20: 100%
**Top-5 click share**
**79%**
Top 20: 100%
**Open market**
**15%**
- WELMATE26% - SDA LABORATORIES21% - Wonder Laboratories13% - P Puregen Labs11% - HEALTH LFE8% - GenCare6% - Open — no brand owns it (3 brands, 15%)
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — -7.7% search growth over the last 90 days.
225175Prime Day '24Spike '24Spike '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: May · busiest ÷ quietest = 3.2×
[**Open Trend **](https://flapen.com/research/us/health-household/diphenhydramine-50mg-1000-capsules/trend)
## **Top diphenhydramine 50mg 1000 capsules 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%10%$88520%$2K30%$3K40%$4K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 9 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat**WELMATE**$24.63**4.7★677 rev](https://www.amazon.com/dp/B0CFG6Y9WK) [2**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Fast-Acting Indoor & Outdoor Antihistamine Symptom Control 1000 Count (1 Bottle)**SDA LABORATORIES**$29.46**4.8★944 rev](https://www.amazon.com/dp/B001KY9H36) [3**Wonder Laboratories Pharbedryl Diphenhydramine HCI 50 Mg Allergy Medicine and Antihistamine y - 1000 Capsules #3639**Wonder Laboratories**$22.67**4.8★45 rev](https://www.amazon.com/dp/B00080FO0I) [4**Puregen Labs Diphenhydramine HCl 50 mg Capsules 1000 Count Antihistamine I Allergy & Cold Symptoms Relief - Sneezing Runny Nose Itchy Eyes & Throat**P Puregen Labs**$24.76**5.0★5 rev](https://www.amazon.com/dp/B0GZJ3S283) [5**HEALTH LFE Allergy Relief Medicine Diphenhydramine HCl Caplets 25 mg | Children and Adults | Relieves Sneezing Runny Nose Hay Fever Symptoms Itchy Eyes and Throat (Large 1000 Count)**HEALTH LFE**$10.12**4.8★2,715 rev](https://www.amazon.com/dp/B0977CZ4Q3)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Puregen Labs Diphenhydramine HCl 50 mg Capsules 1000 Count Antihistamine I Allergy & Cold Symptoms Relief - Sneezing Runny Nose Itchy Eyes & Throat**P Puregen Labs**$24.76**5 rev2mo ago](https://www.amazon.com/dp/B0GZJ3S283) [**WELMATE Allergy Relief - Diphenhydramine 50 mg - 1000 Count Capsules - Antihistamine - Allergy & Cold Symptoms - Sneezing Runny Nose Itchy Eyes & Throat**WELMATE**$24.63**677 rev2y ago](https://www.amazon.com/dp/B0CFG6Y9WK) [**RIGHT REMEDIES Nighttime Sleep Aid Softgels (275 softgels) Diphenhydramine HCI 50 mg Fall Asleep Fast Supports Deeper Restful Sleep**RIGHT REMEDIES**$11.09**1,292 rev3y ago](https://www.amazon.com/dp/B0BCHDLBM9) [**MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA**Generic**$10.33**1,330 rev3y ago](https://www.amazon.com/dp/B0B86KXZR3) [**HEALTH LFE Allergy Relief Medicine Diphenhydramine HCl Caplets 25 mg | Children and Adults | Relieves Sneezing Runny Nose Hay Fever Symptoms Itchy Eyes and Throat (Large 1000 Count)**HEALTH LFE**$10.12**2,715 rev5y ago](https://www.amazon.com/dp/B0977CZ4Q3)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Puregen Labs Diphenhydramine HCl 50 mg Capsules 1000 Count Antihistamine I Allergy & Cold Symptoms Relief - Sneezing Runny Nose Itchy Eyes & Throat**P Puregen Labs**$24.76**5.0★**▲ 175%**](https://www.amazon.com/dp/B0GZJ3S283) [**RIGHT REMEDIES Nighttime Sleep Aid Softgels (275 softgels) Diphenhydramine HCI 50 mg Fall Asleep Fast Supports Deeper Restful Sleep**RIGHT REMEDIES**$11.09**4.4★**▲ 68%**](https://www.amazon.com/dp/B0BCHDLBM9) [**SDA LABORATORIES Diphenhydramine 50mg Allergy Relief Fast-Acting Indoor & Outdoor Antihistamine Symptom Control 1000 Count (1 Bottle)**SDA LABORATORIES**$29.46**4.8★**▲ 18%**](https://www.amazon.com/dp/B001KY9H36) [**GenCare Allergy Relief Medicine Bulk Value 1000 Count Diphenhydramine 25mg Antihistamines for Adults for Congestion Sneezing Runny Nose Itchy Eyes & Throat Pink**GenCare**$14.05**4.8★**— 3%**](https://www.amazon.com/dp/B088F4QMST) [**MedPlus Allergy Relief Medicine Diphenhydramine HCl 25 mg 1000 Tablets Antihistamine Relief for Indoor & Outdoor Allergies Made in USA**Generic**$10.33**4.8★**— 5%**](https://www.amazon.com/dp/B0B86KXZR3)
**~~View all trending →~~**
## **What buyers say about diphenhydramine 50mg 1000 capsules**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Sleep Quality**30%
*“Great night sleep”*
**Value For Money**25%
*“Fair price”*
**Quality-Overall**9%
*“the tablets have been consistent in quality”*
**Efficiency**6%
*“Works just as intended”*
**Advertised Vs Actual Product**4%
*“Just as advertised”*
**Dosage**4%
*“Use it daily”*
**Allergies**4%
*“These are perfect for allergies”*
**Ease Of Chewing/Swallowing**3%
*“I swallowed them fine”*
**Side Effects**1%
*“have no side effects”*
**Ease Of Use**1%
*“Works well easy to take works within 30 minutes”*
### **What buyers complain about **
**Sleep Quality**23%
*“Now I won't sleep at all”*
**Functionality-Overall**16%
*“Didn't work for me”*
**Dosage**7%
*“These pills do not work at all”*
**Allergies**7%
*“Weird reaction”*
**Taste-Overall**3%
*“for some reason they are soft and mushy instead of hard like usual and they have a medicine taste to them makes me wonder if some of them broke open and got wet and that's why they're so soft and taste the way they do”*
**Quality-Overall**3%
*“Very inconsistent, not sure about the quality control”*
**Size-Overall**3%
*“Cap is loose fitting”*
**Strength**3%
*“Ineffective, just waste of money”*
**Smell**2%
*“The pills have a chemical smell and chemical taste”*
**Advertised Vs Actual Product**2%
*“Just be aware of these are capsules, not tablets”*
## **Common questions**
- **Is diphenhydramine 50mg 1000 capsules profitable to sell on Amazon United States?**
- The niche generates $9K/yr across 9 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is -7.7%. Flapen's verdict: Skip it (41/100).
- **How competitive is the diphenhydramine 50mg 1000 capsules niche?**
- 9 brands and 14 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 79% of demand.
- **What do buyers complain about in diphenhydramine 50mg 1000 capsules?**
- Top complaints mined from reviews: Sleep Quality, Functionality-Overall, Dosage. The return rate is 0.0%.
- **When does demand for diphenhydramine 50mg 1000 capsules peak?**
- Demand peaks in May; the busiest month runs 3.2× the quietest.
- **What does it cost to enter the diphenhydramine 50mg 1000 capsules niche?**
- Listings span $10.07–$29.46; the average listing price is $17.47 (sweet spot $15–$100). The average incumbent carries 5,616 reviews — the moat a new listing must climb.
## **Related niches in Health & Household**
- 76 [**cedar oil**](https://flapen.com/research/us/health-household/cedar-oil)$1.2M/yr+214.4%**Launch it**- 77 [**nutrapure glp1 cutting mix**](https://flapen.com/research/us/health-household/nutrapure-glp1-cutting-mix)$149K/yr+940.2%**Worth a look**- 77 [**dexcom g7**](https://flapen.com/research/us/health-household/dexcom-g7)$2.0M/yr+39.9%**Launch it**- 77 [**purelia**](https://flapen.com/research/us/health-household/purelia)$635K/yr+359.7%**Worth a look**- 77 [**graduation napkins**](https://flapen.com/research/us/health-household/graduation-napkins)$302K/yr+385.7%**Worth a look**- 77 [**credit card wand**](https://flapen.com/research/us/health-household/credit-card-wand)$418K/yr+101.3%**Worth a look**[**All Health & Household niches **](https://flapen.com/research/us/health-household)