cold sore prevention supplements
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.0%return rate — above 5% kills the launch gate
Conversion
Incredible17.3%search→purchase rate — share of searches ending in a sale
Avg price
Great$16.38avg listing price — sweet spot $15–$100
Price range
Good$7.76–$25.91cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Good$355K$355K/yr · 125K searches
Growth
Bad-6.2%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Review moat
Bad9,898.7avg incumbent reviews — the moat a new listing must climb
Competition
Bad84%top-5 click share — a locked-up shelf
Brand share
Bad100%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, cold sore prevention supplements is a $355K/yr Amazon United States market (125K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 43/100.
Data updated Jul 25, 2026 · scored weekly · How we score niches
cold sore prevention supplements market data
- Units sold / yr
- 20K–25K
- avg 2,500–3,000/product
- Revenue / yr
- $328K–$410K
- units × avg price
- Conversion rate
- 17.3%
- Avg BSR
- #207
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 80%
- Out of stock
- 0.0%
- Avg brand age
- 87 months
- Avg seller age
- 148 days
Competition & brand share
The top 5 products capture 84% of clicks — a locked-up shelf that new listings rarely crack.Brands
2 flat
Sellers
596
Top-5 brand share
100%
Top 20: 100%
Top-5 click share
84%
Top 20: 100%
Open market
0%
- Quantum76%
- NOW Foods24%
Demand
Weekly Amazon search volume, last 47 weeks — -6.2% search growth over the last 90 days.Top cold sore prevention supplements search terms
- super lysine39K/yr
- super lysine immune support18K/yr
- quantum health super lysine11K/yr
- now lysine8K/yr
- super lysine plus6K/yr
- superlysine5K/yr
- cold sore pills4K/yr
- superlysine+4K/yr
- now lysine 1000mg capsules3K/yr
- now l-lysine3K/yr
Top cold sore prevention supplements 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.
All 10 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Quantum Health SuperLysine+ 1500mg L-lysine Immune Support 180 Tablets
Quantum$19.474.6★14,189 rev
Quantum Health SuperLysine+ 1500mg L-lysine Immune Support 90 Tablets
Quantum$11.964.7★2,612 rev
NOW Foods Supplements (L-Lysine Hydrochloride) 1 000 mg Double Strength Amino Acid 100 Tablets
NOW Foods$8.444.6★38,103 rev
Quantum SuperLysine+ Cold Sore Treatment Ointment|Relieves Pain Burning and Itching|Cuts Healing Time in Half|0.25 Ounce
Quantum$8.704.6★2,324 rev
Now Foods L-Lysine 1000mg - Double Strength - 300 Tablets - Non-GMO Amino Acid Supplement (Llysine Hydrochloride)- 1000 mg Tabs - Vegan/Vegetarian
NOW Foods$25.914.8★574 rev
Newest
by launch date
Now L-Lysine 500 mg 360 Vegetarian Capsules
NOW Foods$23.97250 rev
Now Foods L-Lysine 1000mg - Double Strength - 300 Tablets - Non-GMO Amino Acid Supplement (Llysine Hydrochloride)- 1000 mg Tabs - Vegan/Vegetarian
NOW Foods$25.91574 rev
NOW Foods Supplements L-Lysine (L-Lysine Hydrochloride) 1 000 mg Double Strength Amino Acid 250 Tablets
NOW Foods$18.4338,103 rev
Quantum Health SuperLysine+ Lip Sunscreen SPF 21 Clear Balm 0.17 oz
Quantum$7.761,532 rev
Quantum Health SuperLysine+ 1500mg L-lysine Immune Support 90 Tablets
Quantum$11.962,612 rev
Trending
90-day click momentumNow Foods L-Lysine 1000mg - Double Strength - 300 Tablets - Non-GMO Amino Acid Supplement (Llysine Hydrochloride)- 1000 mg Tabs - Vegan/Vegetarian
NOW Foods$25.914.8★
Quantum Super Lysine 180 Count
Quantum$21.254.8★
NOW Foods Supplements L-Lysine (L-Lysine Hydrochloride) 1 000 mg Double Strength Amino Acid 250 Tablets
NOW Foods$18.434.6★
Quantum Health SuperLysine+ 1500mg L-lysine Immune Support 90 Tablets
Quantum$11.964.7★
Quantum SuperLysine+ Cold Sore Treatment Ointment|Relieves Pain Burning and Itching|Cuts Healing Time in Half|0.25 Ounce
Quantum$8.704.6★
What buyers say about cold sore prevention supplements
What buyers praise and complain about, mined from review topics.What buyers love
“Helps me keep from getting cold sores”
“consistent in quality”
“Great vitamin supplement”
“Affordable”
“supportive supplement for immune health”
“Effective”
“GREAT FOR Eczema”
“Great value if it works as advertised”
“Ive never had a problem with swallowing pills”
“And so, if you're getting these to be easier to swallow than the larger dose, the only easier is that they are in gelcap form”
What buyers complain about
“The container is also very small”
“Hard to Swallow”
“They don't do well in the bottle”
“The picture provided was misleading”
“Cost too much for the effectiveness”
“after that I started to feel light headed”
“It didnt help”
“have a garlic smell”
“This item has NO lysine in it”
“they are so hard that I couldn't even break them into two”
Top return reasons
Common questions
- Is cold sore prevention supplements profitable to sell on Amazon United States?
- The niche generates $355K/yr across 10 tracked products. 90-day search growth is -6.2%. Flapen's verdict: Skip it (43/100).
- How competitive is the cold sore prevention supplements niche?
- 2 brands and 596 sellers compete. The top 5 products take 84% of clicks and top 5 brands hold 100% of demand.
- What do buyers complain about in cold sore prevention supplements?
- Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Dosage. The return rate is 0.0%.
- What does it cost to enter the cold sore prevention supplements niche?
- Listings span $7.76–$25.91; the average listing price is $16.38 (sweet spot $15–$100). The average incumbent carries 9,899 reviews — the moat a new listing must climb.