Is lysine 500mg capsules profitable to sell on Amazon United States?

The niche generates $433K/yr across 15 tracked products. 90-day search growth is +7.6%. Flapen's verdict: Worth a look (51/100).

How competitive is the lysine 500mg capsules niche?

11 brands and 574 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 86% of demand.

What do buyers complain about in lysine 500mg capsules?

Top complaints mined from reviews: Size-Overall, Value For Money, Side Effects. The return rate is 0.0%.

When does demand for lysine 500mg capsules peak?

Demand peaks in Jan–Dec; the busiest month runs 1.9× the quietest.

What does it cost to enter the lysine 500mg capsules niche?

Listings span $5.75–$39.41; the average listing price is $15.62 (sweet spot $15–$100). The average incumbent carries 3,340 reviews — the moat a new listing must climb.

Lysine 500mg Capsules

Worth a look

Shows low returns (0.0%), but strong incumbent ratings (4.7★) keeps it on the watch list.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible18.3%

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

Avg price

Great$15.62

avg listing price — sweet spot $15–$100

Price range

Good$5.75–$39.41

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

Market size

Good$433K

$433K/yr · 152K searches

Growth

Okay+7.6%

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

Review moat

Okay3,339.8

avg incumbent reviews — the moat a new listing must climb

Brand share

Okay86%

top-5 brand share — brands hold most of the demand

Competition

Bad71%

top-5 click share — a locked-up shelf

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Is lysine 500mg capsules profitable on Amazon?

According to Flapen's Amazon United States niche tracking, lysine 500mg capsules is a $433K/yr Amazon United States market (152K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Jan–Dec. Verdict: Worth a look — 51/100.

Data updated Jul 25, 2026 · scored weekly · How we score niches

lysine 500mg capsules market size & sales

Units sold, revenue, conversion and listing quality across the tracked shelf.

Units sold / yr: 25K–30K; avg 1,500–2,000/product
Revenue / yr: $391K–$469K; units × avg price
Conversion rate: 18.3%
Avg BSR: #161
Page quality: 0%
Prime: 93%
Sponsored: 53%
Out of stock: 0.0%
Avg brand age: 92 months
Avg seller age: 173 days

Competition: brands, sellers & click share

The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.

Brands

11 rising

Sellers

574

Top-5 brand share

86%

Top 20: 100%

Top-5 click share

71%

Top 20: 100%

Open market

11%

NOW Foods41%
Pure Encapsulations33%
Swanson6%
Best Naturals3%
Nature Made3%
THORNE3%
Open — no brand owns it (5 brands, 11%)

lysine 500mg capsules demand & seasonality

Weekly Amazon search volume, last 102 weeks — +7.6% search growth over the last 90 days.

Peak months: Jan, Dec · busiest ÷ quietest = 1.9×

Open Trend

Top lysine 500mg capsules search terms shoppers use

The exact queries shoppers type, with yearly volume, growth and conversion.

lysine 500mg42K/yr +9.5%15.0% conv.
l lysine 500 mg capsules41K/yr +4.9%13.0% conv.
l-lysine 500mg capsules31K/yr +7.4%13.8% conv.
l-lysine 500mg7K/yr +4.5%12.6% conv.
pure lysine6K/yr +22.2%19.8% conv.
lysine 500mg capsules6K/yr +2.3%14.2% conv.
pure encapsulations lysine4K/yr +17.4%27.5% conv.
l lysine 500 mg3K/yr -3.9%13.0% conv.
lysine pure encapsulations2K/yr +31.0%25.2% conv.
lysine 500 mg3K/yr -2.8%12.6% conv.

All search terms

Top lysine 500mg capsules 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.

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

All 15 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Pure Encapsulations L-Lysine - Essential Amino Acid Supplement for Immune Support & Gum Lip Health* - with L-Lysine HCl - 90 Capsules

Pure Encapsulations$14.854.8★5,688 rev

NOW Supplements L-Lysine (L-Lysine Hydrochloride) 500 mg Amino Acid 250 Tablets

NOW Foods$11.754.7★5,272 rev

NOW Foods Supplements L-Lysine (L-Lysine Monohydrochloride) 500 mg Amino Acid 100 Veg Capsules

NOW Foods$7.124.7★2,134 rev

Now L-Lysine 500 mg 360 Vegetarian Capsules

NOW Foods$23.974.7★250 rev

Swanson L-Lysine Amino Acid Supplement for Stress-Prone Adults Seeking Nervous System and Immune Support - 500 mg Free Form (300 Capsules)

Swanson$16.734.8★784 rev

Newest

by launch date

L Lysine 500mg Tablets Super Lysine Immune Support & Healthy Skin 250 Count (Pack of 1) Plus Sticker vsl

Generic$17.782 rev

1y ago

Now L-Lysine 500 mg 360 Vegetarian Capsules

NOW Foods$23.97250 rev

2y ago

365 by Whole Foods Market L-Lysine 500mg 100 Count

365 by Whole Foods Market$9.06313 rev

8y ago

Nutricost L-Lysine 1000mg Per Serving 250 Servings 500 Capsules - Gluten Free Non-GMO 500mg Per Capsule

Nutricost$21.667,057 rev

10y ago

Best Naturals L-Lysine 500 mg 250 Tablets

Best Naturals$9.991,372 rev

11y ago

What reviews say buyers love and hate about lysine 500mg capsules

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

What buyers love

Quality-Overall13%

“consistent in quality”

Value For Money11%

“Good price”

Cold Relief11%

“Helps me keep from getting cold sores”

Efficiency6%

“Works fast and well”

Ease Of Chewing/Swallowing6%

“are not difficult to swallow”

Fever Relief5%

“which is effective for me to prevent fever blisters”

Advertised Vs Actual Product5%

“Works as intended”

Vitamin4%

“Great supplement”

Nutritional Content3%

“Good supplement”

Dosage3%

“My friends say they take them and it works”

What buyers complain about

Size-Overall23%

“Too big”

Value For Money9%

“waste of money”

Side Effects7%

“Side effects”

Functionality-Overall6%

“Dont work”

Ease Of Chewing/Swallowing6%

“Not sure it will get into mouth”

Pain Relief-Overall4%

“so I don't think they are very effective in preventing could sores”

Dosage3%

“It doesn't work like it's even 500mg”

Color Fading/Discoloration2%

“Pills are turning yellow which is concerning”

Nutritional Content2%

“There are no soy or corn ingredients in this supplement”

Stress/Anxiety2%

“I have bad anxiety when I drive places I don't know well”

Top return reasons

Functionality-Overall33%

Vegan/Organic33%

Dosage33%

Common lysine 500mg capsules questions

Is lysine 500mg capsules profitable to sell on Amazon United States?: The niche generates $433K/yr across 15 tracked products. 90-day search growth is +7.6%. Flapen's verdict: Worth a look (51/100).
How competitive is the lysine 500mg capsules niche?: 11 brands and 574 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 86% of demand.
What do buyers complain about in lysine 500mg capsules?: Top complaints mined from reviews: Size-Overall, Value For Money, Side Effects. The return rate is 0.0%.
When does demand for lysine 500mg capsules peak?: Demand peaks in Jan–Dec; the busiest month runs 1.9× the quietest.
What does it cost to enter the lysine 500mg capsules niche?: Listings span $5.75–$39.41; the average listing price is $15.62 (sweet spot $15–$100). The average incumbent carries 3,340 reviews — the moat a new listing must climb.