Is nag profitable to sell on Amazon United States?

The niche generates $45K/yr across 10 tracked products. 90-day search growth is +44.6%. Flapen's verdict: Skip it (48/100).

How competitive is the nag niche?

7 brands and 12 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 90% of demand.

What do buyers complain about in nag?

Top complaints mined from reviews: Acid Regulator/Stomach Ache Relief. The return rate is 0.0%.

When does demand for nag peak?

Demand peaks in May; the busiest month runs 1.4× the quietest.

What does it cost to enter the nag niche?

Listings span $5.37–$42.19; the average listing price is $18.80 (sweet spot $15–$100). The average incumbent carries 280 reviews — the moat a new listing must climb.

Nag

Skip it

A small market ($45K/yr) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Review moat

Great280.2

avg incumbent reviews — the moat a new listing must climb

Avg price

Great$18.80

avg listing price — sweet spot $15–$100

Price range

Good$5.37–$42.19

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

Growth

Good+44.6%

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

Conversion

Good4.1%

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

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay90%

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

Competition

Bad79%

top-5 click share — a locked-up shelf

Market size

Bad$45K

$45K/yr · 59K searches

Is nag profitable on Amazon?

According to Flapen's Amazon United States niche tracking, nag is a $45K/yr Amazon United States market (59K searches/yr). The top 5 brands hold 90% of demand. Demand peaks in May. Verdict: Skip it — 48/100.

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

nag market size & sales

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

Units sold / yr: 3K–4K; avg 250–500/product
Revenue / yr: $56K–$75K; units × avg price
Conversion rate: 4.1%
Avg BSR: #2,049
Page quality: 0%
Prime: 100%
Sponsored: 70%
Out of stock: 4.5%
Avg brand age: 78 months
Avg seller age: 167 days

Competition: brands, sellers & click share

The top 5 products capture 79% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

Top-5 brand share

90%

Top 20: 100%

Top-5 click share

79%

Top 20: 100%

Open market

BulkSupplements30%
Jarrow Formulas28%
Horbäach13%
BESTVITE11%
Source Naturals8%
Allergy Research Group7%
Open — no brand owns it (1 brand, 4%)

nag demand & seasonality

Weekly Amazon search volume, last 103 weeks — +44.6% search growth over the last 90 days.

Peak months: May · busiest ÷ quietest = 1.4×

Open Trend

Top nag search terms shoppers use

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

nag36K/yr +31.4%2.8% conv.
n acetyl glucosamine8K/yr +57.1%6.3% conv.
n acetyl d glucosamine3K/yr >1,000%4.4% conv.
nag supplement7K/yr +11.4%8.7% conv.
n-acetyl glucosamine5K/yr -2.7%6.3% conv.

All search terms

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

Top sellers

by 90-day click share

Jarrow Formulas N-A-G 700 mg N-Acetyl Glucosamine Acetylated Form of Glucosamine for Bone and Joint Support 120 Veggie Capsules Up to 120 Servings

Jarrow Formulas$19.804.5★1,034 rev

BulkSupplements.com N-Acetyl Glucosamine Capsules - NAG Supplement N-Acetyl D-Glucosamine - Glucosamine Supplement 2 Capsules per Serving 240 Count (Pack of 1)

BulkSupplements$19.044.4★59 rev

Horbaach N-Acetyl Glucosamine 1000 mg | 120 Capsules

Horbäach$13.034.5★111 rev

BESTVITE N-Acetyl Glucosamine (N-A-G) 700mg (120 Capsules) - No Stearates - Non GMO - Gluten Free

BESTVITE$16.934.6★214 rev

BulkSupplements.com N-Acetyl Glucosamine Powder - NAG Powder Glucosamine 750mg Nutritional Supplement - Gluten Free 750mg of per Serving 250g (8.8 oz) (Pack of 1)

BulkSupplements$20.164.5★449 rev

Newest

by launch date

BulkSupplements.com N-Acetyl Glucosamine Capsules - NAG Supplement N-Acetyl D-Glucosamine - Glucosamine Supplement 2 Capsules per Serving 240 Count (Pack of 1)

BulkSupplements$19.0459 rev

1y ago

Horbaach N-Acetyl Glucosamine 1000 mg | 120 Capsules

Horbäach$13.03111 rev

2y ago

BESTVITE N-Acetyl Glucosamine (N-A-G) 700mg (120 Capsules) - No Stearates - Non GMO - Gluten Free

BESTVITE$16.93214 rev

6y ago

BulkSupplements.com N-Acetyl Glucosamine Powder - NAG Powder Glucosamine 750mg Nutritional Supplement - Gluten Free 750mg of per Serving 250g (8.8 oz) (Pack of 1)

BulkSupplements$20.16449 rev

8y ago

BulkSupplements.com N-Acetyl Glucosamine Powder - NAG Powder Glucosamine 750mg Nutritional Supplement - Gluten Free 750mg of per Serving 100g (3.5 oz) (Pack of 1)

BulkSupplements$15.49449 rev

8y ago

What reviews say buyers love and hate about nag

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

What buyers love

Joint Pain17%

“Great supplement for back pain”

Vitamin12%

“This is an effective supplement for a good price”

Inflammation10%

“Great for psoriasis”

Quality-Overall10%

“Good quality”

Value For Money8%

“This is an effective supplement for a good price”

Efficiency7%

“It definitely works”

Skin Health7%

“Repairing damaged skin”

Regulates Digestion7%

“Helps digestion”

Strength7%

“Effective”

Advertised Vs Actual Product4%

“Better than expected”

What buyers complain about

Acid Regulator/Stomach Ache Relief100%

“It made my stomach worse”

Top return reasons

Advertised Vs Actual Product100%

Common nag questions

Is nag profitable to sell on Amazon United States?: The niche generates $45K/yr across 10 tracked products. 90-day search growth is +44.6%. Flapen's verdict: Skip it (48/100).
How competitive is the nag niche?: 7 brands and 12 sellers compete. The top 5 products take 79% of clicks and top 5 brands hold 90% of demand.
What do buyers complain about in nag?: Top complaints mined from reviews: Acid Regulator/Stomach Ache Relief. The return rate is 0.0%.
When does demand for nag peak?: Demand peaks in May; the busiest month runs 1.4× the quietest.
What does it cost to enter the nag niche?: Listings span $5.37–$42.19; the average listing price is $18.80 (sweet spot $15–$100). The average incumbent carries 280 reviews — the moat a new listing must climb.

Nag