Is high dose vitamin c profitable to sell on Amazon United States?

The niche generates $328K/yr across 10 tracked products. 90-day search growth is -9.7%. Flapen's verdict: Skip it (44/100).

How competitive is the high dose vitamin c niche?

6 brands and 14 sellers compete. The top 5 products take 88% of clicks and top 5 brands hold 98% of demand.

What do buyers complain about in high dose vitamin c?

Top complaints mined from reviews: Dosage, Taste-Overall, Vitamin. The return rate is 0.0%.

When does demand for high dose vitamin c peak?

Demand peaks in Feb; the busiest month runs 3.1× the quietest.

What does it cost to enter the high dose vitamin c niche?

Listings span $9.66–$46.83; the average listing price is $24.99 (sweet spot $15–$100). The average incumbent carries 6,572 reviews — the moat a new listing must climb.

high dose vitamin c

Skip it

Brand-locked demand (top 5 brands take 98% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible12.9%

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

Avg price

Incredible$24.99

avg listing price — sweet spot $15–$100

Price range

Great$9.66–$46.83

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

Market size

Good$328K

$328K/yr · 101K searches

Review moat

Bad6,571.5

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-9.7%

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

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Competition

Bad88%

top-5 click share — a locked-up shelf

Brand share

Bad98%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, high dose vitamin c is a $328K/yr Amazon United States market (101K searches/yr). The top 5 brands hold 98% of demand. Demand peaks in Feb. Verdict: Skip it — 44/100.

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

high dose vitamin c market data

Units sold / yr: 13K–15K; avg 1,250–1,500/product
Revenue / yr: $312K–$375K; units × avg price
Conversion rate: 12.9%
Avg BSR: #66
Page quality: 0%
Prime: 100%
Sponsored: 100%
Out of stock: 0.0%
Avg brand age: 97 months
Avg seller age: 154 days

Competition & brand share

The top 5 products capture 88% of clicks — a locked-up shelf that new listings rarely crack.

Brands

6 falling

Sellers

Top-5 brand share

98%

Top 20: 100%

Top-5 click share

88%

Top 20: 100%

Open market

Sports Research52%
Sufficient-C33%
Carlyle7%
NutriFlair4%
Vitablosom2%
Micro Ingredients2%

Demand & seasonality

Weekly Amazon search volume, last 100 weeks — -9.7% search growth over the last 90 days.

Peak months: Feb · busiest ÷ quietest = 3.1×

Open Trend

Top high dose vitamin c search terms

sports research vitamin c22K/yr +5.2%14.6% conv.
high dose vitamin c23K/yr -7.5%4.4% conv.
high potency vitamin c13K/yr +0.0%1.9% conv.
sufficient c vitamin c powder17K/yr -10.9%18.6% conv.
sufficient c11K/yr -38.8%17.4% conv.
vitamin c sports research6K/yr -8.3%13.6% conv.
vitamin c high dose6K/yr -24.2%4.5% conv.
vitamin c high potency3K/yr -8.5%4.0% conv.

All search terms

Top high dose vitamin c 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.

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

Sports Research High Potency Vitamin C Supplement - Vegan Veggie Capsules for Antioxidant Activity & Immune Support - Non-GMO Verified & Gluten Free - Ascorbic Acid Vitamin C 1000mg 240 Count

Sports Research$20.954.8★10,520 rev

Sports Research High Potency Liposomal Vitamin C Supplement 1000 mg Certified Vegan Non-GMO Gluten Free | Antioxidant & Immune Support | Ascorbic Acid Vitamin C | 180 Liquid Veggie Capsules

Sports Research$34.594.8★10,520 rev

Sufficient-C 4 000 mg. High-Dose Vitamin C Lemon Peach Immune-Ade Drink Mix - 250 gram - Refreshing with Generously Dosed L-lysine Bromelain & 96% Pure Caffeine-Free Green Tea Extract

Sufficient-C$46.834.7★1,868 rev

Sufficient-C High Dose Non-GMO Vitamin C Lemon Peach Immune-Ade Drink Mix Convenient 125 Gram Size w/L-lysine Bromelain & a Premium 96% Pure Green Tea Extract - Stomach Friendly Adrenal Supportive

Sufficient-C$28.074.7★1,410 rev

Carlyle Liposomal Vitamin C | 2200mg | 90 Softgel Capsules

Carlyle$9.664.7★1,299 rev

Newest

by launch date

Sports Research High Potency Liposomal Vitamin C Supplement 1000 mg Certified Vegan Non-GMO Gluten Free | Antioxidant & Immune Support | Ascorbic Acid Vitamin C | 180 Liquid Veggie Capsules

Sports Research$34.5910,520 rev

1y ago

Liposomal Vitamin C 2 500mg 240 Veggie Capsules | Highly Bioavailable Fat Soluble Form | Immune Support & Antioxidant Supplement | Liposomal Delivery for Superior Absorption | Non-GMO Gluten Free

Micro Ingredients$21.86539 rev

1y ago

Carlyle Liposomal Vitamin C | 2200mg | 90 Softgel Capsules

Carlyle$9.661,299 rev

3y ago

Vitablosom Liposomal Vitamin C 2000mg Liquid for Adults High Absorption VIT C Maximize Vitamin C Immune System & Antioxidant Support 60ML (2 Bottle)

Vitablosom$34.662,616 rev

4y ago

Carlyle Vitamin C 2000mg | with Rose Hips | 150 Caplets

Carlyle$11.873,360 rev

4y ago

What buyers say about high dose vitamin c

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

What buyers love

Vitamin23%

“Health vitamin”

Quality-Overall23%

“The quality feels solid”

Value For Money5%

“Worth it”

Acid Regulator/Stomach Ache Relief5%

“gentle on my stomach”

Immunity Booster4%

“I love this for immune support”

Ease Of Use3%

“Easy to use”

Taste-Overall3%

“Another plus is the taste,its pleasant and easy to take, which makes it simple to use consistently”

Absorbency3%

“Great absorption”

Advertised Vs Actual Product2%

“Does what it's supposed to do”

Cold Relief2%

“no colds so far”

What buyers complain about

Dosage12%

“When you need a high dose it means having to take way too many capsules which makes them expensive”

Taste-Overall8%

“just ok. do not care for the taste”

Vitamin7%

“taking too much vitamin C can give some people Acid Reflux”

Size-Overall7%

“Capsules are DIFFERENT SIZES”

Value For Money5%

“It is expensive”

Solubility3%

“It can be a little graining because it doesnt dissolve well”

Stale/Rotten/Spoiled3%

“However, on occasion, the entire bottle has arrived filled with old, yellowed Vitamin C capsules”

Color3%

“At first, I was a little wary of the color since theyre not pure white”

Advertised Vs Actual Product3%

“Misleading”

Quality-Overall3%

“Theyre cheap because the company is cheap and not reputable”

Top return reasons

Ease Of Chewing/Swallowing11%

Joint Pain11%

Color Fading/Discoloration11%

Dosage11%

Certifications11%

Quality-Overall11%

Product Condition11%

Acid Regulator/Stomach Ache Relief11%

Taste-Overall11%

Common questions

Is high dose vitamin c profitable to sell on Amazon United States?: The niche generates $328K/yr across 10 tracked products. 90-day search growth is -9.7%. Flapen's verdict: Skip it (44/100).
How competitive is the high dose vitamin c niche?: 6 brands and 14 sellers compete. The top 5 products take 88% of clicks and top 5 brands hold 98% of demand.
What do buyers complain about in high dose vitamin c?: Top complaints mined from reviews: Dosage, Taste-Overall, Vitamin. The return rate is 0.0%.
When does demand for high dose vitamin c peak?: Demand peaks in Feb; the busiest month runs 3.1× the quietest.
What does it cost to enter the high dose vitamin c niche?: Listings span $9.66–$46.83; the average listing price is $24.99 (sweet spot $15–$100). The average incumbent carries 6,572 reviews — the moat a new listing must climb.