Is time release vitamin c profitable to sell on Amazon United States?

The niche generates $371K/yr across 16 tracked products. 90-day search growth is -6.0%. Flapen's verdict: Skip it (46/100).

How competitive is the time release vitamin c niche?

7 brands and 614 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 96% of demand.

What do buyers complain about in time release vitamin c?

Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Vitamin. The return rate is 0.0%.

When does demand for time release vitamin c peak?

Demand peaks in Mar; the busiest month runs 1.8× the quietest.

What does it cost to enter the time release vitamin c niche?

Listings span $6.72–$33.14; the average listing price is $20.43 (sweet spot $15–$100). The average incumbent carries 7,535 reviews — the moat a new listing must climb.

time release vitamin c

Skip it

Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.

Returns

Incredible0.0%

return rate — above 5% kills the launch gate

Conversion

Incredible12.8%

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

Avg price

Great$20.43

avg listing price — sweet spot $15–$100

Price range

Good$6.72–$33.14

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

Market size

Good$371K

$371K/yr · 141K searches

Competition

Bad70%

top-5 click share — a locked-up shelf

Review moat

Bad7,534.56

avg incumbent reviews — the moat a new listing must climb

Growth

Bad-6.0%

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

Quality gap

Bad4.8★

avg incumbent rating — lower means beatable quality

Brand share

Bad96%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, time release vitamin c is a $371K/yr Amazon United States market (141K searches/yr). The top 5 brands hold 96% of demand. Demand peaks in Mar. Verdict: Skip it — 46/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

time release vitamin c market data

Units sold / yr: 15K–20K; avg 1,000–1,250/product
Revenue / yr: $306K–$409K; units × avg price
Conversion rate: 12.8%
Avg BSR: #297
Page quality: 0%
Prime: 100%
Sponsored: 63%
Out of stock: 0.0%
Avg brand age: 114 months
Avg seller age: 141 days

Competition & brand share

The top 5 products capture 70% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 falling

Sellers

614

Top-5 brand share

96%

Top 20: 100%

Top-5 click share

70%

Top 20: 100%

Open market

SOLARAY72%
NOW Foods8%
Purely Holistic6%
Carlyle6%
Nature Made3%
Life Extension2%
Open — no brand owns it (1 brand, 2%)

Demand & seasonality

Weekly Amazon search volume, last 101 weeks — -6.0% search growth over the last 90 days.

Peak months: Mar · busiest ÷ quietest = 1.8×

Open Trend

Top time release vitamin c search terms

solaray vitamin c40K/yr -9.6%15.1% conv.
time release vitamin c29K/yr +2.0%5.7% conv.
vitamin c time release18K/yr -4.2%4.4% conv.
solaray vitamin c 1000mg7K/yr +22.4%21.8% conv.
time released vitamin c7K/yr -27.9%8.9% conv.
vitamin c time release 1000mg capsules6K/yr -9.6%10.9% conv.
vitamin c solaray5K/yr +0.5%16.9% conv.
slow release vitamin c4K/yr -14.0%7.8% conv.
timed release vitamin c5K/yr -19.0%8.7% conv.
vitamin c time release 500mg6K/yr -11.1%5.6% conv.

All search terms

Top time release 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 16 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

SOLARAY Vitamin C 1000mg - Time Release Vitamin C Capsules w/Rose Hips and Acerola for Bioflavonoid Support - Two-Stage All-Day Immune Support - Vegan 60 Day Guarantee 275 Servings 275 VegCaps

SOLARAY$33.144.8★11,615 rev

SOLARAY Vitamin C 1000mg - Time Release Vitamin C Capsules w/Rose HIPS and Acerola for Bioflavonoid Support - Two-Stage All-Day Immune Support - Vegan 60 Day Guarantee

SOLARAY$15.444.8★11,615 rev

NOW Foods Supplements Vitamin C-1 000 with Rose Hips Sustained Release Antioxidant Protection* 250 Tablets

NOW Foods$16.704.8★20,217 rev

Purely Holistic$26.864.7★2,172 rev

Carlyle Vitamin C 1000mg | Timed Release | 120 Vegetarian Caplets

Carlyle$9.974.8★1,108 rev

Newest

by launch date

SOLARAY Super Bio Vitamin C 1000mg Buffered Time Release Capsules with Bioflavonoids Two-Stage for High Absorption and All Day Immune Support Vegan 60 Day Guarantee 140 Servings 280 VegCaps

SOLARAY$26.042,701 rev

3y ago

Life Extension Vitamin C 24-Hour Liposomal Hydrogel Formula absorbs Better Than Standard Vitamin C up to 24 Hours get The Most Out of Your Vitamin C Gluten-Free Non-GMO Vegetarian 60 Tablets

Life Extension$21.23520 rev

4y ago

Carlyle Vitamin C 1000mg | Timed Release | 120 Vegetarian Caplets

Carlyle$9.971,108 rev

5y ago

Purely Holistic$26.862,172 rev

6y ago

SOLARAY Vitamin C 1000mg - Time Release Vitamin C Capsules w/Rose Hips and Acerola for Bioflavonoid Support - Two-Stage All-Day Immune Support - Vegan 60 Day Guarantee 275 Servings 275 VegCaps

SOLARAY$33.1411,615 rev

7y ago

What buyers say about time release vitamin c

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

What buyers love

Vitamin26%

“Vitamin C was perfect”

Quality-Overall21%

“Overall solid quality from NOW like usual”

Ease Of Chewing/Swallowing10%

“Easy to swallow”

Value For Money4%

“competitive price”

Advertised Vs Actual Product4%

“it is what I wanted”

Acid Regulator/Stomach Ache Relief4%

“no stomach issues”

Dosage4%

“right dose, good value, from a good company”

Cold Relief3%

“Helps to Battle Colds and Viruses”

Immunity Booster3%

“helps with immunity”

Ease Of Use2%

“Ease of use”

What buyers complain about

Size-Overall17%

“These capsules are larger”

Ease Of Chewing/Swallowing13%

“COULD NOT SWALLOW”

Vitamin11%

“So I have an expensive bottle of vitamins that I will have to throw away”

Taste-Overall6%

“Taste Aweful”

Acid Regulator/Stomach Ache Relief5%

“These HDGE pills are difficult to swallow, and unfortunately, they upset my stomach”

Visibility5%

“they are less visible after taking this for 2 weeks which i did not expect”

Ingredients-Overall5%

“Lead is poisonous”

Natural Ingredients5%

“Someone who is seeking the natural sources likely doesnt want the ascorbic acid”

Vegan/Organic5%

“Halal product- No Thanks”

Quality-Overall2%

“Very cheap”

Top return reasons

Size-Overall50%

Vitamin50%

Common questions

Is time release vitamin c profitable to sell on Amazon United States?: The niche generates $371K/yr across 16 tracked products. 90-day search growth is -6.0%. Flapen's verdict: Skip it (46/100).
How competitive is the time release vitamin c niche?: 7 brands and 614 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 96% of demand.
What do buyers complain about in time release vitamin c?: Top complaints mined from reviews: Size-Overall, Ease Of Chewing/Swallowing, Vitamin. The return rate is 0.0%.
When does demand for time release vitamin c peak?: Demand peaks in Mar; the busiest month runs 1.8× the quietest.
What does it cost to enter the time release vitamin c niche?: Listings span $6.72–$33.14; the average listing price is $20.43 (sweet spot $15–$100). The average incumbent carries 7,535 reviews — the moat a new listing must climb.