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C Niacin Toning Ampoule
Serum · 50 ml · $0.27/ml
Isntree C Niacin Toning Ampoule is a serum that combines niacinamide and vitamin C derivative to brighten the look of skin and support an even complexion.
Currently sold at 4 retailers selling to US shoppers, from $13.68 (cheapest: YesStyle) to $18.24. Average US price $16.16. Prices checked October 6, 2026.
Best price right now
$13.68
$0.27 per ml
Checked today
at YesStyle
$4.22 less than the typical seller (24%).
Also available at
Now $13.68 at YesStyle; lowest we've seen: $13.68.
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Prices last checked today · across 4 retailers
Prices can change between checks — confirm the final price on the retailer's site before buying.
Big retailers
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Price history
What this serum has actually cost
We check every authenticated seller daily; each point is the lowest price we found that day.
The best total right now from an authorized, authenticity-checked seller of Isntree C Niacin Toning Ampoule is $13.68 at YesStyle — checked Oct 5, 2026. We rank on price plus shipping, and show what each price does and does not include. We never take payment to rank.
Skin compatibility
Will this suit your skin?
We run the ingredient list we hold against three curated reference lists. Skin is personal — these are notes to help you decide, not rules. Pregnancy questions belong with your doctor, and if we don't have a full ingredient list we say so instead of guessing.
Transparency
What's actually in it
Key active
Hippophae Rhamnoides Fruit Extract
69%
Antioxidant sea buckthorn extract, brightening and soothing
Key active
Niacinamide
listed
Brightening, barrier support, evens tone
Key active
3-O-Ethyl Ascorbic Acid
listed
Stable vitamin C derivative for brightening
Concentrations as stated by the brand — we never estimate them from the INCI order.
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Answers