
Isntree
A soothing ampoule featuring red onion extract, panthenol (B5), niacinamide, and tranexamic acid to calm irritation, brighten dark spots, and strengthen the skin barrier. Ideal for sensitive or blemish-prone skin seeking gentle yet effective treatment.
Humectant and preservative booster. Common in K-beauty as a multifunctional alternative to traditional preservatives.
Humectant and skin protectant
+ 15 more ingredients
Editorial baseline from K-beauty clinical research and community consensus. Real subscriber reports layer on as the community grows.

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The key active ingredients in Onion Newpair B5 Ampoule by Isntree include Niacinamide (Vitamin B3) (brightening, pore-minimizing, barrier-support), Trehalose (Humectant and skin protectant), Betaine (Humectant and skin conditioning agent), Arginine (pH adjuster and skin conditioning amino acid), Onion Bulb Extract (Antioxidant and skin soothing agent). Drawing on K-beauty research and community consensus, key ingredients show 84% effectiveness for irritation in sensitive skin types. Seoul Sister tracks ingredient effectiveness across 5,900+ K-beauty products to provide data-backed recommendations.
Onion Newpair B5 Ampoule is a Korean ampoule by Isntree. Sensitive skin compatibility depends on individual triggers and allergies. Seoul Sister's AI advisor Yuri analyzes all 20 ingredients against your specific skin type, concerns, and known allergens to provide a personalized compatibility score. Common irritant ingredients like fragrance, alcohol denat, and essential oils are flagged automatically.
For oily skin, the key factors in evaluating Onion Newpair B5 Ampoule are comedogenic ingredient ratings, oil content, and finish type. This ampoule contains 10 active ingredients. Seoul Sister's database cross-references each ingredient's comedogenic rating (0-5 scale) against your skin type to identify potential pore-clogging risks. Subscribe for a personalized oily skin compatibility analysis.
Onion Newpair B5 Ampoule by Isntree starts from $18.30 USD for [Original Product] 50ml [Special Gift] Cream 20ml. Seoul Sister tracks pricing at Olive Young, with price drop alerts for Pro members. Seoul Sister does not sell products — we compare retailer pricing so you can buy from the source.
Onion Newpair B5 Ampoule by Isntree is tracked at Olive Young. Prices start from $18.30 USD. Seoul Sister verifies retailer authenticity and tracks counterfeit indicators to help you buy genuine Korean skincare products. We are an advice platform and never sell products ourselves.