
Isoi
A lightweight serum formulated with willow bark extract, centella asiatica, and tea tree oil to control acne breakouts and soothe irritated skin. Suitable for acne-prone and sensitive skin types.
Humectant that attracts and retains moisture
Solvent, preservative, and penetration enhancer
Emollient and lightweight skin conditioner
Humectant and skin conditioning agent
+ 15 more ingredients

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The key active ingredients in ACNI Dr. 1st Control Serum by Isoi include Glycerin (Humectant that attracts and retains moisture), Betaine (Humectant and skin conditioning agent), Macadamia Seed Oil (Emollient oil that moisturizes and softens skin), Willow Bark Extract (Natural source of salicin with gentle exfoliating properties), Sophora Root Extract (Anti-inflammatory and skin-soothing botanical extract). Seoul Sister tracks ingredient effectiveness across 5,900+ K-beauty products to provide data-backed recommendations.
ACNI Dr. 1st Control Serum is a Korean serum by Isoi. 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 ACNI Dr. 1st Control Serum are comedogenic ingredient ratings, oil content, and finish type. This serum contains 12 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.
ACNI Dr. 1st Control Serum by Isoi is sold through authorized retailers and the brand itself. Buy from an authorized retailer or the brand's own site rather than an open marketplace. Olive Young Global ships to most countries but no longer ships to the US. Seoul Sister tracks counterfeit indicators to help you buy genuine Korean skincare. We are an advice platform and never sell products ourselves.
That $11 Korean cleanser outperforming your $38 one is not hiding anything. The low price comes from how the Korean beauty industry is built, not from what is in the bottle. With one geographic catch.
Sulwhasoo First Care Serum is a $90+ luxury product, which makes it one of the most counterfeited items in K-beauty. Here are five verifiable checks (from packaging weight to barcode origin) to confirm your bottle is real before it touches your face.