Step 01 · Cleanse

Cleansing Serum — Niacinamide

Name: Cleansing Serum — Niacinamide
Brand: Youlief
SKU: YLF-CS-NIA
Price: 22 USD
Availability: InStock

100 mL / 3.38 fl. oz.

$22

A serum-soft cleanse without the tight finish.

A silky, low-foam cleanser with sugar-derived and amino-acid-based cleansing agents, glycerin, hyaluronic acid and niacinamide. It lifts daily buildup and rinses clean while skin feels soft and comfortable.

Soft, low-foam daily cleanseComfortable, non-squeaky after-feelSerum-like slip

In stock — ships across the United States now

Secure checkout on Shopify, powered by Vegalab — Youlief’s distributor in the United States.

What it does

Soft, low-foam daily cleanse

Comfortable, non-squeaky after-feel

Serum-like slip

Suitable for morning and evening routines

How it works

Inside the formula

Sugar- & amino-acid-derived cleansers

Low-foam cleansing agents chosen for a serum-like slip that rinses clean without a tight finish.

Niacinamide

A well-known brightening favourite, here in a rinse-off step.

Glycerin & hyaluronic acid

Leave skin feeling soft and comfortable rather than squeaky.

Testing

Tested

A primary skin-irritation test was completed on sensitive-skin subjects at an independent testing centre.

Test facility: Corederm Co., Ltd. Non-clinical Testing Center
Test number: CDS-2500-012-3(1)
Test period: October – November 2025
Subjects: 32 adults aged 20–55

Watch

See it in use

The one-step cleansing serum, in use.

Loved in Korea

Loved in Korea — from our creator campaigns

Videos produced with creators as part of paid campaigns in Korea. Individual experiences; not a promise of typical results.

Customer gallery

Photos from customers in Korea

Customer photo of Cleansing Serum — Niacinamide submitted by a Youlief customer in Korea — Cleans well and leaves skin feeling fresh and soft. Lovely.
네**** · 2025-11-15 · source

Originally posted by a Youlief customer in Korea. Translated from Korean; minor edits may be made for clarity without changing meaning. Photos are unedited customer submissions shown as posted, not clinical before/after evidence. 1 shown here, selected from 45 reviews for this product on the Korean site — view the source.

How to use

Using Cleansing Serum — Niacinamide

Massage over damp face with wet hands, then rinse thoroughly. Use morning and evening. For heavy or waterproof makeup, use a dedicated first-step remover before cleansing.

Full ingredient list (INCI)

Water, Glycerin, Coco-Glucoside, Lauryl Glucoside, Lauryl Hydroxysultaine, Sodium Cocoyl Alaninate, Butylene Glycol, Disodium Cocoamphodiacetate, 2,3-Butanediol, Coco-Betaine, Sodium Chloride, Isopentyldiol, Glycolipids, Betaine, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Glyceryl Oleate, Hydroxyacetophenone, Sorbitol, Propanediol, Niacinamide, Hexylene Glycol, Caprylyl Glycol, Citric Acid, Disodium EDTA, 1,2-Hexanediol, Ethylhexylglycerin, Sodium Hyaluronate, Mannitol, Tocopherol, Hydrogenated Palm Glycerides Citrate, Glycyrrhetinic Acid, Fragrance, Limonene, Linalool

Specifications

Size: 100 mL / 3.38 fl. oz.
SKU: YLF-CS-NIA
Made in South Korea.
Distributed in the United States by Vegalab LLC.

Caution

For external use only. Avoid direct contact with the eyes; rinse with water if contact occurs. Discontinue use if redness, itching or discomfort develops and consult a physician if it persists. Do not apply to broken or irritated skin. Store away from direct sunlight and keep out of reach of children.

Shipping & returns

Ships across the United States via USPS — $10 flat, free on orders of $100 or more. Unopened, unused products may be returned within 14 days of delivery for a refund of the product price — email us for a return authorization first. Opened or used products cannot be returned for hygiene reasons. See our Shipping & Returns page for full details.