ISOI
ISOI Brightening Tonic Essence
Ingredient analysis and how the ad lines read
Read on 2026-09-22
What is this product?
A brightening functional toner with arbutin at the fourth position, supported by a long roster of plant extracts, and built on an alcohol-first base that may not suit very dry or sensitive skin.
What makes it different?
This is one of the few toners where the brightening active arbutin sits fourth, right after water, alcohol and glycerin, rather than trailing the list. The formula leans on Rosa Damascena Flower Oil and flower and fruit extracts as its identity, matching the brand's botanical positioning. Concentrations are not printed anywhere on the page, so strength of the actives cannot be judged. The ethanol-first base is flagged as plant-fermented by the brand but is still a drying alcohol in this index.
What is in it?
The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know about that ingredient.
This brand publishes its ingredient list in Korean only. Names below are the matching INCI names from the Korean Cosmetic Association ingredient dictionary, except 5 with no dictionary entry, left in Korean.
Key ingredientWorth a closer look
- Water
- Alcohol
- Glycerin
- Arbutin
- Betaine
- Castanea Crenata (Chestnut) Shell Extract
- Salix Alba (Willow) Bark Extract
- Centella Asiatica Extract
- Rosa Damascena Flower Oil
- Panthenol
- 아사이팜열매추출물
- Vaccinium Angustifolium (Blueberry) Fruit Extract
- Phyllanthus Emblica Fruit Extract
- Vaccinium Macrocarpon (Cranberry) Fruit Extract
- Rosa Damascena Flower Water
- Houttuynia Cordata Extract
- 붉나무충영추출물
- Olea Europaea (Olive) Leaf Extract
- 감국꽃추출물
- 회화나무싹추출물
- Prunella Vulgaris Leaf Extract
- Calendula Officinalis Flower Extract
- Butylene Glycol
- 1,2-Hexanediol
- Scutellaria Baicalensis Root Extract
- Paeonia Suffruticosa Root Extract
- Glycyrrhiza Glabra (Licorice) Root Extract
- Citronellol
- 제라니올 *아이소이에서 사용하는 에탄올은 식물발효성분입니다.
Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.
We could not place these in the list above: 다마스크장미꽃오일
Did the ad claims hold up?
We checked 6 lines this product advertises against the ingredient list and public documents. 2 of them hold up. The rest are only partly right or have nothing behind them.
Claims translated from Korean, originals preserved.
backed by evidence2
- This product is a whitening functional cosmetic.
Korean original
해당 제품 미백 기능성 화장품입니다.
- In addition to Isoi's signature ingredient, Damask rose flower oil, it contains acai palm fruit extract, cranberry extract, Damask rose flower water, and Houttuynia cordata extract (fish mint extract), which are effective in hydrating the skin and organizing the skin texture.
Korean original
아이소이의 시그니처 성분인 다마스크장미꽃오일은 물론, 피부에 촉촉하고 결을 정돈해 주는 데 효과적인 아사이팜열매추출물, 크랜베리추출물, 다마스크장미꽃수, 약모밀추출물(어성초추출물) 등이 함유되어 있습니다.
likely, not proven1
- Wrapping the base skin moistly<br> functional blemish care tonic
Korean original
바탕 피부를 촉촉하게 감싸주는<br> 기능성 잡티 케어 토닉
partly backed1
- It is a functional toner that manages dark blemishes and dull skin tone. It contains whitening functional arbutin to care for bright skin, and plant-derived moisturizing ingredients to create moist skin.
Korean original
거뭇한 잡티와 칙칙한 피부톤을 관리해주는 기능성 토너입니다. 미백기능성 알부틴이 함유되어 환한 피부로 케어해 주고, 식물유래 보습 성분들이 촉촉한 피부로 가꾸어 줍니다.
overstated ad line1
- A blemish toner that creates clear skin
Korean original
맑은 피부를 만들어줄 잡티토너
says nothing1
- Immediately after cleansing, the first step of dark blemish care
Korean original
세안 직후, 거뭇한 잡티케어의 첫 단계
Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.