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Hanyul

Hanyul Yuja Vitamin Sleeping Mask

Ingredient analysis and how the ad lines read

Product photo of Hanyul Yuja Vitamin Sleeping Mask

Read on 2026-09-09

What is this product?

A 70 ml overnight jelly cream mask from Hanyul, built on a yuja block with six printed concentrations and a niacinamide plus adenosine functional pair. The reason to pick it: the brand publishes an actual human application study on its own page, naming 피앤케이피부임상연구센타, a 2022.05.02 to 06.10 period and 30 sleep-deprived adults, and reports 피부 표면 멜라닌 -22% at four weeks and moisture +404% immediately falling to +56% at eight hours. That level of disclosure, including the timescales and the drop-off, is unusual. A 주름개선 미백기능성 emblem appears on the brand's own page and is consistent with the adenosine and niacinamide on the label.

What makes it different?

An overnight mask whose brand page publishes a named human application study with its period, institution and panel definition, and prints both the with-cream and the mask-alone figures side by side, set against a fragrance and alcohol load that makes it a poor fit for reactive skin.

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

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: Citrus Junos Peel Oil, Cymbopogon Martini (Palmarosa) Oil, Helianthus Annuus (Sunflower) Seed Oil, Citrus Junos Seed Oil, Sorbitan Isostearate

Did the ad claims hold up?

We checked 11 lines this product advertises against the ingredient list and public documents. One of them holds up. The rest are only partly right or have nothing behind them.

Claims translated from Korean, originals preserved.

backed by evidence1

  • Human application test results: [Subjects] 30 adult men and women aged 20-39 with insufficient sleep (habitually sleeping less than 6 hours), [Period] 2022.05.02 ~ 2022.06.10, [Test institution] P&K Skin Clinical Research Center Co., Ltd.
    Korean original

    인체적용시험결과 : [대상] 평상시 수면이 6시간 미만인 수면 부족한 만 20-39세의 성인 남녀 30명, [기간] 2022.05.02 ~ 2022.06.10, [시험 기관] 피앤케이피부임상연구센타(주)

partly backed5

  • Tone·Texture·Glow! A sleep pack with 6 whole yuzus that uses the brightening effect of vitamin P from yuzu to help recover skin fatigue and leave you with the radiant morning skin that comes from a good night's sleep.
    Korean original

    톤·결·광! 푹 자고 만나는 눈부신 아침 피부유자 유래 비타민P의 환한 브라이트닝 효과로 피부 피로 회복에 도움을 주어 눈부신 아침 피부로 가꿔주는 통유자 6개 듬뿍 수면팩

  • Sleep pack with plenty of whole yuzu* 6 pieces** / *Whole yuzu: uses yuzu peel, yuzu flesh, and yuzu seeds all as raw materials, **Based on yuzu peel oil content: yuzu peel oil 1kg = 22,500 yuzu fruits
    Korean original

    통유자* 6개** 듬뿍 들어있는 수면팩 / *통유자: 유자껍질, 유자과육, 유자씨를 모두 원료로 사용, **유자껍질오일 함량 기준: 유자껍질오일 1kg=22,500개의 유자

  • Step.01 Skin tone / Compared to before use, surface melanin decreased by 22% after 4 weeks of use / Step.02 Skin texture / Compared to before use, keratin amount decreased by 55% immediately after use / Step.03 Skin glow / Moisture immediately after use: +404% increase compared to before use immediately after use, moisture after 8 hours: +56% increase compared to before use after 8 hours of use
    Korean original

    Step.01 피부 톤 / 피부 표면 멜라닌 사용 전 보다 사용 4주 후 -22% 감소 / Step.02 피부 결 / 각질량 사용 전 보다 사용 직후 -55%감소 / Step.03 피부 광 / 사용 직후 수분량 : 사용 전 보다 사용 직후 +404% 증가, 8시간 후 수분량 : 사용 전 보다 사용 8시간 후 +56% 증가

  • Moisture +526%, 8-hour moisture persistence +93.2%, gloss +2.6% / when used in combination with Hanyul cream
    Korean original

    수분량 +526%, 8시간 수분 지속 +93.2%, 윤기 +2.6% / 한율 크림 병용 사용 시

  • Low-irritation test completed emblem, 10FREE emblem, wrinkle improvement and whitening functional emblem / Sensitive skin panel test completed emblem / Dermatology test completed emblem, allergy test completed, acne-prone skin suitability test completed
    Korean original

    저자극 테스트 완료 엠블럼, 10FREE 엠블럼, 주름개선 미백기능성 엠블럼 / 민감성 패널 테스트 완료 엠블럼 / 피부과 테스트 완료 엠블럼, 알러지 테스트 완료, 여드름 피부 사용 적합성 테스트 완료

overstated ad line2

  • The vitamin C ingredient contained in the Moonlight Yuja Sleep Pack is a stabilized vitamin derivative, so 'it is safe to use without sunscreen'.
    Korean original

    달빛유자 수면팩에 함유된 비타민C 성분은 안정화된 비타민 유도체로서 '자외선차단제 없이 사용하셔도 무방'합니다.

  • October ~ November, Goheung, Jeollanam-do, 100% domestically grown Goheung yuzu / 100% domestically grown, Goheung yuzu packed with 25 times more vitamin C than apples!
    Korean original

    10 ~11월 전라남도 고흥 국내 재배 100% 고흥 유자 / 국내재배 100%, 사과보다 25배 많은 비타민C 가득한 고흥 유자!

no evidence3

  • Vegan-certified 10 Free with unnecessary ingredients excluded
    Korean original

    불필요한 성분은 배제한 비건 인증 10 Free

  • Beauty Awards proven product power, 31 award wins* sleep pack *31 award wins: 5 in 18, 13 in 19, 6 in 20, 4 in 21, 3 in 22 | includes pre-renewal products
    Korean original

    뷰티어워즈가 증명하는 제품력 31관왕* 수면팩 *31관왕: 18년 5개, 19년 13개, 20년 6개, 21년 4개, 22년 3개 수상 | 리뉴얼 전 제품 포함

  • Skin fatigue relief & vitality charging effect felt the next day after use │ Research agency: Icon Co., Ltd. │ Subjects: 30 Korean women aged 25-39 │ Period: 2018.05.19~05.26
    Korean original

    사용하면 다음 날 느끼는 피부 피로 해소 & 생기 충전 효과 조사기관 : 아이콘(주) │ 조사대상 : 25-39세 한국여성 30명 │ 조사기간 : 2018.05.19~05.26

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.

How we read these lines

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Products we read alongside this one.

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Articles on this site that write about this product.