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Kiehl's vs Principia

Rated by Lovi · Unbiased, science-based skincare AI trained on real user outcomes · How the Fit score works

Kiehl's and Principia are skincare brands offering targeted solutions for diverse complexions. Kiehl's is an American brand founded in 1851 and owned by L'Oréal S.A. since 2000, beloved for moisturizers, serums, toners, eye products, and more featuring key ingredients like glycerin and squalane. Meanwhile, the second brand is widely loved for its thoughtful cleansers and precise formulas. The first brand suits dry skin and sensitive skin best, while its counterpart suits balanced to oily skin best.

Kiehl's is an American skincare brand founded in 1851 and owned by L'Oréal S.A. since 2000.

loreal.comen.wikipedia.org

This page compares some of the most popular Kiehl's and Principia products; for every product of both brands, with a fit score for your own skin, use the Lovi app.

Popular Kiehl's vs Principia products

Questions and answers

Kiehl's or Principia: which is better?

Kiehl's offers a much broader range of products on this page across multiple skin types compared to Principia. Reviewers note that Kiehl's provides lightweight moisturizers and gentle serums, though some users mention a high price point or potential skin irritation.

What is the difference between Kiehl's and Principia?

Kiehl's offers a wide range of products with varied fit levels for dry, sensitive, and mature skin, whereas Principia lists only a single cleanser on this page. Kiehl's products frequently feature key ingredients like glycerin and Vitamin C, and most of the items on this page are fragrance-free.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers, Kiehl's offers options that achieve a Superior fit for oily and acne-prone skin types, such as the Calendula Deep Cleansing Foaming Face Wash. In contrast, the cleanser on the Principia page only reaches an Average fit for those skin types.

Which is more affordable, Kiehl's or Principia?

The provided page facts do not contain pricing information to determine whether Kiehl's or Principia is more affordable.

Which causes fewer breakouts, Kiehl's or Principia?

Principia is unlikely to cause breakouts as its products on this page have a low fit for acne-prone skin, whereas Kiehl's features several products with high fit levels for acne-prone skin alongside reviewer mentions of potential breakouts.

When was Kiehl's founded compared to Principia?

Kiehl's was founded in 1851, whereas Principia was founded in 2020.

Which brand offers products with fragrance, Kiehl's or Principia?

Kiehl's offers products with fragrance, whereas Principia lists no fragrance for any of the products on this page. Specifically, 26 of 28 products on the Kiehl's page list no fragrance, while the Age Defender Moisturizer and Facial Fuel Energizing Moisture Treatment for Men do contain fragrance.

Which skin types does Kiehl's fit best according to its brand-focused routines?

According to its brand-focused routines, Kiehl's fits dry skin, sensitive skin, and mature skin best.

Research behind their key ingredients

Behind this comparison

Lovi compares products by their fit scores, calculated from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.

  • Nadia Kapleva, MS

    Nadia Kapleva, MS

    Co-founder, Medical Director

    Cosmetic chemist, cosmetologist, aesthetic products developer

  • Alexey Shagraev, PhD

    Alexey Shagraev, PhD

    Co-founder, CEO and CTO

    PhD in computer science, 3x US patent holder, ex-Google, ex-Yandex

  • Dr. Sofía Perea Pérez, MD, MSc

    Dr. Sofía Perea Pérez, MD, MSc

    Medical Board

    Aesthetic medicine practitioner, MSc in Longevity and Anti-Aging Medicine

  • Aishani Shah, MD

    Aishani Shah, MD

    Medical Board

    Specialist dermatologist, MBBS, MD, IFAAD

  • Asya Zubkova, MS

    Asya Zubkova, MS

    Medical Board

    Cosmetic chemist, SCS, IFSCC member

  • Hanna Kurets, MD

    Hanna Kurets, MD

    Medical Board, Medical Advisor

    Dermatology MD

  • Elina Nazarenko, MD

    Elina Nazarenko, MD

    Medical Board

    Dermatology and diagnostic consultant

  • Victoria Derkova, MS

    Victoria Derkova, MS

    Medical Board

    Cosmetic chemist, cosmetic development technologist

How does it fit your skin?

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