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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 two distinct skincare lines known for addressing different dermal needs through specialized formulations. The American heritage brand relies on dependable ingredients like glycerin and squalane in its nourishing moisturizers, targeted serums, soothing toners, and gentle eye products, which suit mature skin and sensitive skin best. Meanwhile, the second line is widely loved for its thoughtful cleansers and precise formulas that suit balanced to oily skin best, helping maintain a healthy, balanced complexion. Ultimately, both differ because the former focuses on barrier-supporting hydration and antioxidant protection, whereas the latter specializes in clarifying care.

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 report a high price point and skin irritation.

What is the difference between Kiehl's and Principia?

Kiehl's offers a wide range of products on this page fitting mature skin, sensitive skin, and skin with dark spots well, whereas Principia features only a single cleanser with lower fit levels for most skin types. Reviewers often mention lightweight moisturizers and gentle serums for Kiehl's, alongside a higher price point and occasional breakouts.

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, such as the Calendula Deep Cleansing Foaming Face Wash, whereas the single 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 not linked to breakouts on this page, whereas reviewers often note that Kiehl's causes breakouts and skin irritation.

How do the founding years and corporate ownerships of Kiehl's and Principia compare?

Kiehl's was founded in 1851 in the United States and has been owned by L'Oréal S.A. since 2000, whereas Principia was founded in 2020 and is owned by Viziera Participações Ltda.

Which of the two brands offers a wider variety of skincare products on the page, and what are their specific fit levels for oily skin?

Kiehl's offers a much wider variety of skincare products on this page, whereas Principia features only a single cleanser. For oily skin, Kiehl's product fit levels vary significantly by item, showing Superior fit for products like Calendula Herbal-Extract Toner and Rare Earth Deep Pore Daily Cleanser, High fit for several cleansers and serums, Average fit for many moisturizers and treatments, and Low fit for items such as Ultra Facial Cream and Midnight Recovery Concentrate, while Principia's Gel de Limpeza GL-01 has an Average fit.

How does the presence of fragrance differ between the product lines of Kiehl's and Principia?

Among the products on this page, almost all Kiehl's items are fragrance-free except for Age Defender Moisturizer and Facial Fuel Energizing Moisture Treatment for Men, whereas every single Principia product lists no fragrance.

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

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