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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 known for addressing distinct needs through thoughtful formulations. The American heritage label offers nourishing moisturizers, targeted serums, soothing toners, and revitalizing eye products powered by glycerin and squalane, while the second brand is celebrated for its precise cleansers. Kiehl's suits mature skin and combination skin best with moisture-retention and barrier-supporting properties, whereas the alternative suits balanced to oily skin best. Ultimately, they differ through their core ingredient mechanisms and target complexions.

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 across this page than Principia, with higher Lovi fit levels for several skin types and concerns.

What is the difference between Kiehl's and Principia?

Kiehl's offers a wide range of products on this page fitting mature skin, combination skin, and skin with dark spots, while Principia lists only a single cleanser. Kiehl's features lightweight, non-greasy moisturizers and gentle serums, though some reviewers note a high price point and potential breakouts.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers, Kiehl's offers products on this page that generally have a High or Superior fit for oily and acne-prone skin, such as the Calendula Deep Cleansing Foaming Face Wash. In contrast, the Principia cleanser listed on this page shows only an Average fit for those skin types.

Which is more affordable, Kiehl's or Principia?

Reviewers often note that Kiehl's products have a high price point, whereas affordability details for Principia are not specified on this page.

Which causes fewer breakouts, Kiehl's or Principia?

Reviewers frequently note that Kiehl's products may cause breakouts and skin irritation. Principia is unlikely to present this issue on the products on this page.

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 much later in 2020 and is owned by Viziera Participações Ltda.

Which brand offers fragrance-free products across its entire page compared to Kiehl's?

Principia offers fragrance-free products across its entire page, whereas 2 out of 28 products on the Kiehl's page contain fragrance.

What are the main positive and negative reviews reported by users for Kiehl's skincare products?

Reviewers often report that Kiehl's products offer lightweight, non-greasy moisturizers and deep hydration, while some note issues with a high price point and potential breakouts or skin irritation.

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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