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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 that offer thoughtfully crafted daily formulas. Kiehl's is an American brand founded in 1851 and owned by L'Oréal S.A. since 2000, known for nourishing moisturizers, serums, toners, eye products, and cleansers with glycerin and squalane that suit combination and mature skin best. Meanwhile, the second brand is beloved for its thoughtful cleansers and precise formulas that suit balanced to oily skin best. While both help maintain a healthy, balanced complexion, they differ through their distinct heritage, ingredient profiles, and ideal skin types.

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, which features only a single cleanser. Reviewers often mention lightweight moisturizers and gentle serums for Kiehl's, though some note a high price point.

What is the difference between Kiehl's and Principia?

Kiehl's features a large selection of 28 products on this page tailored for combination, mature, and dark-spot-prone skin, whereas Principia lists only one cleanser. The products on this page from Kiehl's are frequently reviewed as lightweight and hydrating, and 26 of them list no fragrance.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers, the products on this page show that Kiehl's generally fits a wider variety of skin types better than Principia, with options like Calendula Deep Cleansing Foaming Face Wash achieving superior fit levels for oily and acne-prone skin.

Which is more affordable, Kiehl's or Principia?

When comparing affordability, the products on this page for Kiehl's are frequently noted by reviewers for having a high price point.

Which causes fewer breakouts, Kiehl's or Principia?

Principia is not associated with breakouts on this page, whereas reviewers often note that Kiehl's causes breakouts and skin irritation. The products on this page from Kiehl's fit acne-prone skin with levels ranging from Superior to Caution depending on the specific item.

How do the founding years and corporate ownership 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 more recently in 2020 and is owned by Viziera Participações Ltda.

Which brand offers more fragrance-free products according to their page listings?

Kiehl's offers more fragrance-free products on this page, with 26 out of 28 options listing no fragrance, while Principia lists only one fragrance-free product.

What are the main skin types that Kiehl's routines are designed to fit best?

Kiehl's brand-focused routines are designed to fit combination skin, mature skin, and skin with dark spots 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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