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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 thoughtful selections of cleansers, moisturizers, serums, toners, and eye products. The first brand is anchored by glycerin and squalane, suiting skin with dark spots and dry skin best, while the second brand features precise formulas that suit balanced to oily skin best. Both brands provide standout products for particular concerns, such as acne-prone skin. Ultimately, they differ through their key ingredients and targeted skin types, as the American brand focuses on hydration and barrier function, while Principia helps maintain a healthy, balanced complexion.

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 wider selection of products on this page compared to Principia, with many formulas achieving high Lovi fit levels for skin types such as dry skin and mature skin. Reviewers often mention that Kiehl's provides deep hydration and lightweight moisturizers, though some also note a high price point and potential skin irritation.

What is the difference between Kiehl's and Principia?

Kiehl's offers a wide range of products on this page featuring items with high Lovi fit levels for dry, mature, and dark-spot-prone skin, whereas Principia lists only a single cleanser. Reviewers often mention that Kiehl's provides deep hydration and lightweight moisturizers, though some note a high price point.

Kiehl's or Principia: which cleanser is better?

Kiehl's offers several cleansers with High and Superior Lovi fit levels for oily and acne-prone skin, whereas the cleanser on the Principia page generally has lower fit ratings. Reviewers frequently note that Kiehl's cleansers provide effective cleansing alongside lightweight textures.

Which is more affordable, Kiehl's or Principia?

Reviewers often note that the products on this page by Kiehl's have a high price point, whereas Principia is not specifically mentioned for high pricing.

Which causes fewer breakouts, Kiehl's or Principia?

Principia causes fewer breakouts than Kiehl's because reviewers often note that Kiehl's products cause breakouts and skin irritation.

When was Kiehl's founded compared to Principia?

Kiehl's was founded in 1851 in the United States, whereas Principia was founded much later, in 2020.

Which brand offers a cleanser rated as Superior for oily skin?

Kiehl's offers cleansers rated as Superior for oily skin among the products on this page, including the Calendula Deep Cleansing Foaming Face Wash and the Rare Earth Deep Pore Daily Cleanser.

Do Kiehl's or Principia products contain fragrance?

Most Kiehl's products on this page list no fragrance, while two products contain fragrance. Principia lists no fragrance for every product on this page.

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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