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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 moisturizers, serums, toners, eye products, and cleansers. The American brand, founded in 1851 and owned by L'Oréal S.A. since 2000, incorporates nourishing glycerin and squalane to suit skin with dark spots and combination skin best, while the second brand relies on precise formulas to suit balanced to oily skin best. Standout items include the first brand's Calendula Herbal-Extract Toner for acne-prone skin, its Calendula Deep Cleansing Foaming Face Wash for skin with dark spots, its Ultra Facial Toner for mature skin, and the second brand's Gel de Limpeza GL-01 for acne-prone skin. Both brands differ in their formulations, as the first utilizes glycerin to significantly increase hydration and restore epidermal barrier function alongside squalane to counteract oxidative stress and stimulate fibroblast migration, whereas the second 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 broader range of products on this page across multiple skin types compared to Principia. Kiehl's features high fit levels for combination skin and mature skin, whereas Principia lists only a single cleanser with average or low fit across most skin types.

What is the difference between Kiehl's and Principia?

Kiehl's offers a wide range of products on this page fitting skin with dark spots, combination skin, and mature skin, whereas Principia features only a single cleanser. Reviewers often mention Kiehl's lightweight, non-greasy moisturizers and gentle serums, though some users note a high price point and irritation.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers, Kiehl's offers products on this page with High to Superior fit levels for oily and acne-prone skin types, whereas Principia's cleanser has an Average fit for those same skin types.

Which is more affordable, Kiehl's or Principia?

Reviews for Kiehl's often note a high price point, while affordability details for Principia are not highlighted on this page.

Which causes fewer breakouts, Kiehl's or Principia?

Principia causes fewer breakouts compared to Kiehl's, as reviewers often note that Kiehl's products can cause breakouts and skin irritation.

When was Kiehl's founded compared to Principia?

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

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

Kiehl's offers products on this page with fragrance, while every Principia product lists no fragrance.

What are the main skin types that Kiehl's fits best according to its brand-focused routines?

According to its brand-focused routines, Kiehl's fits skin with dark spots, combination 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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