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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 cherished for formulations anchored by nourishing ingredients like glycerin and squalane, while the second is widely loved for precise formulas. Both cater to distinct needs, as the American brand suits skin with dark spots and mature skin best, whereas its counterpart suits balanced to oily skin best. They ultimately differ in their key offerings and target concerns, providing tailored relief through specialized items like the Calendula Herbal-Extract Toner and the Gel de Limpeza GL-01.

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 selection of products on this page across multiple skin types compared to Principia. The products on this page for Kiehl's fit skin with dark spots, mature skin, and dry skin best.

What is the difference between Kiehl's and Principia?

Kiehl's features a broad selection of twenty-eight skincare products on this page covering multiple skin types and routines, whereas Principia lists only one cleanser. Kiehl's best fits skin with dark spots, mature skin, and dry skin.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers, the products on this page show that Kiehl's offers options with High to Superior fit levels across multiple skin types, whereas Principia's single cleanser lists lower average and caution fit levels.

Which is more affordable, Kiehl's or Principia?

The provided page does not contain pricing information for either Kiehl's or Principia, so affordability cannot be compared here. Reviewers do note that Kiehl's products have a high price point.

Which causes fewer breakouts, Kiehl's or Principia?

Principia lists only one cleanser on this page, while reviewers note that Kiehl's products frequently cause breakouts and skin irritation.

When was Kiehl's founded and who is its parent company compared to Principia?

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 Kiehl's toner achieves a Superior Lovi fit for sensitive and acne-prone skin?

The Calendula Herbal-Extract Toner by Kiehl's achieves a Superior Lovi fit for both sensitive and acne-prone skin.

How many Kiehl's products on the page contain fragrance, and does Principia have any fragranced products?

On the Kiehl's page, 2 of the 28 products list fragrance, while Principia has no fragranced products among the products 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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