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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 two skincare brands offering diverse solutions for daily routines. Kiehl's is loved for its nourishing moisturizers, targeted serums, soothing toners, and gentle eye products formulated with glycerin and squalane, suiting dry skin and mature skin best. Meanwhile, the second brand is widely loved for its thoughtful cleansers and precise formulas that suit balanced to oily skin best. While both help maintain a healthy complexion, they differ through their distinct ingredient profiles and the specific skin types they address.

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?

When comparing the products on this page, Kiehl's generally offers a much wider selection across various skin types and concerns than Principia. For instance, Lovi rates the Kiehl's Hydro-Plumping Serum Concentrate as Superior for dry skin.

What is the difference between Kiehl's and Principia?

Kiehl's features a broad selection of products on this page spanning cleansers, toners, serums, and moisturizers that fit dry skin and mature skin well, whereas Principia lists only a single cleanser. Furthermore, Kiehl's is owned by L'Oréal S.A. and offers multiple fragranced options, while Principia lists no fragrance in its ingredients.

Kiehl's or Principia: which cleanser is better?

When comparing cleansers on these pages, Kiehl's offers options that Lovi rates as superior for oily and oily acne-prone skin, such as the Calendula Deep Cleansing Foaming Face Wash and Rare Earth Deep Pore Daily Cleanser, while Principia lists only a single cleanser with average fits for those skin types.

Which is more affordable, Kiehl's or Principia?

Reviewers on the Lovi page often mention that Kiehl's has a high price point, but the page does not provide pricing or affordability data for Principia.

Which causes fewer breakouts, Kiehl's or Principia?

Principia is not linked to breakouts on this page, whereas reviewers note that Kiehl's may sometimes 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.

How many products from Kiehl's contain fragrance, and does Principia include fragrance in its products?

Kiehl's has 26 out of 28 products on this page listing no fragrance, meaning 2 products contain fragrance, whereas every product on this page from Principia lists no fragrance in its ingredients.

Which brand offers a greater variety of products for dry skin according to the page?

According to the page, Kiehl's offers a greater variety of products for dry skin, featuring multiple moisturizers, cleansers, and toners with high or superior Lovi fit levels for dry skin, whereas Principia lists only a single cleanser that is cautioned for dry skin.

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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