Rosmarinic Acid

Benefits
Tones Up SkinAntisepticElasticity ImprovementSoothingAntioxidant

What is Rosmarinic Acid?

Rosmarinic acid is a polyphenolic compound abundant in herbs from the Lamiaceae family, including rosemary, sage, and basil. It arises naturally through biosynthetic pathways in these plants, forming as an ester of caffeic acid and 3,4-dihydroxyphenyllactic acid. In cosmetics, it belongs to the antioxidant category, commonly featured in serums, creams, and toners. Functionally, it neutralizes free radicals to preserve formulation stability, preventing oxidation of oils and actives that could lead to rancidity or discoloration. Topically, it aids in countering environmental stressors that contribute to skin aging processes. Its water-soluble nature allows integration into diverse product textures, enhancing preservation without synthetic additives. Valued for potency at low levels, it complements other natural extracts in clean beauty formulations.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Antioxidant
Slows oxidation of oils, fragrances, and sensitive actives to improve shelf life and reduce rancidity or color change; sometimes also supports skin protection from oxidative stress.
Soothing
Helps reduce the feeling of discomfort and visible irritation by supporting skin calmness, often through anti-irritant, barrier-supporting, or cooling mechanisms.

Benefits

Delivers antioxidant action to shield against oxidative damage.

Offers soothing effects to calm skin discomfort.

Supports elasticity for firmer-feeling skin.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with sensitive or reactive skin seeking calm.
Anyone with allergies to rosemary or Lamiaceae herbs.
Those wanting protection from daily environmental stressors.
Those experiencing reactions to phenolic compounds.
People aiming to maintain skin tone and resilience.
Individuals without prior patch testing on new products.

Safety Notes

  • Rated low hazard in safety databases.
  • Non-comedogenic, suitable for acne-prone skin.

Frequently Asked Questions about Rosmarinic Acid

What is rosemarinic acid sourced from?

Primarily from rosemary and other Lamiaceae herbs like sage and basil.

How does it function in skincare?

Acts as an antioxidant to stabilize products and counter free radicals on skin.

Is it suitable for sensitive skin?

Yes, known for soothing properties and low irritation risk.