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Moumoujus

ROSMARINUS OFFICINALIS STEM OIL.

Valuable CAS 84604-14-8 / PERFUMING

Rosmarinus Officinalis Stem Oil, a concentrated oil derived from the rosemary plant, is prized for its diverse biological activities in cosmetic applications. It offers a multi-functional approach to improving skin health, addressing concerns from signs of aging to blemish management and supporting overall skin vitality.

Summary

Antioxidant Anti-inflammatory Antimicrobial Antibacterial Fragrance Astringent Stimulates Cell Renewal Promotes Blood Flow

Science

Mechanism of Action

This ingredient functions primarily through its antioxidant properties, actively combating free radicals and thereby helping to prevent premature skin aging. Its anti-inflammatory action can assist in calming irritated skin and diminishing visible puffiness. Furthermore, it exhibits antimicrobial and antibacterial capabilities, which are beneficial for managing breakouts and pore congestion by reducing acne-causing bacteria. When applied topically, it may enhance microcirculation in the skin's superficial layers, promoting superior oxygen and nutrient delivery to cells, which in turn accelerates repair, regeneration, and contributes to a natural radiance. Its astringent qualities help to regulate sebum production in oily skin and can visibly reduce the appearance of enlarged pores, alongside stimulating cellular renewal.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A cosmetic formulation containing 1.5% Rosmarinus officinalis (rosemary) leaf oil was clinically confirmed to be neither an irritant nor a sensitizer in a Human Repeated Insult Patch Test (HRIPT) conducted on 104 subjects.
  2. 02 Rosmarinus officinalis (rosemary) leaf oil, prepared at a 10% concentration in petrolatum, demonstrated no irritant potential in a 48-hour closed patch test.
  3. 03 For scalp applications, undiluted rosemary essential oil, when massaged twice daily for six months, showed comparable efficacy to 2% minoxidil in increasing hair thickness for androgenetic alopecia, while also reducing scalp itching.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

For optimal potency and to prevent oxidative degradation, Rosmarinus Officinalis Stem Oil should be stored in airtight containers between 15°C and 25°C, in a cool, dark, and dry environment. Extremely low temperatures, such as refrigeration, can alter the oil's consistency and physical structure, and may lead to microbial contamination due to condensation.

Conflicts

  • Requires dilution with a carrier oil for topical application to the skin to prevent irritation.
  • A patch test is recommended before widespread use, particularly for individuals with sensitive skin.
  • May induce photosensitivity; therefore, it is best applied at night or strictly with concurrent, diligent sunscreen application during the day.
  • Should be avoided during pregnancy or nursing, and by individuals with diagnosed epilepsy or high blood pressure due to its stimulating properties.

Safety

Safety Profile

CIR Status
Safe as used
Max tested
1.5%
Pregnancy
Caution
Sensitization risk Moderate

The CIR Expert Panel considers Rosmarinus officinalis (rosemary)-derived ingredients, including leaf oil, safe for cosmetic use when formulated to be non-sensitizing. A 1.5% concentration in a formulation was specifically tested as non-irritant and non-sensitizing. However, this oil must be diluted with a carrier oil to prevent skin irritation. It contains natural compounds like camphor and cineol which can trigger allergic reactions or skin sensitivities in some individuals, particularly those with inherently sensitive skin. Due to its stimulating properties, its use is contraindicated for pregnant women, individuals with epilepsy, or those with high blood pressure. Furthermore, rosemary oil may heighten the skin's sensitivity to sunlight (photosensitivity), necessitating its use at night or strict adherence to sunscreen application. Cosmetic labels are required to declare fragrance allergens present in rosemary if their concentration surpasses 0.001% in leave-on products.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
No Sensitive
Irritancy Medium
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Rosmarinus Officinalis Stem Oil is a valuable multi-functional ingredient offering significant antioxidant, anti-inflammatory, and antimicrobial benefits, but its moderate irritancy, potential photosensitivity, and specific contraindications necessitate precise formulation and careful usage.

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