Lavender Oil (Lavandula Angustifolia): Aromatherapy and Cosmetic Use

Lavender oil, obtained from the flowering aerial parts of Lavandula angustifolia Mill. (Lamiaceae family) through steam distillation, is one of the most widely used and most researched essential oils in the world. Its name is derived from the Latin word "lavare" (to wash)—the Romans used lavender in their baths. With main components of linalool (25–45%) and linalyl acetate (25–47%), lavender oil is an indispensable ingredient in the aromatherapy and cosmetic industries. This monograph addresses lavender oil as a cosmetic ingredient; it makes no claims of therapeutic or healing properties.

This article is not a product promotion. It is a cosmetic ingredient monograph; it is not product or treatment advice.

Botanical Source and History

Lavandula angustifolia Mill. (true lavender / English lavender) is a perennial, aromatic, herbaceous plant native to the Mediterranean basin, growing 30–60 cm tall. Its narrow leaves are gray-green, and its flowers are characteristically lavender-blue. Over six thousand lavender varieties are described worldwide; however, essential oil of cosmetic and aromatherapy quality is primarily derived from L. angustifolia.

The history of lavender use extends back to Ancient Egypt. In Ancient Rome, it was used in baths and laundry; the plant's name derives from this usage ("lavare"—to wash). Today, the centers of commercial lavender cultivation are France (Provence), Bulgaria, England, and Turkey. In Turkey, Isparta is the center of lavender cultivation and is known as "Turkey's lavender capital"; the Kuyucak district of Isparta, with its purple lavender fields and lavender festival, has gained international recognition.

Chemical Profile and International Standard

Lavender oil contains more than 100 components. The ISO 3515 international standard defines quality parameters for genuine lavender oil. Composition may vary depending on geographic origin, harvest time, and distillation conditions.

Linalool (25–45%)

Linalool, the main component of lavender oil, is one of the monoterpene alcohols and occurs naturally in over 200 plant species. In a study by Peana and colleagues (2002), linalool demonstrated anti-inflammatory activity in an in vivo experimental model, and this effect was observed in the natural form. This is a research finding regarding the chemical behavior of the substance.

Linalyl Acetate (25–47%)

Linalyl acetate, the second main component of lavender oil, is the acetate ester of linalool and is the primary source of the oil's characteristic "sweet-floral" scent profile. From a cosmetic standpoint, the signature scent note of lavender oil derives from this component.

Other Components

Other components of lavender oil include lavandulol, lavandulyl acetate, 1,8-cineol (eucalyptol), camphor, β-caryophyllene, terpinen-4-ol, and limonene. Oils with low camphor content are rated as cosmetic grade; high camphor content suggests admixture with "spike lavender" (L. latifolia) (Białoń et al., 2019).

In Vitro Microbiology Research

In a review by Cavanagh and Wilkinson in Phytotherapy Research (2002), lavender oil was reported to show activity against gram-positive bacteria (especially Staphylococcus aureus), some gram-negative bacteria, and certain fungal species under in vitro conditions. In a study by Białoń and colleagues (2019), lavender oil with higher monoterpenoid content showed more pronounced effects on facial skin microbiota. These findings pertain to laboratory conditions; medical/clinical uses of the substance (e.g., clinical aromatherapy studies) fall within the context of medicinal products and are outside the scope of this cosmetic monograph and do not constitute a product efficacy claim.

Safety Profile

General Assessment

Lavender oil has a relatively gentle profile among essential oils. The CIR (Cosmetic Ingredient Review) panel has evaluated lavender oil as safe for use in cosmetic products. It exhibits low irritation potential in topical use.

Allergen Notification and Oxidation

Linalool and linalyl acetate are listed as allergen-notification components in the EU Cosmetics Regulation (EC/1223/2009); when exceeding certain concentration thresholds (0.001% in rinse-off products, 0.01% in leave-on products), they must be separately noted on the INCI list. A critical point: it is not linalool itself but its oxidation products (linalool hydroperoxides) that are the primary source of contact allergy risk. For this reason, the use of fresh, properly stored (dark, cool, closed container) lavender oil is important for safety (Bickers et al., 2003).

Concentration Note

Essential oils should be used in dilution; in in vitro studies, high concentrations have been reported to have cytotoxic effects on skin cells; this underscores the importance of using lavender oil in appropriate proportions in soap formulas. (In vitro conditions do not directly mirror real-world use conditions.)

Lavender Oil in Soap Making

Addition Timing and Usage Rate

In cold-process soap making, lavender oil is added at trace stage; adding it at light-to-medium trace minimizes contact time with the alkaline medium, better preserving component structure. It is typically used at 3–5% of total oils; IFRA guidelines define safe usage limits for topical products.

Scent Profile, Retention, and Blending

Lavender oil imparts a "clean, floral, soothing" scent profile to soap. Its scent retention capacity is moderate; when using purely natural essential oil, the scent may fade within a few months. For greater longevity, blending with lavandin (L. × intermedia) or base notes such as patchouli or cedar is an option. It creates compatible blends with other essential oils: with tea tree for "clean-botanical," with eucalyptus for "refreshing," with peppermint for "invigorating," and with orange for "sweet-floral."

Frequently Asked Questions

What is lavender oil?

Lavender oil is an essential oil obtained through steam distillation from the flowers of Lavandula angustifolia. With main components of linalool (25–45%) and linalyl acetate (25–47%), it is one of the world's most widely used essential oils.

What does lavender oil do in soap?

It imparts a clean, floral, and soothing scent profile to soap. It is added at trace stage at a rate of 3–5% of total oils. It creates compatible blends with other essential oils such as tea tree, eucalyptus, peppermint, and orange.

Is lavender oil an allergen?

Linalool and linalyl acetate are listed as allergen-notification components in the EU Cosmetics Regulation. The primary source of allergic reactions is not the fresh oil itself but its oxidation products (linalool hydroperoxides); the risk is lower in fresh, properly stored oil.

Why is Isparta lavender recognized?

The Kuyucak district of Isparta is the center of Turkey's lavender cultivation, and with its purple lavender fields and lavender festival, it has gained international recognition.

Chailea Products Containing This Ingredient

• Natural Lavender Soap 100 g
• Natural Activated Charcoal Soap 100 g

References

• Cavanagh HMA, Wilkinson JM. Biological activities of lavender essential oil. Phytotherapy Research, 2002; 16(4):301-308. PMID: 12112282. PubMed. (Biological activity literature; medical/clinical uses of the substance fall outside the scope of this cosmetic monograph.)
• Peana AT, D'Aquila PS, Panin F, et al. Anti-inflammatory activity of linalool and linalyl acetate constituents of essential oils. Phytomedicine, 2002; 9(8):721-726. PMID: 12587692. PubMed.
• Białoń M, Krzyśko-Łupicka T, et al. Chemical Composition of Two Different Lavender Essential Oils and Their Effect on Facial Skin Microbiota. Molecules, 2019; 24(18):3270. PMID: 31500359. PubMed.
• Bickers D, Calow P, Greim H, et al. A toxicologic and dermatologic assessment of linalool and related esters. Food and Chemical Toxicology, 2003; 41(7):919-942. PMID: 12804649. PubMed.
• ISO 3515 — Oil of lavender (Lavandula angustifolia Mill.). · IFRA — Lavender Oil usage standards. · CIR — Safety Assessment of Lavandula Angustifolia Oil.