Red Thyme EO

In a study, red thyme eo repelled 83, 82 and 68% of ticks when diluted to 3%, respectively.

This monograph specifies the characteristics, requirements, and test methods for Red Thyme essential oil obtained by steam distillation of the flowering aerial parts of Thymus vulgaris L. and/or Thymus zygis L. (thymol chemotype). It covers quality parameters, chemical composition, and safety considerations for use in aromatherapy, perfumery, cosmetics, flavoring, and pharmaceutical applications. Red Thyme refers to the primary, unrectified distillate, which is richer in phenols and typically darker in color than rectified (White) Thyme oil.

Normative References

ISO 4720 — Essential oils — Nomenclature
ISO 210 — Essential oils — General requirements for packaging, conditioning and storage
ISO 211 — Essential oils — General requirements for labelling
ISO 19817:2017 — Essential oil of thyme [Thymus vulgaris L. and Thymus zygis L.], thymol type
ISO 11024 series — Essential oils — General guidance on chromatographic profiles

Terms and Definitions

For the purposes of this document, the terms and definitions given in ISO 4720, ISO 210, and ISO 19817 apply.

Red Thyme Essential Oil: The primary steam-distilled volatile oil from the flowering tops of Thymus vulgaris L. and/or Thymus zygis L., characterized by high thymol content and a reddish to orange-brown color due to phenolic compounds and distillation conditions.4. Botanical Origin and Description

Botanical Name: Thymus vulgaris L. and/or Thymus zygis L. (thymol chemotype)

Plant Family: Lamiaceae (Labiatae)

Common Names: Red Thyme, Thyme oil (red), Common thyme, Spanish thyme (for T. zygis).

Plant Description: Perennial aromatic subshrub native to the Mediterranean region, widely cultivated in Spain, France, and other Mediterranean countries. It features small, opposite leaves and clusters of small white to lilac flowers. The plant is highly glandular and rich in essential oil.

Part Used: Fresh or partially dried flowering aerial parts (leaves and flowering tops).

Production Method

Obtained by steam distillation of the flowering aerial parts. Red Thyme is the primary distillate; further rectification produces White Thyme oil. Yield typically ranges from 0.5–2.5% depending on species, chemotype, origin, and harvest conditions. Major production occurs in Spain and other Mediterranean regions.

Organoleptic and Physical Properties

Appearance: Mobile liquid, reddish-orange to reddish-brown or amber (due to high phenolic content and natural pigments).
Odor: Strong, warm, herbaceous, spicy, phenolic, and medicinal with sweet, woody undertones.
Relative Density (20°C): 0.910 – 0.937 (typical range).
Refractive Index (20°C): 1.494 – 1.504.
Optical Rotation (20°C): Usually slightly laevorotatory to near 0°.
Solubility: Soluble in alcohol and fixed oils; insoluble in water.
Perfumery Note: Middle note.

Chemical Composition

Red Thyme essential oil belongs to the thymol chemotype. Major constituents (area % by GC-FID, per ISO 19817 guidelines) typically include:

Thymol: 37–55% (often 40–50%, primary active component).
p-Cymene:10–28%.
γ-Terpinene: 4–20%.
Carvacrol: 0.5–5% (variable).
β-Caryophyllene: 1–5%.
Other components: Linalool, borneol, α-terpineol, myrcene, and minor monoterpenes.

The high phenolic content (thymol + carvacrol) defines its potency and color. Full GC-MS analysis is required for authentication and compliance with ISO 19817 chromatographic profile standards.

Requirements

Commercial Red Thyme essential oil should meet the following typical specifications (ISO 19817 thymol type):

Thymol content: 37–55%.
Sum of thymol + carvacrol: Minimum 40–60% depending on grade.
Chromatographic profile within accepted ranges for major components.
Free from adulterants (e.g., synthetic thymol or other essential oils).
Compliance with heavy metal, pesticide residue, and microbial limits per relevant regulations.
Organoleptic properties consistent with a high-phenol thymol chemotype.

Therapeutic and Functional Properties

Antimicrobial and Antifungal: Potent broad-spectrum activity due to thymol and carvacrol.
Antioxidant and Anti-inflammatory: Strong radical scavenging and supportive effects on inflammatory responses.
Respiratory Support: Traditionally used as an expectorant and for respiratory comfort.
Other: Antispasmodic, digestive aid, and immune-supportive properties.

Red Thyme is considered more potent than rectified White Thyme.

Blending and Applications

Blends well with lavender, rosemary, oregano, lemon, eucalyptus, tea tree, and other Lamiaceae oils.

Used in:

Aromatherapy (diluted) for immune and respiratory support.
Natural perfumery and masculine fragrances.
Cosmetics and personal care (soaps, cleansers).
Flavoring and food preservation (regulated low levels).
Pharmaceutical and disinfectant formulations.

Safety and Toxicology

Red Thyme essential oil is a potent skin and mucous membrane irritant/sensitizer due to its high phenolic content.

Dermal Use: Maximum recommended dilution 0.5–1% after patch testing.
Contraindications: Avoid undiluted use, eyes, mucous membranes, and damaged skin. Use with caution during pregnancy, breastfeeding, and in children. Not recommended for hypersensitive individuals or those with high blood pressure (in high doses).
Storage: Cool, dark place in airtight amber glass containers (per ISO 210). Shelf life: 2–3 years under proper conditions.

Labelling and Packaging

Labelling shall comply with ISO 211, including full botanical name, chemotype (thymol), production method (steam distilled), origin, batch number, and “Red Thyme” designation where applicable. Use approved materials per ISO 210.13. Test Methods

Organoleptic evaluation.
GC-MS / GC-FID for chromatographic profile (ISO 19817 and ISO 11024).
Physical constants (density, refractive index, optical rotation).
Sensory and stability testing as required.