Thymus Quinquecostatus Water: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: June 30, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Thymus Quinquecostatus Water?

Thymus Quinquecostatus Water is the aromatic water collected when the whole Thymus quinquecostatus plant is steam-distilled. This East Asian thyme species is rich in naturally occurring phenols such as thymol and carvacrol along with flavonoids and minor terpenes that give the water its fresh herbal scent and skin-friendly properties. Traditional Korean and Chinese herbal practices prized the plant for its refreshing qualities which encouraged formulators to explore it for modern skincare. During production live or freshly harvested plants are placed in a still where hot steam breaks open the plant cells. The lightweight aromatic molecules rise with the steam then condense into a two-part distillate: an essential oil layer and a water layer. The water portion, already infused with trace volatile compounds, is separated filtered and preserved to create Thymus Quinquecostatus Water. Its gentle composition makes it a versatile base for toners, face mists, sheet masks, soothing gels, anti-aging serums, after-sun sprays and even lightweight scalp treatments.

Thymus Quinquecostatus Water’s Cosmetic Benefits/Uses

Formulators often include this ingredient to give products a subtle botanical boost while supporting overall skin health.

  • Antioxidant: The phenolic constituents help neutralize free radicals generated by UV light and pollution which in turn supports a more youthful look and can improve the shelf life of the formula itself
  • Skin Conditioning: The mild, water-based extract lightly hydrates calms temporary redness and leaves skin feeling smooth so it pairs well with moisturizers and soothing treatments

Who Can Use Thymus Quinquecostatus Water

This gentle distillate suits most skin types including oily, combination, normal and dry because it hydrates lightly without clogging pores or leaving a greasy film. Sensitive skin generally tolerates it well thanks to its low essential oil content yet anyone with a known allergy to thyme or other Lamiaceae herbs should approach with caution and consider alternative botanicals.

The ingredient is entirely plant derived and produced without animal by-products so it aligns with vegan and vegetarian lifestyles.

No specific warnings exist for topical use during pregnancy or breastfeeding since the water contains only trace levels of volatile compounds. Even so research is limited which is why pregnant or nursing users should check with their healthcare provider before adding new products as an extra safety step.

Thymus Quinquecostatus Water is not known to cause photosensitivity and it can be used year round without increasing sun sensitivity. It layers easily with common actives like niacinamide or hyaluronic acid and works on the face, body and scalp making it a versatile choice for a wide audience.

Potential Side Effects/Adverse Reactions

Responses to topical Thymus Quinquecostatus Water differ from person to person. The effects listed below are possible yet unlikely for most users when the ingredient is properly formulated and preserved.

  • Mild redness or stinging in very reactive or compromised skin
  • Allergic contact dermatitis in individuals sensitive to thyme, oregano or related herbs
  • Transient itching or tingling when applied to freshly exfoliated or broken skin
  • Eye irritation if the watery solution accidentally enters the eyes

If irritation or any other adverse effect occurs stop use immediately and consult a qualified healthcare professional.

Comedogenic Rating

Rating: 0 / 5. Thymus Quinquecostatus Water is almost entirely water with only trace levels of light aromatic molecules so it lacks the heavy lipids or waxes that can block pores. Its rapid absorption and non-oily finish mean it will not sit on the skin long enough to trap debris or sebum. This makes it suitable for people who are prone to acne or frequent breakouts. Because the distillate is water based it also mixes well with other non-comedogenic ingredients, keeping the overall formula light.

Summary

Thymus Quinquecostatus Water offers two key benefits: antioxidant protection and gentle skin conditioning. The naturally occurring phenols mop up free radicals created by sun exposure and pollution while the light watery base delivers a quick hit of hydration that leaves skin feeling soothed and refreshed. Although not as famous as rose or lavender waters this thyme distillate is gaining traction in K-beauty toners, mists and after-sun gels thanks to its clean herbal scent and low irritation profile.

Overall it is considered very safe for topical use with minimal risk of clogging pores or triggering sensitivities. As with any new skincare ingredient it is still smart to do a small patch test first to confirm personal tolerance before applying it liberally.

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