Sideritis Syriaca Extract: 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 Sideritis Syriaca Extract?

Sideritis Syriaca Extract comes from the whole plant of Sideritis syriaca, an herb native to the rocky mountains of Crete and other parts of the Mediterranean. Known locally as Greek mountain tea, the plant has long been brewed as an herbal infusion prized for its pleasant taste and soothing properties. Scientists later discovered that its aerial parts are rich in flavonoids, phenolic acids and essential oils, all of which show strong antioxidant activity. These findings inspired cosmetic formulators to explore the extract for skin care.

The extract is usually produced by drying the flowering tops, then using a gentle solvent such as water or a mix of water and glycerin to draw out the active compounds. The resulting liquid is filtered and concentrated to obtain a stable ingredient that can be easily blended into creams, serums and masks.

Today Sideritis Syriaca Extract appears in a range of topical products, especially those aimed at preventing premature aging, boosting hydration and supporting the skin’s natural defenses. You will most often see it listed in lightweight daily moisturizers, antioxidant serums, after-sun lotions, soothing masks and restorative night creams.

Sideritis Syriaca Extract’s Cosmetic Benefits/Uses

When added to a formula this botanical offers several skin friendly actions:

  • Antioxidant: Helps neutralize free radicals produced by UV exposure and pollution, which in turn supports a more even tone and reduces the look of fine lines
  • Skin Conditioning: Contributes to a softer smoother feel by helping the skin retain moisture and by providing a light calming effect suitable for sensitive complexions
  • Skin Protecting: Forms an extra layer of defense that reinforces the skin barrier, leaving it better equipped to cope with daily environmental stress

Who Can Use Sideritis Syriaca Extract

Sideritis Syriaca Extract is generally well tolerated by all skin types, including dry, normal, combination and oily. Its soothing nature makes it a good option for sensitive skin, although those with a history of plant allergies should proceed more carefully since the extract contains naturally occurring essential oil fractions that could trigger reactivity in very delicate complexions.

The ingredient is 100 percent plant derived so it is suitable for both vegans and vegetarians. No animal by-products or animal testing are involved in its manufacture when sourced from reputable suppliers.

Current research shows no specific concerns for pregnant or breastfeeding women when the extract is used topically at the low percentages found in cosmetics. That said, this information is not medical advice. Anyone who is pregnant or nursing should review their skincare routine with a qualified healthcare professional to be on the safe side.

Sideritis Syriaca Extract is not known to cause photosensitivity and can be used in both day and night products. It also plays well with common actives like vitamin C, niacinamide and hyaluronic acid, making it easy to slot into most routines.

Potential Side Effects/Adverse Reactions

Side effects from topical Sideritis Syriaca Extract differ from person to person. The points below outline potential reactions only. When the ingredient is formulated and used correctly most people will not experience any problems.

  • Mild redness or warmth
  • Transient stinging or tingling on very sensitive skin
  • Contact dermatitis in individuals allergic to plants of the Lamiaceae family
  • Rare delayed sensitisation with prolonged use of high-strength formulas

If any discomfort or irritation occurs stop using the product and consult a healthcare professional for further guidance.

Comedogenic Rating

Rating: 0 / 5

Sideritis Syriaca Extract is typically supplied as a water or water-glycerin solution with negligible amounts of lipids or heavy waxes, which means it is unlikely to clog pores. Its main bioactive compounds are flavonoids and phenolic acids, ingredients that do not sit on the skin’s surface in an occlusive way. For these reasons it earns a solid 0 on the comedogenic scale.

Because it is non-comedogenic this extract is generally considered suitable for those who are prone to acne or breakouts. As always overall formulation matters, so check the full ingredient list of any product if congestion is a concern.

Summary

Sideritis Syriaca Extract brings three key actions to skincare: it scavenges free radicals for antioxidant support, supplies soothing hydration for skin conditioning and reinforces the barrier for extra protection. These benefits stem from its natural mix of flavonoids, phenolic acids and trace essential oils that work together to calm and defend the complexion.

While Greek mountain tea is a household staple in Crete it remains a niche player in global cosmetics, although its clean plant origin and multitasking profile are helping it show up in more modern formulas each year.

Topical use is viewed as very safe with only rare reports of irritation in highly sensitive users. Still, skin is personal so it is wise to patch test any new product containing this extract before making it a regular part of your routine.

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