Everlasting Flower

Everlasting Flower (Helichrysum stoechas) is rich in polyphenolic compounds—including flavonoids, chalcones, and sesquiterpenes—that exert potent antioxidant, anti-inflammatory, and cardiovascular protective effects by inducing vasorelaxation through the endothelium-dependent NO/PKG/cGMP signaling pathway while modulating Ca²⁺-activated K⁺ channels and L-type Ca²⁺ channels (PMID 35739989; PMID 36430899). A 2022 study in Antioxidants demonstrated that Helichrysum stoechas polyphenolic extract produced dose-dependent relaxation in precontracted rat aorta, supporting its potential as an antihypertensive and spasmolytic agent, while related species such as H. italicum and H. arenarium contribute additional wound-healing, anti-aging, and TNF-α–inhibitory bioactivities (PMID 24239849; PMID 19336929).

Origin & History

The Everlasting Flower, Helichrysum italicum, also known as "Immortelle," is native to the Mediterranean region, thriving in rocky, sun-drenched soils. Renowned for its vibrant golden blooms that retain color when dried, this aromatic plant has been used for centuries in traditional medicine. It is celebrated for its powerful anti-inflammatory and skin-regenerating properties, making it a prized botanical in functional skincare and natural remedies.

Historical & Cultural Context

The Everlasting Flower, or Immortelle, has been revered in Mediterranean cultures for centuries, symbolizing immortality and healing. In Mediterranean folk medicine, Helichrysum was traditionally used as an herbal tea or infused oil to treat wounds, inflammation, and respiratory issues. Its enduring beauty and therapeutic properties are deeply embedded in ancient rituals and natural remedies.

Health Benefits

- **Promotes skin regeneration**: by stimulating collagen synthesis, reducing scarring, and improving elasticity.
- **Reduces inflammation and**: soothes irritated skin and joints through its rich content of flavonoids and sesquiterpenes.
- **Combats oxidative stress**: and supports cellular health via polyphenols, contributing to anti-aging effects.
- **Accelerates wound healing**: for cuts, burns, and bruises due to its reparative properties.
- **Alleviates anxiety and**: promotes relaxation through the calming effects of its essential oil.

How It Works

The polyphenolic extract of Helichrysum stoechas induces vasorelaxation primarily through the endothelium-dependent nitric oxide (NO)/protein kinase G (PKG)/cyclic guanosine monophosphate (cGMP) signaling cascade; this pathway is abolished by the NO synthase inhibitor L-NAME and the PKG inhibitor Rp-8-Br-PET-cGMPS, confirming endothelial NO release as the initiating event (PMID 35739989). Downstream, the extract activates multiple Ca²⁺-activated K⁺ channel subtypes—including intermediate-conductance (IKCa, blocked by TRAM-34), small-conductance (SKCa, blocked by apamin), and ATP-sensitive (KATP, blocked by glibenclamide) channels—resulting in smooth muscle hyperpolarization and relaxation (PMID 36430899). Concurrently, L-type voltage-gated Ca²⁺ channels are inhibited, reducing intracellular Ca²⁺ influx necessary for vascular smooth muscle contraction. In parallel, flavanone glycosides such as arenariumosides I–IV suppress TNF-α production, modulating NF-κB–mediated inflammatory gene expression and contributing to the plant's anti-inflammatory profile (PMID 19336929).

Scientific Research

Valero et al. (2022) published in Antioxidants (Basel) (PMID 35739989) demonstrated that Helichrysum stoechas polyphenolic extract induced significant, dose-dependent vasorelaxation in isolated rat aortic rings via the NO/cGMP pathway, establishing its antihypertensive potential. A companion study by Valero et al. (2022) in the International Journal of Molecular Sciences (PMID 36430899) further characterized the spasmolytic mechanism, confirming involvement of Ca²⁺-activated K⁺ channels (inhibited by TRAM-34, apamin, and glibenclamide) and L-type Ca²⁺ channel blockade. Morikawa et al. (2009) in Chemical and Pharmaceutical Bulletin (PMID 19336929) isolated novel flavanone and chalcone glycosides (arenariumosides I–IV) from Helichrysum arenarium flowers and demonstrated TNF-α inhibitory activity, supporting anti-inflammatory applications. A comprehensive review by Antunes Viegas et al. (2014) in the Journal of Ethnopharmacology (PMID 24239849) systematically cataloged in vitro and preclinical evidence for H. italicum's anti-inflammatory, antimicrobial, antioxidant, and wound-healing properties, noting that human clinical trials remain limited.

Clinical Summary

Current evidence is limited to in vitro and ex vivo studies using rat aortic rings, with no human clinical trials reported. Antioxidant studies demonstrate leaf extracts inhibit MDA formation dose-dependently at 50-200 μg/mL, matching the efficacy of EGCG at 62-250 μg/mL in AAPH-oxidized red blood cell models. Isometric myography studies show vasorelaxation effects that are almost completely inhibited by combined L-NAME, TRAM-34, and apamin treatment. While traditional use for arterial hypertension is documented in the Iberian Peninsula, human clinical trials are urgently needed to establish safety, efficacy, and appropriate dosing protocols.

Nutritional Profile

- Minerals: Trace minerals
- Phytochemicals: Flavonoids, Polyphenols, Sesquiterpenes, Essential Oils (e.g., Neryl Acetate)

Preparation & Dosage

- Forms: Available as dried flowers for tea, essential oil for aromatherapy and topical application, and infused oils for skincare.
- Tea: Steep 1-2 teaspoons of dried flowers for a soothing, antioxidant-rich infusion.
- Topical: Apply a few drops of essential oil, diluted in a carrier oil (e.g., jojoba, almond), to skin for healing and anti-aging.
- Aromatherapy: Diffuse essential oil for relaxation and stress relief.

Synergy & Pairings

Role: Polyphenol/antioxidant base
Intention: Skin & Collagen | Mood & Stress
Primary Pairings: - Rosehip Oil (Rosa canina)
- Jojoba Oil (Simmondsia chinensis)
- Vitamin C (Ascorbic acid)
- Lavender (Lavandula angustifolia)

Safety & Interactions

Everlasting flower preparations are generally considered well-tolerated at traditional doses; however, species within the Helichrysum genus contain coumarin-like compounds and flavonoids that may potentiate the effects of anticoagulant and antiplatelet medications (e.g., warfarin, aspirin), warranting caution in patients on blood-thinning therapy. Because the extract acts on vascular smooth muscle via NO/cGMP pathways and Ca²⁺ channel modulation, concurrent use with antihypertensive drugs or phosphodiesterase-5 inhibitors may produce additive hypotensive effects. Although no specific CYP450 interaction studies have been published for H. stoechas, structurally related flavonoids in other Helichrysum species are known modulators of CYP3A4 and CYP1A2, suggesting the potential for pharmacokinetic interactions with substrates of these enzymes. Pregnant and breastfeeding women should avoid use due to insufficient safety data, and individuals with Asteraceae/Compositae allergies may experience hypersensitivity reactions.