Hydroxytyrosol (Phenylethanol · EFSA-Approved · Cardiovascular · Antioxidant)

Compound	Hydroxytyrosol
Chemical class	Polyphenol — Phenylethanol (3,4-Dihydroxyphenethanol)
CAS	10597-60-1
Primary source	Olea europaea (olive leaf, virgin olive oil, olive mill wastewater)
Key applications	Cardiovascular, antioxidant, Mediterranean diet bioactive, neuroprotective
Claim strength	Moderate
Typical form	Olive leaf extract (oleuropein + hydroxytyrosol); hydroxytyrosol isolate
Buy from Herbuno	Olive Leaf Extract Powder → Olive Leaf Liquid Extract (Water Soluble) - Olea europaea →

Name origin: From hydroxy (hydroxyl group) + tyrosol (the parent monohydroxy compound from tyrosine) — reflecting its structure as tyrosol with an additional catechol hydroxyl. Hydroxytyrosol is the primary phenylethanol in olive and is also formed in vivo by hydrolysis of oleuropein (the major secoiridoid glycoside in olive leaf). Traditional use: Olive preparations have been central to Mediterranean culture and medicine for millennia. Olive leaf infusions have been used in Mediterranean folk medicine for hypertension, fever, and antimicrobial applications. Hydroxytyrosol is now understood to be a primary contributor to these properties, alongside oleuropein and oleocanthal. Research trajectory: Hydroxytyrosol has EFSA-approved health claim status — one of the few botanical polyphenols with an EU-approved claim (“olive polyphenols contribute to the protection of blood lipids from oxidative stress” — condition: 5 mg hydroxytyrosol and its derivatives per day). This regulatory status distinguishes it from most botanical actives. Commercial source: Commercially available via olive leaf extract standardised to oleuropein and hydroxytyrosol, and as isolated hydroxytyrosol from olive processing by-products (olive mill wastewater). See sourcing options below.

---

Evidence for Hydroxytyrosol Applications

Lipid oxidation protection (EFSA-approved): Multiple human RCTs demonstrate olive oil polyphenols (hydroxytyrosol and its derivatives including oleuropein and tyrosol) at 5 mg/day significantly reduce LDL oxidation markers (conjugated dienes, TBARS). This formed the basis of EFSA Health Claim 1:1 for olive polyphenols. The protective effect is on oxidised LDL — a validated cardiovascular risk marker. Claim strength: High (EFSA-approved claim condition).

Cardiovascular and endothelial function: Beyond LDL oxidation, hydroxytyrosol reduces platelet aggregation, improves endothelial function (FMD), and activates eNOS in human supplementation studies. Mediterranean diet RCTs (PREDIMED study) attributed cardiovascular mortality reduction partly to olive polyphenol intake. Claim strength: Moderate.

Neuroprotective and mitochondrial: Hydroxytyrosol crosses the blood-brain barrier, activates Nrf2/SIRT1, and reduces neuroinflammation in animal models. It is one of the few polyphenols with documented mitochondrial protection via PGC-1α activation — relevant to neuroprotection and longevity formulations. Claim strength: Moderate.

---

Dosage & Formulator Specification

EFSA claim condition: 5 mg/day hydroxytyrosol and its derivatives (as olive polyphenols) for LDL oxidation protection. This is the minimum dose for claim use. For broader cardiovascular and antioxidant positioning, 10–30 mg/day hydroxytyrosol equivalent is a working range based on human supplementation studies.

Specification note: EFSA’s claim refers to “hydroxytyrosol and its derivatives” which includes oleuropein (which generates hydroxytyrosol on hydrolysis), elenolic acid, and related secoiridoids in olive. Olive leaf extract standardised to oleuropein (20–40%) co-delivers hydroxytyrosol and its precursor forms at levels meeting the EFSA claim condition. Specify olive leaf extract by both oleuropein and hydroxytyrosol content (HPLC) for EFSA claim compliance.

Hydroxytyrosol has excellent water solubility, very high oral bioavailability (~60–70% in human studies — one of the highest among polyphenols), and crosses multiple biological barriers including the BBB. No bioavailability enhancement is required at effective supplement doses. Sensitive to oxidation (catechol structure) — antioxidant co-formulation and nitrogen packaging strongly recommended.

---

Frequently Asked Questions — Hydroxytyrosol

What is the EFSA health claim for hydroxytyrosol and how do I use it on a supplement label?
EFSA approved Claim ID 1:1: “Olive oil polyphenols contribute to the protection of blood lipids from oxidative stress.” Conditions: (1) minimum 5 mg hydroxytyrosol and its derivatives per daily serving; (2) the claim may only be used for olive oil or olive preparations containing at least 5 mg hydroxytyrosol and its derivatives per 20 g olive oil. For supplement labels, claim is typically worded as “Olive polyphenols help protect blood lipids from oxidative damage” with a dose disclosure confirming ⁉5 mg hydroxytyrosol equivalents. Legal and regulatory review in your specific market is required before label use.

Is olive leaf extract the same as extra virgin olive oil for hydroxytyrosol content?
No — though both contain hydroxytyrosol and its derivatives. Extra virgin olive oil contains oleuropein and hydroxytyrosol at approximately 5–30 mg/kg total polyphenols — providing 0.1–0.6 mg hydroxytyrosol per 20 g serving. Olive leaf extract is far more concentrated: standardised to 20–40% oleuropein, delivering significantly more hydroxytyrosol equivalent per gram. For supplement applications, olive leaf extract is the practical concentrated source.

What is the relationship between oleuropein and hydroxytyrosol?
Oleuropein is the secoiridoid glycoside parent compound; hydroxytyrosol is released from oleuropein by hydrolysis of the ester bond (enzymatic in the plant during processing, or acid/enzymatic in the gut). Both are bioactive independently: oleuropein has potent antioxidant and antimicrobial activity; hydroxytyrosol has superior bioavailability and CNS penetration. Olive leaf extract delivers both in natural proportions.

Can hydroxytyrosol be positioned for sports and exercise applications?
Emerging evidence supports hydroxytyrosol for exercise-related applications: it reduces exercise-induced oxidative stress, improves mitochondrial biogenesis (via PGC-1α), and reduces post-exercise inflammatory markers in pilot studies. This positions it in the active lifestyle/sports recovery segment alongside established ingredients like tart cherry and curcumin. The EFSA claim provides an additional regulatory anchor for the cardiovascular protective dimension of an active lifestyle product.

---

Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

← HerbIQ Compound Index · HerbIQ P02: Extraction · HerbIQ P03: Delivery