Rosemary (Rosmarinus officinalis / Salvia rosmarinus)

Rosemary (Rosmarinus officinalis, recently reclassified as Salvia rosmarinus) is a culinary and medicinal herb of the Lamiaceae (mint) family, native to the Mediterranean. The leaf contains rosmarinic acid, carnosic acid, carnosol, ursolic acid, and an essential-oil fraction. Rosemary is most commonly used as a culinary herb and as a food-grade antioxidant (E392, declared on food labels). In supplements it is positioned for antioxidant and cognitive-function support, but trial evidence is small and no UK Article 13.1 health claim is authorised. As a low-dose adjunct in a menopause blend, rosemary contributes mostly antioxidant rosmarinic acid; the dose is too low for most claimed cognitive effects.

Camden Medicals editorial · Last reviewed 2 May 2026 · Next review May 2027

  • Cross-checked against
  • NHS
  • NICE
  • BNF
  • EFSA
  • FSA
Verifera Evidence ReviewCamden evidence review · independently appraised — graded, not guessed.

Camden's editorial team independently graded each health claim below on the strength of the published evidence — see the grade beside every condition.

Class
Botanical
Typical daily dose
No UK consensus dose. Cognitive-research trials have used 750–1,500 mg dried leaf or equivalent extract / day. Antioxidant-marker trials use 200–500 mg of leaf extract standardised to 5–7 % rosmarinic acid. Below 100 mg/day is generally a token-dose adjunct.
Top use evidence
Limited
On this page
  1. What it is
  2. How it works

What it is

Rosemary is a perennial woody evergreen herb. The needle-shaped leaves are the medicinal part. The taxonomic reclassification in 2017 placed Rosmarinus officinalis within the Salvia genus as Salvia rosmarinus — both names appear in current literature and on labels.
The leaf contains rosmarinic acid (the most-cited phenolic-acid marker, also found in sage and other Lamiaceae), carnosic acid, carnosol, ursolic acid, and an essential-oil fraction (1,8-cineole, α-pinene, camphor, borneol). The food-grade rosemary extract used as a food antioxidant (E392) is concentrated for carnosic acid + carnosol; supplement-grade rosemary leaf extract is typically standardised for rosmarinic acid.
The multi-active menopause blend Camden is evaluating declares rosemary leaf extract at 50 mg per 2-capsule serving providing 2.5 % rosmarinic acid — i.e. 1.25 mg rosmarinic acid per serving. That is approximately what a teaspoon of fresh rosemary delivers. As a clinical-evidence-led active, this is below any meaningful dose; as a brand-front-of-pack "with rosemary" mention, it is present.

At a glance

  • Mediterranean culinary / medicinal herb. Lamiaceae family — same family as sage.
  • No UK-authorised health claim. Pending cognitive and antioxidant claims sit on EFSA hold.
  • Best-known supplement marker is rosmarinic acid (a phenolic acid) — typically standardised at 2–6 % in extract.
  • In a menopause blend at 50 mg, rosemary is a token antioxidant adjunct, not a clinical-evidence-led active.
  • Generally well tolerated; avoid concentrated doses in pregnancy. Essential oil should not be taken internally except under specialist guidance.

What people use it for

  • Adults wanting an antioxidant herb adjunct

    Rosemary contributes rosmarinic acid + carnosol antioxidants; no UK-authorised antioxidant claim ("rich in antioxidants" is a food-ingredient descriptor, not an authorised health claim). Polyphenol-rich diet remains the foundation; supplemental rosemary at typical doses is a minor adjunct.

    Some evidenceLimited

  • Adults wanting cognitive-function support

    Older small trials report acute cognitive effects with rosemary extract or aroma. Effect sizes are modest and not consistently replicated. Not relevant to clinically significant cognitive impairment.

    Some evidenceLimited

  • People with hot flushes or menopausal symptoms (in a multi-active blend)

    No standalone evidence for menopausal-symptom benefit. Rosemary as a low-dose component of a multi-active menopause blend contributes a small antioxidant fraction; the menopause-relevant active is elsewhere in the blend (sage, soy isoflavones, hops).

    Popular, not provenInsufficient

How it works

Rosmarinic acid and carnosol have antioxidant activity in laboratory assays via free-radical scavenging and Nrf2 pathway induction. Acetylcholinesterase inhibition has been reported in some preparations and is the mechanistic rationale for the historic cognitive-function research (older small trials of rosemary aroma or oral extract reported acute effects on memory and mood). Clinical translation of any single mechanism is incompletely characterised; the trial evidence is dose- and preparation-specific.

Common myths

Myth"Rosemary is a memory herb (Shakespeare-grade evidence)."

RealityThe Hamlet line ("There''s rosemary, that''s for remembrance") is folk-tradition, not clinical evidence. Modern small trials report modest acute cognitive effects in healthy adults at doses higher than the typical food intake; the effect sizes are small and not relevant to clinically significant cognitive impairment.

Myth"Rosemary essential oil internally is the same as leaf extract."

RealityDifferent preparations with different safety profiles. Essential oil is concentrated and should not be taken internally except under specialist guidance — internal toxicity case reports exist at high doses.

Common online questions

Synthesised from the questions UK shoppers most often ask online about Rosemary (Rosmarinus officinalis / Salvia rosmarinus). Each answer is editorial and links to its evidence in the Sources list below.

Is the 50 mg of rosemary in a menopause blend doing anything?

At 50 mg of leaf extract providing roughly 1.25 mg rosmarinic acid per serving, the answer is: a small antioxidant contribution, similar to a teaspoon of fresh rosemary in cooking. It is not a clinical-evidence-led dose. The menopause-relevant actives in such blends are typically sage, soy isoflavones, or hops — rosemary is an adjunct.

Can I take rosemary if I'm on warfarin?

Talk to your anticoagulation team. At food-supplement doses rosemary is not strongly implicated in INR shifts; concentrated extracts at high doses theoretically affect platelet function. Consistent inputs matter for warfarin more than absolute amounts.

Is rosemary safe in pregnancy?

Culinary use is fine. Concentrated supplemental extracts and essential oil should be avoided — historic emmenagogue (menstruation-stimulating) and uterine-stimulating use is documented for rosemary essential oil at high doses. [4]

🔬 Camden’s evidence review

The research Camden reviewed, graded on its strength. This is our own appraisal — it sits beneath the official guidance above, never above it.

  1. Cognitive function (acute) in healthy adults

    LimitedEvidencelimited

    Older small trials of rosemary aroma (Moss 2003) or oral extract reported small acute effects on memory and mood. Effect sizes modest; chronic-dose evidence weaker; not relevant to clinically significant cognitive impairment.

  2. Antioxidant / oxidative-stress markers

    LimitedEvidencelimited

    Laboratory and small clinical studies report antioxidant marker changes with rosemary extract. No UK-authorised antioxidant health claim.

  3. Hair growth (topical)

    LimitedEvidencelimited

    A 2015 trial (Panahi) reported rosemary essential oil topically equivalent to 2 % minoxidil for androgenetic alopecia over 6 months. Topical use, not relevant to a food-supplement use case. [5]

Safety

Rosemary leaf extract at typical food-supplement doses is generally well tolerated. Concentrated essential oil should not be taken internally. Avoid concentrated supplemental extracts in pregnancy.

Talk to your pharmacist or GP first if you:

  • You are pregnant or breastfeeding — avoid concentrated extracts.
  • You have epilepsy — high-dose rosemary essential oil is associated with seizures; leaf extract at typical supplement doses is generally fine.
  • You take warfarin — flag use to your anticoagulation team.
  • You have known Lamiaceae (mint family) allergy.

Common side effects: Generally well tolerated at typical food-supplement doses. Allergic reactions in Lamiaceae-allergic individuals.

Pregnancy and breastfeeding

Culinary use fine. Concentrated supplemental extracts and essential oil: avoid.

Culinary use fine. Concentrated extracts: limited data; avoid.

Talk to your GP, midwife, or pharmacist before starting any supplement during pregnancy or breastfeeding.

More clinical detail (for clinicians and informed readers)

Contraindications

  • Pregnancy (concentrated extracts).
  • Active epilepsy with concentrated essential-oil exposure.
  • Known Lamiaceae allergy.

Drug interactions

  • Warfarin — theoretical platelet effect at high doses; clinical significance not established at food-supplement doses.
  • Antihypertensives — theoretical additive effect at high doses.
  • Iron supplements — rosemary may modestly reduce non-haem iron absorption when taken concurrently.

This is not an exhaustive list. Always tell your prescriber and pharmacist about every supplement you take.

Common side effects

  • Generally well tolerated at typical food-supplement doses.

Rare side effects

  • Allergic reactions in Lamiaceae-family-allergic individuals.
  • Photodermatitis — rare reports at high topical exposure.
  • Seizures — case reports associated with rosemary essential oil at high oral doses.

How to take it

Typical supplemental range
No UK consensus dose. Cognitive-research trials have used 750–1,500 mg dried leaf or equivalent extract / day. Antioxidant-marker trials use 200–500 mg of leaf extract standardised to 5–7 % rosmarinic acid. Below 100 mg/day is generally a token-dose adjunct.
Timing
No specific timing requirement.

How to spot quality

Look for

  • Rosmarinus officinalis or Salvia rosmarinus named (the recent taxonomy update — both names current).
  • Leaf extract specified — not essential oil for internal use.
  • Rosmarinic acid percentage stated.
  • GMP-certified manufacture.

Red flags

  • Generic "rosemary extract" with no marker disclosed.
  • Essential oil sold for internal use without specialist supervision.
  • Marketing implies treatment of cognitive impairment / dementia.

Commonly combined with

Other ingredients that share a biological pathway, cofactor relationship, or evidence-backed protocol with this one. Mechanisms below cite primary physiology — not folk pairing. Doses are literature ranges, not recommendations. Talk to your pharmacist or GP before changing your stack, especially if you take prescription medication.

Turmeric (Curcuma longa)

Limited evidence

Polyphenol antioxidant cluster — rosemary + turmeric NF-κB / Nrf2 modulation overlap.

Rosemary carnosic acid + carnosol; turmeric curcumin. Both modulate NF-κB / Nrf2. Mechanism complementary in spice / antioxidant cluster.

Evidence: Polyphenol cluster framing.

Doses studied: Culinary intake; supplement-tier rosemary extract 200-400 mg + turmeric 500-1000 mg daily.

Lemon Balm (Melissa officinalis)

Limited evidence

Lamiaceae-family pair — both contain rosmarinic acid + share herbal-tea-tier consumption.

Both Lamiaceae family with rosmarinic acid as principal polyphenol. Lemon balm has broader trial body in calm / stress; rosemary in cognitive / antioxidant.

Evidence: Lamiaceae cluster.

Doses studied: Culinary intake; Camden lemon-balm covers cluster.

Related ingredients

Verifera™ is published by Camden Medicals — a UK supplement retailer. We have a commercial interest in some of the ingredients described here; we declare it on every page and our editorial process forbids adjusting copy to favour our own products. Read our editorial policy.

This page is information, not medical advice. Talk to your pharmacist or GP before starting any supplement, especially if you take prescribed medicines, are pregnant or breastfeeding, or have an existing condition.

Suspected side effects can be reported to the MHRA via the Yellow Card scheme: yellowcard.mhra.gov.uk