NSTK · 01.2026Independent supplement reference

Edition 1.0Updated August 1, 2026

Supplement × Supplement·Evidence index

Garlic Extract and Olive Leaf Extract: what the published research says

PubMed indexes 2 records that name Garlic Extract and Olive Leaf Extract together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Studies listed

Human studies

Reviews & meta-analyses

Published

2016–2022

Read the studies ↓ How we select sources

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to Garlic Extract and Olive Leaf Extract. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

A study appearing here is not proof that an interaction exists. Two substances can be named together in a paper that never tested them in combination, and a source listed as background may cover only one of them.
Findings are quoted from each abstract as the authors wrote them. NutriStack has not re-analysed, pooled, or reconciled them, and they may disagree with each other.
NutriStack’s own interaction assessment for this pair is not published here. It has not completed qualified-human clinical review, so it is withheld from search. See the publication gate.
Nothing here is medical advice. Decisions about prescription medication and supplements belong with your prescriber or pharmacist, who can see your full regimen.

The research

2 studies naming Garlic Extract and Olive Leaf Extract.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

Effect of Allium sativum and Olea europaea on serum lipids in patients with diabetes mellitus.

Journal of Taibah University Medical Sciences · 2022 · PMID 37102080

“The antihyperlipidemic activity observed may be due to the presence of antioxidants in the test substances. Further studies should be conducted with a larger sample size in order to further evaluate the role of A. sativum powder and O. europaea oil in patients with T2DM with dyslipidemia.”
Memon et al. · Authors' conclusion

Names both Garlic Extract and Olive Leaf Extract in its title.

Effect of olive leaf, Satureja khuzestanica, and Allium sativum extracts on Giardia lamblia cysts compared with metronidazole in vitro.

Journal of parasitic diseases : official organ of the Indian Society for Parasitology · 2016 · PMID 27876915

“With respect to higher fatality effect of olive leaf and S. khuzestanica extracts compared with metronidazole in vitro, these plants can be used as suitable candidates to make new antigiardial drugs with low side effects and without drug resistance in the treatment of giardiasis in children.”
Fallahi et al. · From the abstract

Names both Garlic Extract and Olive Leaf Extract in its title.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

Selection. These records were found by searching PubMed titles and abstracts for both substance names alongside interaction and pharmacokinetic terms. Relevant work that phrases things differently, or is not indexed in PubMed, will be missing.
No effect size. The quoted conclusions are the authors’ words about their own study. We have not extracted effect direction or magnitude, and a single study’s conclusion is not a consensus.
Population mismatch. Findings in healthy volunteers, animals, or a specific patient group may not transfer to you, your dose, or your formulation.
Absence is not safety. Few published studies means the combination is under-studied, which is not the same as established as safe.

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Garlic Extract, Olive Leaf Extract, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

Get NutriStack free → Read the methodology

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.