What Does the Evidence Show?
Herbal medicines and nutraceuticals can be appealing when we want to support cardiovascular health naturally. Many plants contain compounds that affect blood pressure, lipid metabolism, inflammation and oxidative stress. However, an important distinction is often missed: a substance that changes a laboratory marker is not necessarily proven to prevent a heart attack or stroke.
In naturopathic care, these products are best viewed as targeted additions to food and lifestyle changes, chosen according to individual risk factors, other health conditions and possible interactions.
Herbal medicines with cardiovascular potential
Garlic (Allium sativum) contains organosulfur compounds investigated for effects on vascular tone and lipid metabolism. Studies of standardised aged garlic extracts suggest modest reductions in blood pressure in some adults, particularly those with higher baseline readings. Effects vary by preparation; eating garlic is not equivalent to taking a concentrated extract.
Hibiscus (Hibiscus sabdariffa) contains anthocyanins and other polyphenols. Human studies suggest hibiscus tea or extracts may lower blood pressure modestly. It can be a useful dietary addition for some people, but anyone prone to low blood pressure or taking blood-pressure-lowering treatments needs appropriate guidance.
Hawthorn (Crataegus species) is traditionally used in Western herbal medicine for cardiovascular support. Its flavonoids and procyanidins are of scientific interest, yet robust evidence for preventing major cardiovascular events is lacking. It is not suitable for self-treatment of chest pain, heart failure or an irregular heartbeat.
Turmeric (Curcuma longa) provides curcuminoids studied for effects on inflammatory pathways and metabolic markers. Culinary turmeric contributes flavour and plant diversity, but concentrated curcumin products have variable absorption and are not proven cardiovascular event-prevention therapies.
A broad review by Netala and colleagues, published in Cells in 2024, describes potentially cardioprotective plant compounds while emphasising their complementary rather than established disease-treating role.
Nutraceuticals
A nutraceutical may be useful when there is a clearly identified target. The strongest rationale is generally for an intervention with measurable benefits and a suitable safety profile.
Partially hydrolysed guar gum (PHGG) is a soluble, fermentable dietary fibre that may support cardiovascular health by improving lipid metabolism and reducing intestinal cholesterol absorption. Laboratory research demonstrated that cholesterol bioaccessibility decreased from approximately 82% without PHGG to 75% with 3% PHGG and 64% with 6% PHGG, suggesting potential cholesterol-lowering benefits.
Psyllium husk is a soluble fibre supplement that can lower LDL cholesterol through effects on bile acid metabolism. Approximately 10 grams daily has been studied in clinical trials, although individual needs vary. It should be taken with adequate water and separated from certain medicines when advised.
Omega-3 EPA and DHA may be considered when triglycerides are elevated. The effect depends on dose and formulation. Standard fish-oil supplements should not be presented as interchangeable with treatments shown to reduce events in selected high-risk populations. High doses require professional supervision, particularly with an irregular heartbeat or bleeding risk.
Lycopene, found in tomatoes, is being investigated for vascular and antioxidant effects. A review by Bin-Jumah and colleagues discusses potential benefits for blood pressure and lipid pathways, but clinical evidence remains mixed. Tomato-based foods remain a sensible first step before considering supplementation.
Product quality and safety matter
Two products made from the same plant may contain very different amounts of active compounds. Standardisation and manufacturing quality matter. Evidence for one specific extract cannot automatically apply to every tea, tincture or capsule.
What about the newest plant research?
A 2026 review by Liu and colleagues describes plant-derived exosome-like nanoparticles: tiny vesicles isolated from plants such as ginger, garlic, grapes and citrus. They contain lipids, proteins and other molecules that may participate in cellular communication.
Laboratory and animal research suggests intriguing anti-inflammatory and metabolic effects. However, human cardiovascular studies are almost absent. There is currently insufficient evidence to recommend nanoparticle products for heart disease prevention or treatment.
A personalised approach is safer and more effective
Before recommending a supplement, a practitioner should ask what problem it is intended to address, whether there is credible human evidence, and how progress will be measured. Blood pressure trends, lipid tests, glucose markers and adverse effects may all be relevant.
“Natural” does not mean risk-free. Concentrated botanicals can interact with medicines, affect blood pressure or blood clotting, and vary considerably between products. Existing cardiovascular symptoms always deserve appropriate medical investigation.
Ultimately, the most dependable foundations for heart health remain nutritious food, movement, sleep, tobacco avoidance and regular risk assessment. Carefully chosen herbal medicines and nutraceuticals may complement these strategies, but more is not necessarily better.
Missed the other blogs in our Cardiovascular Health Series?
Catch up on our previous articles here:
- Part 1: Naturopathic look at Cardiovascular Health
- Part 2: Diet and Lifestyle for Cardiovascular Health
Discover how naturopathic care, nutrition and everyday lifestyle choices can work together to support long-term heart health.
References
Bin-Jumah, M. N., et al. (2022). Lycopene: A Natural Arsenal in the War against Oxidative Stress and Cardiovascular Diseases. Antioxidants, 11(2), 232. https://doi.org/10.3390/antiox11020232
Blake, D. E., Hamblett, C. J., Frost, P. G., Judd, P. A., & Ellis, P. R. (1997). Wheat bread supplemented with depolymerized guar gum reduces the plasma cholesterol concentration in hypercholesterolemic human subjects. American Journal of Clinical Nutrition, 65(1), 107–113. https://doi.org/10.1093/ajcn/65.1.107
Liu, W., et al. (2026). Plant-Derived Exosome-Like Nanoparticles: Mechanisms of Cross-Kingdom Regulation and Perspectives as Natural Drug Carriers for Disease Treatment. International Journal of Nanomedicine. https://doi.org/10.2147/IJN.S581774
Michalopoulou, E., et al. (2025). The Triad of Risk: Linking MASLD, Cardiovascular Disease and Type 2 Diabetes; From Pathophysiology to Treatment. Journal of Clinical Medicine, 14(2), 428. https://doi.org/10.3390/jcm14020428
Minekus, M., Jelier, M., Xiao, J.-Z., Kondo, S., Iwatsuki, K., Kokubo, S., Bos, M., Dunnewind, B., & Havenaar, R. (2005). Effect of partially hydrolyzed guar gum (PHGG) on the bioaccessibility of fat and cholesterol. Bioscience, Biotechnology, and Biochemistry, 69(5), 932–938. https://doi.org/10.1271/bbb.69.932
Mohamed, S. M., et al. (2023). Metabolic syndrome: risk factors, diagnosis, pathogenesis, and management with natural approaches. Food Chemistry Advances, 3, 100335. https://doi.org/10.1016/j.focha.2023.100335
Netala, V. R., et al. (2024). A Comprehensive Review of Cardiovascular Disease Management: Cardiac Biomarkers, Imaging Modalities, Pharmacotherapy, Surgical Interventions, and Herbal Remedies. Cells, 13(17), 1471. https://doi.org/10.3390/cells13171471
Additional supporting evidence and clinical resources
Australian Cardiovascular Disease Risk Guideline (2023). https://www.cvdcheck.org.au
The Effect of Aged Garlic Supplementation on Blood Pressure and Lipid Profile: A Systematic Review and Meta-Analysis of Randomized Controlled Trials (2025). https://pubmed.ncbi.nlm.nih.gov/40628369/
Effect of Psyllium Fiber on LDL Cholesterol, Non-HDL Cholesterol and Apolipoprotein B: A Systematic Review and Meta-Analysis. https://pubmed.ncbi.nlm.nih.gov/30239559/
Efficacy and Safety of Hibiscus sabdariffa in Cardiometabolic Health: An Overview of Reviews and Updated Dose-Response Meta-Analysis (2025). https://pubmed.ncbi.nlm.nih.gov/39870328/
National Heart Foundation of Australia. Heart Healthy Eating Pattern. https://www.heartfoundation.org.au
Role of Lycopene from Tomato on Cardiovascular Risk: An Umbrella Review of Systematic Reviews and Meta-Analyses of Intervention Studies (2026). https://pubmed.ncbi.nlm.nih.gov/41369612/
Disclaimer
This article is provided for general health education and does not replace individual medical advice, cardiovascular risk assessment or treatment. Herbal medicines and nutritional supplements should be selected with appropriate professional guidance, particularly in people with existing cardiovascular disease or other medical conditions.
