Naringin is a natural plant substance that is mainly found in grapefruits and other citrus fruits. It is a flavonoid, i.e. a secondary plant substance with a wide range of health-promoting properties. This scientific review summarizes current findings on the effect of naringin on the cardiovascular system and blood vessels.
Naringin has an antioxidant, anti-inflammatory and vasoprotective effect. It supports the health of the endothelial cells – the cells that line the blood vessels from the inside and play a decisive role in blood pressure, vessel width and blood flow.
Studies show that naringin can help to lower blood lipids, regulate blood pressure and improve vascular elasticity. It can also reduce inflammation and oxidative stress, which contribute to the development of arteriosclerosis and cardiovascular disease.
Conclusion: Naringin is a naturally occurring, safe active ingredient from citrus fruits that supports vascular function and can reduce the risk of cardiovascular disease – particularly by protecting the sensitive endothelial layer. A diet with regular consumption of citrus fruits or supplements containing naringin can therefore make an important contribution to heart health.
Background
Cardiovascular diseases are the most common cause of death worldwide. The endothelium, the thin layer of cells on the inside of the blood vessel, plays a key role in their development. Its function determines vessel width, blood flow, inflammation and blood clotting. Damage to the endothelium is considered to be the starting point of arteriosclerosis.
Naringina natural flavonoid glycoside found mainly in grapefruit, pomelo and other citrus fruits, has gained attention in recent years for its numerous cardioprotective mechanisms of action. This review summarizes the current preclinical and clinical findings.
Molecular mechanisms of action
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Antioxidant effects
Naringin acts as a powerful antioxidant. It scavenges free radicals and activates the body’s own protective systems such as superoxide dismutase (SOD), catalase and glutathione peroxidase. As a result, it reduces oxidative stress, which can damage vascular cells.
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Inflammation inhibition
The active ingredient inhibits central inflammatory pathways (e.g. NF-κB, MAPK) and reduces the formation of pro-inflammatory messengers such as TNF-α, IL-1β and IL-6. These mechanisms contribute to the stabilization of the vessel walls.
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Protection of the endothelial function
Naringin promotes the formation of nitric oxide (NO) by activating eNOS (endothelial NO synthase). NO dilates the blood vessels, lowers blood pressure and improves blood circulation. At the same time, naringin inhibits endothelial dysfunction – i.e. dysregulation of the inner wall of the blood vessels, which leads to high blood pressure and arteriosclerosis.
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Lipid metabolism and prevention of arteriosclerosis
In animal models, naringin lowers total and LDL cholesterol, increases HDL, reduces triglycerides and prevents the oxidation of LDL cholesterol, a major trigger for plaque formation.
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Anti-apoptosis and cell protection
Naringin protects vascular cells from premature cell death by inhibiting apoptotic signaling pathways. This effect contributes to the regeneration and maintenance of healthy endothelial cells.
Preclinical findings
Animal and cell studies show that naringin:
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lower blood pressure,
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improve vascular function,
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protect heart muscle cells from oxidative stress and
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can significantly reduce arteriosclerosis.
In rat models, the administration of naringin led to a decrease in inflammation and lipid levels, while vascular elasticity increased.
Clinical findings
Initial human studies indicate that naringin can lower LDL and triglycerides and increase the antioxidant capacity in the blood in people with slightly elevated blood lipids or metabolic syndrome. A slight reduction in blood pressure and an improvement in vasodilatation have also been observed.
Security
In normal quantities, naringin is considered safe and well tolerated. It is a component of many everyday foods, especially grapefruit, whose juice, however, requires caution when taken with certain medications (as naringin can inhibit some liver enzymes that break down drugs).
Discussion and perspectives
The available data indicate a considerable potential of naringin for the prevention and concomitant treatment of cardiovascular diseases. The targeted effect on the endothelium, which is mediated by antioxidant and anti-inflammatory mechanisms, is particularly relevant.
Future research should focus on larger clinical trials to clarify dose recommendations, long-term effects and the role of synergistic combinations with other flavonoids (e.g. hesperidin, quercetin).
Conclusion
Naringin is a versatile herbal active ingredient with strong protective potential for the heart and blood vessels. It improves the function of the inner wall of blood vessels, reduces inflammation and oxidative stress, regulates lipid metabolism and can therefore reduce the risk of high blood pressure and arteriosclerosis. Due to its good tolerability and broad mechanisms of action, naringin is considered a promising natural supplement for promoting cardiovascular health.