Naringenin: possible effects on the heart, liver, insulin and immune system
Naringenin – a flavonoid found in citrus peel. Discover its effects on the heart, liver, insulin, inflammation and immune system, with scientific backing and as part of a natural diet.
- What is naringenin?
- How naringenin affects the body
- Use, dosage and bioavailability
- Side effects & precautions
- Buying naringenin: what to look for
- FAQ about Naringenin
1. What is naringenin?
Naringenin is a naturally occurring flavonoid in the flavanone group.
It is found mainly in citrus fruits such as grapefruits, bitter oranges and lemons – in particularly high concentrations in the peel.
Naringenin is considered one of the most effective plant compounds for supporting the liver, cardiovascular system and immune function, as well as metabolic health.
In natural medicine and research, it is valued for the following properties:
- Antioxidant – protects cells from free radicals
- anti-inflammatory – modulates immune reactions
- protects the liver and blood vessels – supports detoxification and circulation
- promotes insulin sensitivity – regulates blood sugar
1.1 Natural sources & foods
The best sources of naringenin are citrus peel and unprocessed citrus fruit parts, especially:
- Bitter orange peel
- Grapefruit peel – highest concentration
- Lemon peel and lime peel
- Orange peel tea made from permaculture-grown oranges
Fruit juice alone contains much less of this valuable plant compound, because, like hesperidin, it is found mainly in the white layers of the peel (mesocarp).
1.2 Mechanism of action in the body
In the body, naringenin exerts its effects through several biological mechanisms:
- Activation of antioxidant enzyme systems (e.g. superoxide dismutase)
- Reduction of inflammatory signalling substances (e.g. TNF-α, IL-6)
- Protection of mitochondria and stabilisation of cell membranes
- Improving insulin sensitivity by influencing glucose metabolism
This broad range of effects makes naringenin a promising compound in prevention, functional nutrition and natural medicine.
2. Effects of naringenin on the body
The flavonoid’s effects on health have been investigated in numerous studies.
As a multifunctional flavonoid, it has effects on the cardiovascular system, fat and sugar metabolism, liver health and the immune system.
Its mode of action is based on anti-inflammatory, antioxidant and cell-protective mechanisms.
2.1 Heart and blood vessels: flavonoids offer protection
Naringenin improves vascular elasticity, protects the endothelial cells (the inner lining of blood vessels) and has a cholesterol-lowering effect. It inhibits the oxidation of LDL cholesterol – a key factor in atherosclerosis – and may therefore reduce the risk of heart attack and stroke.
In combination with other flavonoids such as hesperidin or rutin, the vascular protective effect is significantly increased.
2.2 Liver function & fatty liver prevention
Naringenin is considered one of the most effective hepatoprotective flavonoids. It protects liver cells from fat accumulation, oxidative stress and inflammation.
Studies show improved liver function with naringenin intake, particularly in patients with non-alcoholic fatty liver disease (NAFLD).
In addition, it regulates enzymes such as ALT and AST and supports detoxification via phase II liver enzymes.
2.3 Effects of naringenin on insulin, blood sugar and metabolic syndrome
Naringenin improves insulin sensitivity – the ability of the body’s cells to respond to insulin. It lowers
Especially in combination with polyphenols such as quercetin or catechins (e.g. from matcha), naringenin shows synergistic effects in the fight against metabolic syndrome.
2.4 Immune system & anti-inflammatory effects
As a potent antioxidant, it reduces the formation of free radicals and lowers inflammatory markers such as TNF-α, IL-6 and CRP. It stabilises immune cells and protects their mitochondria from oxidative stress.
Studies show that naringenin may also play a role in preventive immune support, for example in cases of recurring infections, autoimmune reactions or chronic inflammation.
It is therefore considered one of the most promising natural substances for a holistic approach to immune health.
3. Use, dosage and bioavailability
The health effects of naringenin depend not only on its biochemical activity, but also on how, when and in what form it is consumed. Bioavailability and synergies with other plant compounds also play a crucial role.
3.1 Food or supplements
Natural intake of naringenin comes from:
- Citrus peels (especially bitter orange, grapefruit, lemon)
- Orange peel tea made from permaculture-grown oranges
- Fruit pieces, jams or fermented citrus products
In juice or pulp, the flavonoid is scarcely present, as it is stored mainly in the peel.
For specific health effects (for example, liver or vascular problems), high-dose supplements may also be useful. Choose standardised extracts.
3.2 Suggested amounts and combinations
Studies have used doses of 100–600 mg per day, depending on the aim. Supplements commonly provide 200–500 mg per day, a dose generally considered well tolerated.
Synergistic combinations:
- Hesperidin – to support vascular and nerve functions (orange tea)
- Quercetin – for anti-inflammatory, antiviral and antioxidant effects (lemongrass tea)
- Catechins – e.g. from green tea or matcha
- Vitamin C – improves absorption and stabilises flavonoids (hibiscus tea)
Tip: Naringenin is slightly soluble in fat, so taking it with a fat-containing meal may significantly improve its bioavailability.
4. Side effects & precautions
Naringenin is considered very well tolerated at usual doses obtained through food. As with many bioactive plant compounds, however, the side-effect profile depends on the dose, duration of use and individual sensitivity.
In rare cases, taking high-dose supplements (> 500 mg per day) may cause the following side effects:
- mild digestive problems (especially flatulence and diarrhoea)
- Headache or fatigue
- Hypersensitivity reactions in citrus allergy
Drug interactions
Naringenin can inhibit certain liver enzymes, as grapefruit can, and may thereby affect how medicines work.
Caution is advised when taking:
- Statins (cholesterol-lowering drugs)
- Blood pressure medications (e.g. calcium channel blockers)
- Immunosuppressants (e.g. ciclosporin)
- Antidepressants or antiepileptics
Recommendation: If you regularly take prescription medicines, any additional intake of the flavonoid, particularly as a supplement, should be discussed with your doctor beforehand.
However, no adverse effects are expected when naringenin from orange peel is consumed as part of a natural diet.
5. Buying naringenin: what to look for
If you want to use this valuable plant compound specifically as a supplement, look for quality, purity and origin. Many products contain blends or low-quality extracts with low bioavailability.
Buying checklist:
- Standardised content: Look for a clear statement of the naringenin content (e.g. 98% pure or 200 mg per capsule).
- Free from additives: no artificial colours or flavours, or magnesium stearate.
- GMP/ISO-certified manufacturing: guarantees pharmaceutical quality.
- Optimised bioavailability: for example, through citrus bioflavonoids, phospholipids or liposomal encapsulation.
Natural alternative: If you prefer whole-plant ingredients, you can also obtain naringenin from permaculture-grown orange peel tea. Here, naringenin occurs in its naturally bound form and works synergistically with other flavonoids such as hesperidin, making it particularly bioactive.
This form is ideal for
6. Frequently asked questions about naringenin
Here you’ll find answers to frequently asked questions about naringenin, its effects and uses. You can also read more about related flavonoids in our article about hesperidin.
❓ What is naringenin and where is it found?
Naringenin is a flavonoid found in citrus peel, especially grapefruit, bitter orange and lemon. Orange peel tea contains particularly high levels.
❓ Can naringenin help with weight loss?
Indirectly, yes. Naringenin supports fat metabolism, lowers blood sugar and improves insulin sensitivity; these effects may be particularly strong when combined with quercetin or catechins.
❓ Is naringenin heat stable?
Yes. Naringenin remains present when orange peel tea is brewed. A steeping time of 5–10 minutes is suitable; avoid extreme heat or prolonged boiling.
❓ Can you overdose on naringenin?
Overdosing through food is unlikely. If taking high-dose supplements above 600 mg per day, seek medical advice, particularly if you take medication.
❓ Which is better: hesperidin or naringenin?
They have different effects but complement each other well. Hesperidin has a stronger effect on blood vessels and the brain, while naringenin affects the liver, insulin and inflammation. One option is to combine them, for example in orange peel tea.
❓ Does naringenin work like insulin?
Naringenin does not act like insulin itself, but it may enhance insulin’s effects in the body. It improves cellular insulin sensitivity, lowers blood sugar and reduces inflammation, which is often associated with insulin resistance. It may be relevant to prediabetes or metabolic syndrome.