6 Healthiest Citrus Fruits for a Natural Immunity Boost

The healthiest citrus fruits offer a zesty flavor and a range of nutrients. You’ll find fiber, antioxidants, vitamins and minerals in these colorful fruits, which support heart, skin and immune health.

Oranges are a complete nutritional source in the citrus family. Here is an overview of what the fruit provides:

• A daily dose of vitamin C: A medium orange provides about 83 milligrams of vitamin C. The recommended daily intake of vitamin C for women is 75 milligrams and for men it is 90 milligrams. Vitamin C is an antioxidant that your body needs to produce collagen, repair skin, and build blood vessels and other tissues. It also supports your immune system, allowing you to fight infections and protect your cells from damage.
• Other protective antioxidants: Oranges contain other powerful antioxidants, such as carotenoids like beta-cryptoxanthin that give the fruit its vibrant color. You’ll also get hesperidin, an antioxidant linked to lowering blood pressure and reducing inflammation. This combination of protective compounds makes oranges particularly beneficial for heart health.
• Potassium good for the heart: One orange contains about 237 milligrams of potassium. This nutrient helps regulate your heart rate and promotes healthy muscle function. Men need 3,400 milligrams of potassium each day, while women need 2,600 milligrams. Pregnant people need 2,900 milligrams per day.
• Healthy intestinal fiber: A medium orange contains about 2.8 grams of fiber. This represents about 10% of your daily fiber needs, or 25 grams for women and 38 grams for men. Fiber keeps your digestion stable and helps you stay full after eating. Diets high in fiber are associated with a lower risk of heart disease by improving cholesterol levels and promoting blood sugar control.

Opt for whole oranges rather than juice whenever possible, as the juicing process removes beneficial fiber. That’s why dietary guidelines recommend that at least half of your daily fruit intake come from whole fruits.

Grapefruit is one of the lowest-calorie citrus fruits, but it still offers impressive nutritional value. Here are some highlights:

• Vitamin C which strengthens the immune system: Like oranges, grapefruits are rich in vitamin C. A serving of half a grapefruit contains 39 milligrams of vitamin C, about half of your daily needs.
• Lycopene good for the heart: Pink and red grapefruits are distinguished from other citrus fruits by their high content of lycopene, a powerful antioxidant that gives the fruit its pink or red color. Lycopene has been studied for its potential to support heart health and reduce inflammation. One cup of red or pink grapefruit segments contains as much lycopene as a medium tomato.
• Protective vitamin A: Grapefruits also provide beta-carotene, which your body converts into vitamin A. This nutrient supports healthy eyes, immune function, and skin. The combination of lycopene and beta-carotene makes pink and red grapefruit particularly rich in protective compounds.
• Soluble fiber in the form of pectin: You will also find pectin in grapefruit. This soluble fiber is found in the membranes of the fruit. Research suggests that pectin may help reduce LDL (bad) cholesterol levels. Eating grapefruit in sections, rather than just removing the flesh, allows you to get more of these beneficial membranes.

Grapefruit may interact with certain medications. These include certain cholesterol-lowering statins, blood pressure medications, and antihistamines. If you are taking prescription medications, consult your doctor or pharmacist before adding grapefruit to your diet. They may be able to adjust the timing of your treatment or suggest alternatives that don’t interact with grapefruit.

You’re unlikely to eat a whole lemon, but its juice and zest have great nutritional value. Here’s how they support health:

• Citric Acid for Kidney Health: Lemons are notable for their exceptionally high citric acid content. Lemon juice contains about five times more citric acid than orange juice. This compound acts as a natural defense against kidney stones. Kidney stones often form when waste products, such as calcium, crystallize in the urine. Citric acid binds to calcium, preventing these crystals from turning into stones. Increasing urinary citrate through diet is an effective way to prevent stones from returning.
• Antioxidant power of eriocitrine: Lemons are rich in the flavonoid eriocitrine which acts as a powerful antioxidant. It helps reduce inflammation, supports immune function, and may help prevent chronic disease by reducing oxidative stress. Research also shows that it may have anti-cancer, anti-obesity and neuroprotective properties.

Tangerines, including clementines and tangerines, are smaller, sweeter, and easier to peel than regular oranges. These citrus fruits are a good source of:

• Vitamin C: One medium tangerine provides about 24 milligrams of vitamin C, or about a third of your daily needs.
• Vitamin A via beta-cryptoxanthin: Tangerines are very high in beta-cryptoxanthin, a carotenoid that gives tangerines their deep orange color. They contain much more beta-cryptoxanthin than regular oranges. Your body converts beta-cryptoxanthin into vitamin A, which supports immune function, vision and healthy cell growth.
• Unique Benefits of Beta-Cryptoxanthin: This orange-colored carotenoid may offer its own health benefits beyond the activity of vitamin A. Studies in women have shown that high beta-cryptoxanthin intake is associated with higher bone mineral density and a lower risk of osteoporosis in postmenopausal women.
• Fiber: Tangerines also provide 1.6 grams of fiber per fruit, as well as potassium and folate.

The pomelo is the largest member of the citrus family and the ancestor of the grapefruit. If you find grapefruit too bitter, pomelo is a sweeter, sweeter alternative with wellness benefits.

• Daily Value of Vitamin C: An 8-ounce cup of pomelo contains a massive dose of vitamin C, about 130 milligrams. This represents more than 100% of your daily value.
• Potassium: Grapefruits are also great for heart health because they are rich in potassium.
• Antioxidant flavonoids: Grapefruits are exceptionally rich in flavonoids, such as naringin and naringenin, which have powerful antioxidant and anti-inflammatory properties.

Like grapefruit, pomelo contains compounds that may interfere with medications. If you are taking prescription medications, ask your doctor before consuming pomelo.

Kumquats are unique because you eat the whole fruit, skin and all. Since the peel of citrus fruits often contains a high concentration of beneficial compounds, eating kumquat gives you a nutritional boost.

The skin is rich in flavonoids, such as phloretin and acacetin, which have anti-inflammatory properties. These compounds neutralize free radicals and reduce oxidative damage, protecting you against inflammation and disease.

Look for firm citrus fruits. The skin should be smooth or slightly textured, with no soft spots or bruises.

Citrus fruits can be stored at room temperature for about a week. For longer storage, refrigerate them at 40°F or lower to extend their shelf life up to 4 weeks.