Best Drinks for Immunity: 5 Practical Choices

Water, plain kefir, and milk or fortified soy drink are practical top choices for supporting immunity. They can help with hydration or provide nutrients, but no drink alone is proven to prevent infections.

The best choice is one that fits your overall diet and health needs. For a wider overview, browse natural remedies by health goal.

What are the 5 best drinks for immunity?

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These five options serve different purposes:

1. Water: The simplest choice for meeting fluid needs.
2. Plain kefir: A fermented drink that can provide protein and live cultures.
3. Milk or fortified soy drink: A source of protein and, depending on the product, vitamin D.
4. 100% orange juice: A source of vitamin C, best enjoyed in a modest serving.
5. Unsweetened tea: A flavorful way to drink fluids, without a proven special effect on immunity.

This is a practical list, not a ranking established by head-to-head clinical trials. Most evidence relates to hydration, nutrients, or ingredients rather than to whether a particular drink prevents illness.

How can these drinks support immunity?

Water

How it may help: Water supports normal body functions, including the movement of nutrients and the production of saliva and mucus. Staying adequately hydrated is part of general health, but drinking extra water beyond your needs has not been shown to strengthen immunity or prevent infections.

How to use it: Make water your regular drink with meals and between meals. If plain water is unappealing, add washed fruit for flavor; see detox water for immunity for ideas. Infused water is primarily a way to make hydration enjoyable, not a reliable substitute for eating fruit.

Strength of evidence: The need for adequate hydration is well established. Evidence that water itself improves immunity or prevents infection in people who are already adequately hydrated is lacking.

Plain kefir

How it may help: Kefir is a fermented drink, usually made from milk, that can supply protein and may contain live cultures. The gut and immune system interact, but the presence of cultures in a drink does not prove it will prevent infections or improve immunity.

How to use it: Choose plain, unsweetened kefir made from pasteurized milk and check the label for live cultures. Drink it with a meal or alongside fruit. Check ingredients if you have a milk allergy; lactose content and tolerance can vary.

Strength of evidence: Direct evidence for kefir as a drink that prevents infections is not established here. In a 2024 animal study, a different fermented fruit drink affected gut bacteria and inflammation in mice. That finding does not show that kefir has the same effects in people.

Milk or fortified soy drink

How it may help: Milk and many fortified soy drinks provide protein, which the body needs to build and maintain tissues and immune-system components. Fortified products can also provide vitamin D, a nutrient involved in normal immune function. Getting enough nutrients matters most when your usual diet is inadequate; extra amounts do not necessarily provide extra protection.

How to use it: Have a glass with a meal or use it in an unsweetened drink. Check the label on a soy drink for protein and added vitamin D, because plant-based products vary. Choose the option that fits your dietary needs, and avoid milk if you have a milk allergy.

Strength of evidence: The roles of protein and vitamin D in normal body function are established. That does not mean drinking milk or fortified soy drink has been shown to prevent infections in people who already get enough of these nutrients.

100% orange juice

How it may help: Orange juice provides vitamin C, which supports normal immune-cell function. It can contribute to your daily intake, but juice is not a proven treatment for a cold or a guarantee against getting sick.

How to use it: Choose 100% orange juice rather than a sweetened orange drink. A small glass, such as 1/2 cup (about 120 mL), is one way to include it alongside a meal. Whole oranges are another option and provide fiber that juice may lack.

Juice contains naturally occurring sugar, and its acidity can bother some people's teeth or reflux symptoms. If citrus aggravates your symptoms, choose a different drink. Ask a pharmacist whether fruit juice affects any medication you take.

Strength of evidence: Vitamin C is an established nutrient for normal immune function, but evidence for orange juice specifically preventing infections is limited. More juice is not necessarily better, especially if it displaces whole fruit or other foods.

Unsweetened tea

How it may help: Unsweetened tea provides fluid and contains plant compounds called polyphenols. Those compounds are of scientific interest, but their presence does not establish that a cup of tea produces a meaningful improvement in immunity.

How to use it: Choose green or black tea without added sugar if you enjoy it. Drink it warm or cool, and consider a decaffeinated version if caffeine disrupts your sleep or makes you feel unwell. It can be part of your fluid intake, but it does not need to replace water.

Strength of evidence: Tea is a reasonable beverage choice, but evidence that it prevents infections is limited. Lab findings about tea compounds should not be treated as proof that drinking tea improves immunity in people.

Which drinks should you avoid for immunity?

Be cautious with drinks marketed as immune boosters, cleanses, or detox treatments. They may contain substantial added sugar or concentrated ingredients without good evidence that the finished drink prevents illness. Drinks with added high-dose vitamins or herbal extracts can also be unsuitable for some people or interact with medicines; check with a clinician or pharmacist before using them regularly.

Limit alcohol rather than treating it as a health drink. Choose pasteurized milk, kefir, and juice rather than unpasteurized products, which can carry harmful germs. This is especially important during pregnancy and for children, older adults, and people with weakened immune systems.

A drink does not flush toxins from the body. The liver and kidneys do most detoxification, while the lungs and gut help eliminate waste; sweat removes only trace amounts.

How much should you drink for immunity?

There is no special immunity target for fluid intake. For generally healthy adults, the National Academies' daily reference intakes for total water—from beverages and food combined—are:

These are general reference amounts, not a prescription to drink that much plain water. Food contributes some fluid, and individual needs vary with activity, heat, illness, pregnancy, and breastfeeding. Drinking regularly and responding to thirst is a practical approach for many healthy adults.

If you have kidney disease, heart failure, or another condition requiring a fluid limit, follow your clinician's advice rather than aiming for the amounts above. Do not force large quantities of water: drinking too much can be harmful. With vomiting or diarrhea, ask a clinician or pharmacist whether an oral rehydration solution is appropriate, particularly for a child or older adult.

Who should be careful, and when should you see a doctor?

People who are pregnant, have weakened immune systems, or take medicines should check with a clinician before using concentrated herbal or vitamin drinks. If you have diabetes, consider the sugar in juice and sweetened drinks as part of your eating plan. Parents should ask a child's clinician about suitable drinks for infants and young children; cow's milk should not be an infant's main drink before 12 months of age.

Contact a clinician if infections are unusually frequent, severe, or slow to improve, or if you have a persistent fever. If you have a weakened immune system and develop a fever, seek prompt medical advice rather than relying on drinks. Do not stop prescribed medication because of a beverage or supplement.

Seek urgent care for trouble breathing, confusion, fainting, inability to keep fluids down, or possible severe dehydration, such as producing little or no urine. Drinks can support recovery, but they are not a substitute for assessment or treatment when it is needed.