As flu season and a likely winter COVID-19 wave approach, you may encounter both proven and unproven methods claiming to “boost” your immune system. Before you reach for supplements, learn more about how the immune system works, how vaccines give us the best protection against many illnesses, and how some lifestyle factors can help your immune system function properly.
What is the immune system?
The immune system is the body’s first line of defense against invaders like viruses, bacteria, or fungi. You develop immunity—or protection from infection—when your immune system has learned how to recognize an invader and attack it before it makes you sick.
How can you boost your immune system?
You can teach your immune system how to fight back against dangerous invaders by staying up to date on vaccines. This season’s updated flu and COVID-19 vaccines target newer variants and are recommended for everyone 6 months and older.
Vaccines reduce your risk of getting sick and spreading illness to others. Even if you get infected with a disease after you’ve been vaccinated against it, the vaccine will still increase protection against severe illness, hospitalization, and death.
People who have compromised immune systems due to certain health conditions or because they need to take immunosuppressant medications may need additional vaccine doses.
Find out which vaccines you and your children need by using the CDC’s Adult Vaccine Assessment Tool and Child and Adolescent Vaccine Assessment Tool. Talk to your health care provider about the best vaccines for your family.
Find pharmacies offering updated flu and COVID-19 vaccines by visiting Vaccines.gov.
Can supplements boost your immune system?
Many vitamin, mineral, and herbal supplements that are marketed as “immune boosting” have little to no effect on your immune system. Research is split on whether some of these supplements—like vitamin C, vitamin D, and zinc—are capable of helping your body fight infections.
Plus, the Food and Drug Administration typically does not review supplements until after they have reached store shelves, and companies can sell supplements without notifying the FDA. This means that supplements may not be accurately labeled.
Eating a diverse diet rich in fruits and vegetables is the best way for most people to absorb nutrients that support optimal immune system function. People with certain health conditions and deficiencies may need specific supplements prescribed by a health care provider. For example, people with anemia may need iron supplements in order to maintain appropriate iron levels.
Before you begin taking a new supplement, talk to your health care provider, as some supplements may interact with medications you are taking or worsen certain health conditions.
Can lifestyle factors strengthen your immune system?
Based on current evidence, there is no direct link between lifestyle changes and enhanced immunity to infections. However, maintaining a healthy lifestyle through the following practices can help ensure that your immune system functions as it should:
- Eat a diet rich in fruits and vegetables.
- Exercise regularly.
- Don’t smoke.
- Limit or eliminate alcohol consumption.
- Get seven or more hours of sleep per night.
- Reduce stress.
Taking steps to avoid contact with germs also reduces your risk of getting sick. Safer sex barriers like condoms protect against HIV, while wearing a high-quality, well-fitting mask—especially in high-risk environments—protects against COVID-19. Both of these illnesses can reduce your production of white blood cells, which protect against infection.
For more information, talk to your health care provider.