Your immune system consists of a complex collection of cells, processes, and chemicals that constantly defend your body against invading pathogens, including viruses, toxins, and bacteria.
Keeping your immune system healthy year‑round is key to preventing infection and disease.
Making healthy lifestyle choices — nutritious foods, good sleep, regular exercise — are the most important ways to bolster your immune system.
Research also shows that supplementing with certain vitamins, minerals, herbs, and other substances can help improve immune response and potentially protect against illness.
However, some supplements can interact with medications or may not be appropriate for certain health conditions. Always speak with a healthcare professional before starting any supplements.
Here are 15 supplements known for their immune‑boosting potential.
1. Vitamin D
Vitamin D is a fat‑soluble nutrient essential to immune system health.
It enhances the pathogen‑fighting effects of monocytes and macrophages — white blood cells that are vital to immune defence — and reduces inflammation, supporting immune response.
Many people are deficient in vitamin D, which may negatively affect immune function. Low levels are associated with increased risk of upper respiratory infections, including influenza and allergic asthma.
Studies show that supplementing with vitamin D may improve immune response and help protect against respiratory tract infections.
2. Zinc
Zinc is commonly added to immune‑support supplements and lozenges because it is essential for immune cell development and communication.
It plays a key role in inflammatory response and helps maintain tissue barriers that prevent pathogens from entering the body.
Zinc deficiency significantly impairs immune function, increasing risk of infection and disease — including pneumonia.
Globally, zinc deficiency affects around 2 billion people and is especially common in older adults.
Numerous studies show that zinc supplements may help protect against respiratory infections like the common cold.
3. Vitamin C
Vitamin C is one of the most popular immune‑support supplements due to its vital role in immune cell function.
It enhances the ability of immune cells to protect against infection and supports healthy cellular turnover.
Vitamin C is also a powerful antioxidant, protecting cells from oxidative stress — a process linked to weakened immunity and numerous diseases.
Supplementing with vitamin C has been shown to reduce the duration and severity of upper respiratory infections, including the common cold.