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Discover information about the Immune System and supporting Vitamins, Supplements and Traditional Herbs.

What is the Immune System?

The main function of your immune system is to protect you from external threats and keep you healthy. Think of your immune system as your body’s security team, trained to recognize and remove any threats while protecting your body’s peaceful residents. The first line of defense is to restrict the entry of unwanted foreign materials. The skin creates an excellent physical barrier but unwanted guests may still be inhaled or ingested. The acidity of stomach acid, mucosal membranes, and the presence of antibodies in saliva and tears all further help to prevent the entry of these substances into the body. The body’s second line of defense is the adaptive immune response, which includes antibody-antigen complex signals to other immune cells that this complex needs to be destroyed.

Do all immune support supplements work the same way?

Because the immune system is such a complex system, there is not a one-size-fits-all approach to supporting immune health. The various different types of white blood cells, immune proteins, and tissues and organs all have different nutrient requirements. Taking a single nutrient for immune health may assist in supporting one of these aspects of immune health, but if you are lacking other nutrients in your diet, then you may be falling short in getting total immune support.*

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Factors that Affect Immune Health

Your immune system is always patrolling your body to keep you at your best, but you need to keep your immune system healthy too. Lifestyle habits can impact immune health.


Sleep deprivation leads to decreased immune function as well as increased recovery times.1


Both physical and emotional stress can negatively impact the immune system.


Regular moderate-intensity exercise achieved on a near-daily basis is associated with better immune health with age.


The immune system needs proper nutrients to function optimally.

Best Sellers: Immune Support Vitamins and Supplements*

Shop our customer favorite immune support vitamins and supplements. Find one that fits your lifestyle and wellness goals.*

Chewable Vitamin C 500 mg with Rose Hips

Chewable Vitamin C 500 mg with Rose Hips

    One of the leading vitamins for immune support*

    "I like the fact they are chewable and you can take them without any liquid they dissolve and the flavor is nice" - Erick

1 for $5.99
Vitamin D3 250 mcg (10,000 IU)

Vitamin D3 250 mcg (10,000 IU)

    Helps maintain a healthy immune system*

    "It’s hard to find 10,000 units of Vitamin D in small pill form. Puritan’s Pride comes through again..." - Dla

1 for $7.59
Zinc 50 mg

Zinc 50 mg

    Top mineral for immune health**

    "I use this product daily and love it! Will definitely buy again." - Suz

1 for $3.99

Immune Health FAQs

Frequently Asked Questions about Immune System Health and Immune Support. Be in the know about immune system health. Immune support is an important part of our overall well-being.*


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1Krueger JM, Majde JA, Rector DM. Cytokines in Immune Function and Sleep Regulation.; 2011. doi:10.1016/B978-0-444-52006-7.00015-0