Vitamin C and Your Immune System

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By Dr. Justin Marchegiani

Why Vitamin C Is Crucial for Your Immune System

As the seasons shift and viruses circulate, your immune system needs extra support to keep you healthy. Vitamin C, also known as ascorbic acid, is one of the most powerful tools in your natural defense arsenal. Long praised for its role in fighting colds, Vitamin C is far more than just a go-to during flu season—it's a key player in reducing inflammation, enhancing immune cell function, and supporting overall vitality.

Emerging research confirms that individuals with low vitamin C levels may be more susceptible to infections and even experience more severe illness outcomes. So, whether you're looking to prevent illness or recover more quickly, loading up on this super vitamin is smart.


What Is Vitamin C?

Vitamin C is a water-soluble and powerful antioxidant that helps neutralize free radicals, supports collagen production, boosts nutrient absorption, and fuels your immune system. Regular dietary intake or supplementation is essential since your body can't produce or store it.

In functional medicine, we recognize that vitamin C is integral in supporting white blood cell activity, reducing oxidative stress, and shortening the duration of common infections.

Top Health Benefits of Vitamin C

Vitamin C does much more than support your immune health. Here’s a deeper dive into its impressive benefits:

Vitamin C-Rich Foods to Include Daily

Whole foods are the best first step. Here are some of the top dietary sources:

While these foods are great for maintaining baseline levels, therapeutic doses are typically needed when your immune system is under attack.

When and How to Supplement with Vitamin C

During increased immune stress (cold, flu, travel, stress), supplementing 2,000 mg 3–4x daily may provide noticeable benefits. Buffered or liposomal forms are often better tolerated and absorbed.

🔗 Click here to see the vitamin C supplement I recommend

Functional Medicine Lab Testing for Nutrient Deficiencies

A deeper look into your nutrient status may be warranted if you struggle with recurring illness, fatigue, or poor recovery. Functional medicine testing can reveal subclinical vitamin C deficiency, oxidative stress levels, and immune function imbalances. Lab panels like organic acid testing or micronutrient testing can offer insights into:

🎯 Click here to schedule a free consult with Dr. J and learn if targeted supplementation is right for you.

 

Your Immune Boost Protocol

Here’s what to do when you feel the first sign of illness:

Dr. J’s Functional Immune Protocol


Takeaway

Vitamin C is one of the safest, most affordable, and most effective ways to boost your immunity, especially when paired with a nutrient-dense diet and healthy lifestyle. Whether trying to prevent illness or speed up recovery, it should be part of your regular health toolkit.

Don’t wait until symptoms hit—build your resilience now.

🧬 Want to test your nutrient levels and get a personalized immune plan?
Schedule your free consult today at www.justinhealth.com/free-consult

References:

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Recommended Product

Vitamin C Synergy

 

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