A resilient immune system is the difference between shrugging off an illness and being sidelined by it. Immune function naturally weakens with age, stress, poor sleep, and nutrient gaps, leaving many people catching every bug that circulates or recovering slowly when they do. Recognizing the signs of a weakened immune system, and understanding what strengthens it, puts you in a better position to stay well.

Immune health is a focus of Dr. James Petros, MD, founder of NexGen Health and a physician board certified in Functional Medicine, Regenerative Medicine, Anti-Aging Medicine, Physical Medicine, and Interventional Pain Management. A Tulane University School of Medicine graduate trained at Stanford, Dr. Petros founded the practice in 2021 to deliver science-driven care that helps patients live longer, healthier, more vibrant lives.

Signs Your Defenses May Be Low

A weakened immune system often shows itself in patterns rather than a single symptom.

• Frequent Infections: catching colds or illnesses more often than usual.
• Slow Recovery: taking longer than expected to bounce back.
• Persistent Fatigue: ongoing tiredness that can accompany low immunity.
• Lingering Symptoms: illnesses that drag on longer than they should.
• Slow-Healing Wounds: cuts and irritations that are slow to close.
• Recurring Issues: repeated infections in the same area or system.

What Weakens Immunity

Immunity depends on many systems working together. Chronic stress, poor sleep, nutrient deficiencies, gut imbalances, and ongoing inflammation all reduce the body’s ability to defend itself, and immune efficiency naturally declines with age. Because much of the immune system lives in the gut, digestive health plays a larger role than many people realize. Understanding these factors helps clarify where your defenses need reinforcement.

How NexGen Health Can Help

NexGen Health takes a proactive approach to immunity. Explore immunity IV therapy, the immunity peptide bundle, high-dose vitamin C therapy, glutathione IV therapy, and ozone therapy to see how natural defenses are strengthened.

Frequently Asked Questions About Immune Support

Can I really strengthen my immune system?

Yes, correcting deficiencies and supporting the body with targeted care can meaningfully improve immune resilience.

What weakens immunity most?

Chronic stress, poor sleep, nutrient gaps, gut imbalances, and inflammation are among the biggest contributors.

Why do I get sick so often?

Frequent illness can reflect an immune system under strain, and identifying the underlying factors often helps.

Does gut health affect immunity?

A large share of the immune system resides in the gut, so gut health strongly influences immune function.

When should I focus on immune support?

Proactive support is valuable year-round, and especially during stressful periods or illness seasons.

How soon will I notice benefits?

Some people feel more resilient within weeks as deficiencies are corrected and defenses are supported.

Why Choose NexGen Health

NexGen Health strengthens immunity before illness strikes, not just after. Under Dr. Petros, immune care is proactive and personalized. Located in San Jose and serving Los Gatos, Cupertino, Mountain View, and Silicon Valley, the practice helps patients stay well and perform at their best.

Build Resilience in San Jose

If you seem to catch every illness that goes around, contact NexGen Health in San Jose to schedule a consultation, call the practice, or book online.

Disclaimer: The information on this page is for educational purposes and is not a substitute for individualized medical advice, diagnosis, or treatment. Candidacy, therapies, and outcomes are determined during consultation, and individual results vary. Some therapies referenced may be provided on an off-label or investigational basis under physician supervision.