Here are the top 3 supplements that scientific studies and clinical guidance suggest may help support immune function and potentially lessen flu symptoms.

Written By Kristine Garverick

🛡️ 1. Vitamin D

Why it helps:
Vitamin D plays a key role in immune regulation and may help your body respond more effectively to respiratory viruses. Research suggests regular vitamin D supplementation may reduce the risk of acute respiratory infections, particularly in people with low baseline levels.

Notes:

  • Low vitamin D levels are common at higher latitudes and in winter.

  • Best taken daily (e.g., 1000–2000 IU or as directed by your clinician).

  • Consider testing levels for personalized dosing.

🧬 2. Zinc

Why it helps:
Zinc is essential for immune cell function, especially for the cells that defend against viruses. Some evidence shows that zinc supplementation — particularly when started early in an infection — may help reduce symptom severity and shorten duration of respiratory illnesses.

Notes:

  • Zinc lozenges or short-term supplementation at onset of symptoms are often used clinically.

  • Avoid high-dose long-term zinc without medical supervision (can affect copper absorption).

🍇 3. Elderberry (Sambucus nigra) Extract

Why it helps:
Elderberry is rich in flavonoids and antioxidants that may support immune defense and reduce severity of flu symptoms. Some clinical trials suggest elderberry can shorten symptom duration and reduce severity when taken at the start of respiratory illness.

Notes:

  • Best evidence is for elderberry extract during early symptom stages.

  • Quality and dosage vary by product — choose standardized formulas.

🧠 Quick Tips

  • These supplements support immune health but do not replace flu vaccination.

  • Start before peak flu season if you want preventive benefits.

  • They work best as part of a comprehensive immune strategy that includes good sleep, nutrition, stress management, and vaccination.

  • Always check with a provider before starting supplements, especially if you’re pregnant, breastfeeding, immunocompromised, or taking medications.

📌 Summary

Supplement:

Vitamin D Supporting immune regulation; Daily routine (especially in winter)

Zinc Aiding antiviral defenses; Early symptoms or short-term

Elderberry Reducing severity/duration; At onset of flu symptoms

Here is the link to check out the PureDefense Supplement

This information is provided for educational purposes. Talk to your healthcare provided prior to starting any supplements.

Kristine Garverick
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