Vitamins & Minerals

Zinc for Colds: When It Works, When It Doesn't, and What You're Probably Doing Wrong

RDN explains zinc's real immune benefits vs. marketing hype. Learn when to take zinc lozenges, safe...

Herbs & Botanicals

My Skepticism on Andrographis for Colds: What the Data Actually Shows

I was taught to doubt andrographis for respiratory infections. A deep dive into the research—includi...

Vitamins & Minerals

Selenium's Immune Power: More Than Just Thyroid Support

Discover how selenium boosts glutathione, fights viruses, and supports immune function. Learn optima...