A layered immune protocol works across multiple pathways simultaneously. Here is a research-supported stack from foundation to acute response.
Foundation (Daily)
Vitamin D3 (2,000–4,000 IU) + K2 (100mcg): deficiency directly impairs innate and adaptive immunity — 70% of people are insufficient. Zinc (15–25mg): cofactor for over 300 immune enzymes. Medicinal mushrooms (Reishi or Turkey Tail, 1–2g dual extract): daily beta-glucan exposure trains the innate immune system.
Seasonal Prevention
Astragalus (500mg, 8-week cycles in autumn/winter): stimulates interferon production and NK cell activity. Elderberry (1 tsp syrup 3× weekly): ongoing anthocyanin exposure. Probiotics: 70% of immune tissue lives in the gut — maintaining microbiome diversity is an immune strategy.
Acute Response (First Signs of Illness)
Elderberry syrup: 1 tsp every 2–3 hours in the first 24 hours. Echinacea (standardised to 4% echinacosides, 900mg/day): proven to reduce cold severity and duration. High-dose vitamin C (2–3g divided doses): immune cell fuel. Zinc lozenges: clinically shown to reduce cold duration by 33%.
Recovery Support
Reishi decoction: supports the return to immune balance after infection. Bone broth: provides glycine, proline, and minerals depleted during illness. Avoid returning to hard exercise until 48 hours fever-free — reactivation risk is real.