Evidence-Based Stack
Immunity Stack
The foundational immune stack — vitamin D year-round, zinc + quercetin + vitamin C for acute illness, not daily mega-dosing.
Daily mega-dose 'immune support' marketing isn't evidence-based for preventing illness in already-healthy people. What is: correcting vitamin D deficiency (a real problem for most of the indoor-living population), and having a ready acute-illness trio (zinc + quercetin + vitamin C) that reduces cold duration. The 'zinc ionophore' mechanism — quercetin helping zinc enter cells — is the most-studied acute viral combination. Skipped: echinacea (mixed evidence), elderberry (modest acute benefit with a possible immune-stimulation concern in autoimmune users), colostrum (thin data).
What's in it
Foundational immunomodulator — T-cell function, reduced respiratory infection risk in deficient users. Year-round daily.
Dose: 1,000-2,000 IU/day with a fat-containing meal; higher if blood level is below 30 ng/mL
Full Vitamin D profile →Acute viral support — reduces cold duration in multiple meta-analyses. Not for chronic high-dose.
Dose: 15-30 mg daily baseline; 50 mg split across the day during acute illness (max 7 days)
Full Zinc Picolinate profile →Partner to zinc in acute illness stacks. Modest duration reduction in normal users, stronger in physical-stress populations.
Dose: 500 mg daily baseline; 1-2 g/day split during acute illness
Full Vitamin C profile →Zinc ionophore + mast cell stabilizer. Helps zinc enter cells during viral acute phase; also useful for allergies.
Dose: 500-1,000 mg/day during acute illness; poor bioavailability without phytosome form
Full Quercetin profile →How to take it
Vitamin D daily, year-round. Low-dose zinc (15 mg) daily is reasonable insurance. At first sign of a cold: bump zinc to 50 mg/day (split), add 1-2 g vitamin C (split), and 500-1,000 mg quercetin. Stop the acute protocol within 7 days of symptom resolution — chronic high-dose zinc causes copper deficiency.
Cautions
Long-term zinc >40 mg/day causes copper deficiency; co-supplement copper (2 mg) if using high-dose for more than 2 weeks. Vitamin D at very high chronic doses (>5,000 IU without blood monitoring) can cause hypercalcemia. Vitamin C at >1 g/day can increase kidney stone risk in users with a stone history.
Interactions between stack members
These are interactions Formulate has catalogued between the substances above. Review before combining if any apply.
Next steps
Educational only. Stack recommendations are not medical advice. Discuss any new supplement protocol with your clinician, especially if you take prescription medication or have a chronic condition.