Deficiency correction, not immune 'boosting'
Immune Health & Aging
Immune function changes with age (immunosenescence). Correcting a genuine nutrient shortfall helps; layering on 'immune boosters' does not have comparable support.
What the evidence says
- Zinc and vitamin D deficiency are more common after 65 and are worth testing for rather than guessing at.
- Vaccination remains the best-evidenced immune intervention for older adults.
- Long-term high-dose zinc can cause copper deficiency — a real risk in this age group.
Supplements in this topic
Vitamin D
Essential for bone health and immune function. Supplementation helps people who are deficient, but routine mega-dosing shows mixed benefits for healthy adults.
Verdict: Worth taking if deficient; test levels first.
Zinc
Effective at reducing the duration of common cold symptoms when started early and supports immune function in deficient individuals.
Verdict: Works for acute colds and deficiency.
Probiotics
Helpful for specific conditions like antibiotic-associated diarrhea and some IBS subtypes. General health benefits are highly strain-specific.
Verdict: Strain-specific effects; not a one-size-fits-all health booster.
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