Goal-Based Guide
Probiotics and vitamin D are the best-supported immune picks, followed by zinc. NAC comes up from only a few sources, and vitamin C has less support than its reputation suggests. Here's what each one does.
Rather than mega-dosing vitamin C, these are the immune-supporting supplements with the most support and clinical evidence.
Ranked by the verdict on whether each supplement works, worked out from every counted mention. Each dot is one source: a researcher or a study.
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Probiotic supplements or fermented foods are worth taking.
30 sources: 15 positive, 14 partly, 1 negative
Vitamin D supplements are worth taking.
12 sources: 6 positive, 6 partly
Zinc supplements are worth taking.
6 sources: 2 positive, 4 partly
Vitamin C supplements are worth taking.
5 sources: 1 positive, 3 partly, 1 neutral
NAC is worth taking.
2 sources: 2 positive
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Immune support that comes up across many protocols:
This page shows you which supplements researchers agree on for immune support. A free account opens the dose, form and timing for each supplement, with the interactions to watch. Pro adds chat answers drawn from 3,700+ hours of recorded interviews with 380 researchers and doctors, plus 48,500+ research studies, each one cited.
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