7 supplements compared

Best Supplements for Immune Support

Evidence-based supplement rankings for immune support. Every comparison reviewed by our registered dietitian.

Written by Editorial Team·Medically reviewed by Angelique Nicole R. Villegas, RND

Supplement Comparisons

Which Supplement Is Best for Immune Support?

Andrographis

Andrographis has Cochrane meta-analysis support for faster recovery from upper respiratory infections. We review standardized extracts and the Kan Jang evidence base.

4 products ranked

Beta-Glucan

Beta-glucan primes innate immunity via dectin-1 receptors. Source (yeast vs oat vs mushroom) and 1,3/1,6 branching structure determine efficacy. RCT-backed picks.

4 products ranked

Colostrum

Bovine colostrum IgG and growth factors support mucosal immunity per Brinkworth 2004 and Shing 2009 RCTs. IgG percentage is the key buying criterion — here's why.

4 products ranked

Echinacea

Limited Evidence

The Cochrane review of 24 RCTs found echinacea cut cold risk by ~35% — but only for specific preparations. We explain which species and formula actually have evidence.

4 products ranked

Elderberry

Moderate Evidence

Elderberry reduced flu duration by 4 days in the Zakay-Rones RCT. We break down which products match the clinical trial formula — and which are diluted syrups.

4 products ranked

Reishi

Moderate Evidence

Reishi activates NK cells and macrophages — the immune cells that decline most with age. We explain beta-glucan quality standards and which products actually deliver.

4 products ranked

Vitamin C (Ascorbic Acid)

Limited Evidence

29 RCTs settled it: vitamin C doesn't prevent colds but cuts duration 8-14%. We explain the forms that actually absorb and who benefits most.

3 products ranked

This content is for educational purposes only and is not medical advice. These statements have not been evaluated by the FDA. Always consult your healthcare provider before starting any supplement.