Best Supplements for Immune Support

A well-functioning immune system depends on adequate levels of several key micronutrients. Research suggests that Vitamin D, Zinc, and Omega-3 fatty acids each play distinct roles in supporting healthy immune function. Our formulary ranks every ingredient by the bioavailability of each form — so you can select the forms your body can actually absorb and use.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

Research-Backed Ingredients

Frequently Asked Questions

What supplements may support healthy immune function?

Vitamin D3, Zinc (Picolinate or Bisglycinate), and Omega-3 fatty acids are among the most studied ingredients for supporting healthy immune function. These supplements are not intended to diagnose, treat, cure, or prevent any disease, including infections or immune disorders.

What is the best form of zinc for immune support?

Zinc Picolinate and Zinc Bisglycinate are our top-ranked forms for superior absorption compared to Zinc Oxide, which demonstrates poor bioavailability. Zinc plays a well-established role in supporting healthy immune cell function.

Does Vitamin D support immune health?

Vitamin D receptors are found on nearly every immune cell, and research suggests that maintaining adequate Vitamin D levels supports healthy immune function. Vitamin D3 (Cholecalciferol) demonstrates superior bioavailability over Vitamin D2 and is our preferred form. These are structure/function claims — consult your healthcare provider for clinical guidance.