NutriStack
Symptom·Immune·Reviewed May 30, 2026
Supplements for Athlete immune resilience (frequent illness with hard training).
When athlete immune resilience (frequent illness with hard training) is the complaint, these are the supplements most often associated with it in the NutriStack library, ranked by how directly each one targets it and by the strength of the evidence.
Ranked by relevance, top first.
Relevance reflects how directly each supplement targets this symptom in the NutriStack map. Evidence is the supplement’s own rating. Open any name for the full profile.
- 01Vitamin D3Moderate84% match
Vitamin D regulates innate and adaptive immune function, and correcting deficiency is associated with fewer upper respiratory infections in athletes.
SuggestedVitamin D3 (cholecalciferol), 1000 to 2000 IU per day, dosed to a tested 25-hydroxyvitamin D level - 02Vitamin CModerate74% match
In people under heavy physical stress such as endurance athletes, vitamin C supplementation has roughly halved cold incidence in trials, though benefit is small in the general population.
SuggestedVitamin C (ascorbic acid), 500 to 1000 mg per day with food - 03ProbioticsModerate70% match
Certain probiotic strains support gut-associated immune tissue and may modestly reduce the frequency and duration of respiratory infections in active people.
SuggestedMulti-strain probiotic with Lactobacillus and Bifidobacterium, 10 to 25 billion CFU per day - 04ZincModerate67% match
Zinc is essential for immune cell development and function, and adequacy supports antiviral defense, with lozenges shortening cold duration in some trials.
SuggestedZinc bisglycinate or picolinate, 15 to 25 mg per day with food - 05ColostrumLimited60% match
Bovine colostrum supplies immunoglobulins and growth factors and may help maintain mucosal and gut barrier integrity during intense training, though evidence is preliminary.
SuggestedBovine colostrum powder, 10 to 20 g per day - 06L-GlutamineLimited56% match
Glutamine fuels immune and gut cells and plasma levels fall after prolonged exercise, but supplementation has not reliably reduced infection rates.
SuggestedL-glutamine powder, 5 g per day, with extra after long sessions
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