Colostrum (Bovine) for Immune Function

Research suggests that bovine colostrum supplementation may support immune function, particularly by helping to maintain gut barrier integrity, sustaining secretory IgA levels, and reducing the risk of upper respiratory symptoms, with the most consistent findings coming from studies in athletes undergoing heavy training loads. The available evidence includes narrative reviews, mechanistic reviews, and supplementation studies in both humans and animals, and the overall direction leans supportive, though several reviews characterize the findings as mixed due to inconsistent study designs, variable dosages, and differing product compositions across the literature. Studies indicate that the immunoglobulins, lactoferrin, and other bioactive components in bovine colostrum survive digestion to a meaningful degree and may interact with human immune pathways, though the precise mechanisms remain incompletely understood. Reviewers and authors consistently note that more rigorous, well-powered clinical trials are needed before firm recommendations can be made, and some reviews caution that early promising findings have not always been replicated under more controlled conditions.