Colostrum: what the trials show

Bovine colostrum (ARMRA) · evidence checked 2026-10-25

What the research shows

Grades are calculated from the studies listed, by fixed rules.

• Colostrum strengthens the gut barrierPromising

  Two small trials measured a lab marker (a sugar test of gut permeability) under stress — heavy exercise, or painkillers like indomethacin — and colostrum blunted the rise. Neither measured bloating, and in patients already on painkillers long-term it made no difference.

  • Double-blind randomized trial, 12 people, 2 weeks (2011) — primary outcome: improved. Funder not checked.
  • Open-label randomized trial, 22 people (2001) — primary outcome: improved. Funder not checked.
• Colostrum helps prevent coldsPromising

  One triple-blind trial at 0.5–1 g a day, with an author paid by a colostrum maker; the benefit was in the busier medical students, not their peers. ARMRA’s research page cites a pooled analysis of cold studies too — mostly in athletes.

  • Double-blind randomized trial, size not stated, 15 weeks (2023) — primary outcome: improved. Funded by the manufacturer.
• Colostrum supports muscle and body compositionTested — no effect found

  A double-blind trial at 25 g a day for 12 weeks found no change in body weight or composition (some aerobic measures did improve, in trained men).

  • Double-blind randomized trial, 28 people, 12 weeks (2025) — primary outcome: no difference from placebo. Funded by independent sources.
• Colostrum gives you thicker hair (“79% noticed thicker hair”)No real evidence

  The figure is a survey of the brand’s own customers — no control group, nothing published. Surveys like this never count toward a grade. For what does grow hair, see /hair-loss.

  • Company's own material, size not stated (2026) — primary outcome: improved. Funded by the manufacturer. Not counted toward the grade.