Colostrum — Bovine First Milk Supplement — Immunity
First milk produced after birth, rich in immunoglobulins, growth factors, and immune factors. Moderate evidence for gut health and immunity.
Overview
Bovine colostrum is the first milk produced by cows in the 24-72 hours after calving. It is a complex biological fluid containing high concentrations of immunoglobulins (primarily IgG, at 50-150 mg/mL — 100x higher than regular milk), lactoferrin, lysozyme, growth factors (IGF-1, TGF-beta, EGF), cytokines, oligosaccharides, and antimicrobial peptides. These components evolved to provide passive immunity and GI tract development to newborn calves, but many are bioactive in adult humans. In clinical research, bovine colostrum supplementation has demonstrated moderate evidence for: reducing the incidence and severity of upper respiratory tract infections (URTI) in athletes and the general population, improving gut barrier function ('leaky gut'), reducing NSAID-induced intestinal permeability, and supporting immune function in immunocompromised patients. A Cochrane-quality systematic review by Jones et al. found that colostrum reduced URTI episodes by approximately 38% compared to placebo in athletes. For gut health, bovine colostrum reduces intestinal permeability markers and may benefit conditions associated with gut barrier dysfunction including IBS, IBD (ulcerative colitis), and exercise-induced GI distress. Bovine IgG survives gastric digestion to a significant degree and can bind pathogens and toxins in the GI tract. Quality varies significantly between products — hyperimmune colostrum (from cows immunized against specific pathogens) provides targeted antibodies. Processing temperature is critical: high-heat processing denatures immunoglobulins and growth factors.
Indications
- Dietary supplement: Immune support and gut health
- Evidence-supported: Upper respiratory infection prevention in athletes
- Evidence-supported: Gut barrier function improvement ('leaky gut')
- Evidence-supported: NSAID-induced intestinal permeability reduction
- Emerging evidence: Exercise-induced GI distress
- Emerging evidence: Immune support in immunocompromised patients
Mechanism of Action
Bovine IgG antibodies survive gastric digestion and bind pathogens, toxins, and antigens in the GI tract, providing passive immune protection
Dosing
| Compound | Dose | Frequency | Notes |
|---|---|---|---|
| Bovine Colostrum (powder/capsule) | 10-20 g | Once or twice daily | Standard dose from clinical trials for immune and gut health |
| Bovine Colostrum (concentrated) | 1-3 g | Once daily | Concentrated colostrum extract (higher IgG per gram) |
Evidence Grade
GRADE B
Safety & Contraindications
- Generally well-tolerated and safe
- GI upset: bloating, nausea, diarrhea in some individuals (especially initially)
- Avoid in cow's milk protein allergy
- Contains trace amounts of IGF-1 and other growth factors — theoretical concern for cancer promotion (no clinical evidence of risk at supplement doses)
- Lactose content may cause issues in lactose-intolerant individuals
- Product quality varies dramatically — low-heat processing essential to preserve bioactives