Human colostrum (first 3–5 days post-partum) contains 7–14 mg/mL lactoferrin — decreasing to 1–2 mg/mL in mature milk. Bovine colostrum contains similar concentrations (7–15 mg/mL). This high concentration provides the newborn gut with bacteriostatic protection, gut maturation support, and iron regulation before the infant's own immune system becomes functional.

Should adults take colostrum supplements?

Bovine colostrum provides lactoferrin alongside immunoglobulins, growth factors (IGF-1, EGF), and other bioactives. It is a reasonable approach for broad immune support, though dedicated lactoferrin supplements provide higher standardized lactoferrin doses.

Is lactoferrin from breast milk research applicable to adults?

Yes, with the understanding that adult immune systems are fully developed and the response may be quantitatively different. The mechanisms (iron binding, bifidogenic microbiome promotion, mucosal immunity modulation) are shared across ages.