Both come from cow's milk. Both support gut and immune health. But the molecules, doses, and indications are different — and the right choice depends on whether you want a targeted single-protein intervention or a broader bioactive matrix.
Lactoferrin and bovine colostrum are the two most popular milk-derived bioactive supplements. They overlap mechanistically — both support gut barrier function, modulate immunity, and have antimicrobial activity — but they are not interchangeable. Choosing between them (or combining them intelligently) matters more than most product marketing implies.
Lactoferrin is a single 76 kDa iron-binding glycoprotein, purified from cow's milk whey to >95% purity. A typical 200 mg capsule is essentially pure lactoferrin protein. The mechanism is precise: iron sequestration, lactoferricin release, intelectin-1 receptor binding, tight junction upregulation.
Bovine colostrum is the first milk produced after calving, freeze-dried into a powder containing dozens of bioactive components: immunoglobulins (IgG, IgA, IgM), lactoferrin (typically 0.5–2% by weight), proline-rich polypeptides (PRPs), growth factors (IGF-1, TGF-β, EGF), oligosaccharides, lysozyme, lactoperoxidase, and cytokines. A 1,000 mg colostrum capsule contains perhaps 5–20 mg of native lactoferrin alongside everything else.
Think of it this way: lactoferrin is a precision drug. Colostrum is a broad bioactive cocktail.
| Mechanism | Lactoferrin | Colostrum |