Lactoferrin is an 80 kDa iron-binding glycoprotein found in highest concentration in colostrum (7–14 mg/mL) and mature breast milk (1–2 mg/mL). It is also secreted by neutrophils during infection, making it a frontline immune molecule. Bovine lactoferrin (bLf), derived from cow's milk whey, shares 69% amino acid homology with human lactoferrin and is widely used in supplementation.
Meta-analyses confirm lactoferrin's superiority over standard iron salts for treating iron-deficiency anemia (better absorption, fewer GI side effects). Human trials show immune benefits including reduced upper respiratory infection duration and severity. A 2021 Italian RCT (Campione et al.) found lactoferrin supplementation significantly reduced COVID-19 severity and symptom duration.
How does lactoferrin differ from regular whey protein?
Whey protein provides amino acids for muscle synthesis; lactoferrin is a bioactive signaling protein. At therapeutic doses (100–300 mg), lactoferrin modulates immune cells and binds iron — functions that standard whey protein does not perform.
Should I take lactoferrin fasted or with food?
Most research uses fasted administration (30–60 minutes before meals) to allow intact lactoferrin to interact with intestinal receptors before being exposed to digestive enzymes. Enteric-coated forms offer more flexibility.
Can lactoferrin cause iron overload?
No. Lactoferrin is an iron-binding protein and actually reduces free iron toxicity. It does not saturate at physiological doses. For iron supplementation purposes, lactoferrin-bound iron (lactoferrin chelate) is gentler on the GI tract than iron salts.