Also known as: Apolactoferrin, Bovine lactoferrin, Iron-binding protein, LF
FoundationalGood evidence
An iron-binding protein found in milk and in the body's own secretions, working largely by depriving unwanted organisms of iron. Expensive, and the iron-saturation status of the product changes what it does.
Typical dose
200.0–400.0 mg per day
Empty stomach or between meals
What it is
Lactoferrin is an iron-binding glycoprotein present in milk, particularly colostrum, and in human tears, saliva and other secretions. It forms part of the body's own front-line defences.
Commercial lactoferrin is isolated from bovine milk or whey. It is expensive to produce, which is reflected in the price and in how often products are underdosed.
The important variable is iron saturation. Apolactoferrin is iron-free and can bind iron; holo-lactoferrin is already saturated and cannot. Most supplements use the apo form, and if a label does not specify, that is worth asking about, because the two behave differently.
How it works
The primary mechanism is iron sequestration. Many bacteria require iron to grow, and lactoferrin binds free iron with high affinity, effectively starving them of it.
It also has direct effects on bacterial membranes independent of iron binding, and interacts with immune cells in the gut lining.
There is a further and somewhat counterintuitive strand: lactoferrin appears to improve iron absorption and status in people who are short of it, despite binding iron. The proposed explanation is that it delivers iron more efficiently to the intestinal cells while keeping it away from bacteria.
What the evidence shows
Research on iron status is among the more interesting areas, with trials reporting improved markers in people with low iron, sometimes with better digestive tolerability than conventional iron supplements.
There is a reasonable body of work on gut and respiratory outcomes, with some trials reporting reduced symptom days, though findings are mixed and trial quality varies.
For performance or body composition there is essentially no evidence. Lactoferrin is a gut and immune ingredient, and any sports positioning is extrapolation rather than application.
Dosing
Typical supplemental range is 200 to 400 mg daily. Some trials have used higher amounts, particularly for iron-related outcomes.
Take on an empty stomach or between meals, since it is a protein and will be digested alongside a meal like any other.
Check it is apolactoferrin unless there is a specific reason for the saturated form, and check the actual milligram content rather than the weight of a whey-derived material it may be blended into. Because it is genuinely expensive, cheap lactoferrin products are usually cheap for a reason.
At a glance
Common forms
Apolactoferrin, Holo-lactoferrin, Bovine lactoferrin powder, Liposomal lactoferrin, Within colostrum products
Half-life / duration
Acts largely locally in the gut; effects accrue over weeks
Timing
Empty stomach or between meals
Competition status
Permitted — not on the WADA Prohibited List
Category
Foundational
Safety and side effects
Lactoferrin is well tolerated at typical doses, with few adverse effects reported. Mild digestive upset is the occasional complaint.
Milk allergen declaration applies, since it is derived from bovine milk, and anyone with a milk allergy should avoid it.
Because it interacts with iron handling, anyone who has been told they retain too much iron should speak to their doctor first, as should anyone taking iron supplements.
Who should avoid it
Milk allergen declaration applies; avoid with a milk allergy. Speak to your doctor before use if you have been told you retain too much iron, or if you take iron supplements. Speak to your doctor if you take regular medication. Not suitable for vegans.
This entry is provided for information only. Food supplements should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Consult a qualified healthcare professional before use if you are pregnant, breastfeeding, taking medication or under medical supervision.
