Valfoo Lactoferrin VLF-1 is 100% made in Switzerland, from raw material to finished product. VLF-1 is produced from fresh, undenatured Swiss cow milk by using pharmaceutical-grade processing technologies. Lactoferrin is an iron-binding glycoprotein that can be found in the milk of most mammals. It is also known as a multifunction protein and a key component of the body's immune system, helping to support immunity, health, and nutrition.