Dietary supplement formulated with encapsulated lactoferrin and vitamin D3. Encapsulation in liposomes increases its effectiveness in the target cell, its tolerance and stability over time. It contains lactoferrin, a glycoprotein belonging to the transferrin family, which is found naturally in breast milk and in mammalian secretions (colostrum, saliva, tears, bronchial secretions, etc.). It also contains vitamin D3 which contributes to the normal functioning of the immune system and to the normal maintenance of bones.