The Delivery Masters: How Donkey Milk Transports Rare Nutrients

In the world of high-performance skincare, the differentiator is not just what is in the bottle, but how those nutrients reach their cellular destination. Recent research in milk proteomics and genomics has revealed that donkey milk is a highly evolved biological delivery system. Unlike traditional dairy sources, donkey milk utilizes specialized carrier proteins and unique biological structures to transport fragile vitamins and minerals with high precision.

1. Transcobalamin-1: The Elite Escort for Vitamin B12

Vitamin B12 (Cobalamin) is essential for DNA synthesis and cellular energy, yet it is notoriously unstable and difficult for the skin to absorb in its raw form. Donkey milk addresses this through a specific protein called Transcobalamin-1 (TCN1).

• Superior Stability: Donkey milk contains high levels of TCN1, which acts as a protective "escort" for Vitamin B12, shielding it from environmental degradation.
• Targeted Bioavailability: TCN1 binds tightly to Vitamin B12, ensuring the nutrient remains bioactive until it reaches cellular receptors in the skin.
• Regenerative Support: By ensuring the delivery of stable B12, donkey milk supports the proliferation and health outcomes of skin cells, mirroring the signaling pathways found in high-performance biological fluids.

2. Selenoprotein F: Harvesting the Power of Organic Selenium

Selenium is a trace mineral with antioxidant power far exceeding that of Vitamin E, but it must be in an "organic" form to be effectively utilized.

• The SELNF Advantage: Proteomic characterization of donkey milk has identified Selenoprotein F (SELNF) as a critical component that remains robust throughout the lactation stage.
• Antioxidant Defense: SELNF incorporates selenium into a protein structure that directly neutralizes reactive oxygen species (ROS), helping to maintain cellular homeostasis and prevent inflammation.
• Metabolic Synergy: The presence of these antioxidant proteins helps regulate fine-tuning cellular processes and immune responses, making it an ideal ingredient for barrier repair.

3. The "Monogastric" Advantage for Bioactive Integrity

The delivery efficiency of donkey milk is rooted in the donkey's unique biology as a monogastric (single-stomach) animal.

• Pure Secretion: Unlike ruminants (cows or goats), whose complex multi-chambered stomachs can modify or degrade nutrients through fermentation, donkeys process nutrients differently.
• Bioactive Preservation: This simpler digestive process leads to less degradation or modification of delicate regulatory molecules, such as miRNAs and transport proteins, before they are secreted into the milk.
• miRNA Abundance: This biological efficiency results in a significantly higher abundance of miRNAs—approximately 7.74% of total annotated RNA—compared to ruminants like goats (1.57%) or cows.
• Natural Emulsification: The high whey-to-casein ratio in donkey milk facilitates the deep penetration of these carrier proteins into the epidermal layers.

References & DOI

• Cendron, F., et al. (2024). Analysis of miRNAs in milk of four livestock species. BMC Genomics, 25:859. DOI: 10.1186/s12864-024-10783-4
• Dong, et al. (2023). Analysis of the Differentially Expressed proteins in donkey milk in different lactation stages. Foods. DOI: 10.3390/foods12102061
• Vincenzetti, S., et al. (2021). Vitamins in Human and Donkey Milk: Functional and Nutritional Role. Nutrients. DOI: 10.3390/nu13041033