Vitamins found in milk
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Key Vitamins in Milk: Vitamin D, B Vitamins, and Fat-Soluble Vitamins
Milk, both human and bovine, is a rich source of several essential vitamins, including vitamin D, a range of B vitamins, and other fat-soluble vitamins such as A, E, and K. The concentrations and bioavailability of these vitamins can vary based on species, maternal diet, supplementation, and even the time of day the milk is collected 1235.
Vitamin D in Milk
Vitamin D and its metabolites are present in both human and cow's milk. The main forms found are vitamin D2, vitamin D3, and 25-hydroxyvitamin D3, with 25-hydroxyvitamin D3 accounting for the majority of vitamin D activity in milk. The total vitamin D activity in human milk is typically around 40–50 IU/liter, with similar levels in cow's milk. The concentration of vitamin D in milk can be increased by supplementing the diet of lactating mothers or cows 169.
B Vitamins in Milk
Milk contains a variety of B vitamins, including thiamin (B1), riboflavin (B2), niacin, pantothenic acid (B5), pyridoxine (B6), biotin (B7), folic acid (B9), and vitamin B12. The levels of these vitamins can vary by region, maternal diet, and supplementation. For example, riboflavin, pantothenic acid, and pyridoxine levels were found to be lower in Vietnamese maternal milk compared to other Asian countries, while folic acid deficiency was noted in Pakistani milk samples. Vitamin B12 is present in both human and cow's milk, but its concentration and bioavailability depend on the binding proteins present in the milk and the nutritional status of the mother or animal 3478+1 MORE.
Vitamin B12 Specifics
Vitamin B12 in milk is highly bioavailable and is bound to specific proteins such as transcobalamin and haptocorrin. The amount of vitamin B12 in human milk is generally adequate if the mother is well-nourished, but can be influenced by supplementation and maternal status. Cow's milk is also a significant source of vitamin B12, and the bioavailability is generally high, especially in cow's milk compared to buffalo milk due to differences in binding proteins 47810.
Other Fat-Soluble Vitamins: A, E, and K
Milk is also a source of fat-soluble vitamins A (retinol), E (tocopherol), and K. The concentrations of these vitamins can vary by country and maternal diet. For instance, Vietnamese maternal milk was found to have higher levels of vitamins A and E, while Korean and Chinese milk had lower retinol levels, potentially leading to vitamin A deficiency in children. Vitamin K is present in milk but generally at low levels 35.
Factors Affecting Vitamin Content in Milk
The vitamin content in milk can be influenced by several factors:
- Maternal or animal diet and supplementation: Supplementation can increase the levels of certain vitamins, such as vitamin D and B vitamins, in milk 1210.
- Time of day and sampling method: Circadian rhythms and the timing of milk collection can cause small but significant differences in vitamin concentrations, with afternoon and evening samples often providing the most representative values .
- Geographical and individual variability: There are notable differences in vitamin concentrations in milk from different countries and individuals, reflecting dietary habits and nutritional status .
Conclusion
Milk is a valuable source of essential vitamins, including vitamin D, a range of B vitamins (notably B2 and B12), and fat-soluble vitamins A, E, and K. The concentrations of these vitamins can vary based on diet, supplementation, and other factors, but milk remains a key contributor to vitamin intake, especially for infants and young children 1234+6 MORE.
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