Explain the effect on Vitamins of the human milk?

Although there are inter-individual variations in vitamin concentrations, diet and drug use by individual women influences vitamin composition in human milk. Vitamin D activity of human milk is influenced by maternal vitamin D intake, as well as, maternal exposure to UV light. Concentration of vitamin A is strongly influenced by the mother's diet. Vitamin A content of breast milk has been found to be much lower in some developing countries than in Western countries.

The levels of water-soluble vitamins are more likely to reflect maternal dietary or supplement intake than most other ingested compounds. In lactating women of low socio-economic status, supplementation with folate, vitamin B₁₂ and B₆ increased the levels of each vitamin in milk. B6 in milk may be a sensitive indicator of maternal vitamin B₆ status. There are reports of vitamin B₁₂ deficiency in infants of vegan and malnourished mothers. So far, we have dealt with the various aspects of lactation and the importance of maternal nutrition for ensuring infant well-being. Let us now examine the impact of lactation from the mother's perspective.