Breast niacin

Lactation Niacin is actively excreted in breast milk. 

Human breast milk provides far too little phosphorus, iron, vitamin D, vitamin E, thiamin, and vitamin B-6 and is low in calories, protein, calcium, riboflavin, niacin, and pantothenic acid. Hence, reliance solely on this food for the feeding of infants aged 6 months and older is likely to result... 

MINERAL AND VITAMIN SUPPLEMENTS. There is considerable controversy among nutritionists and pediatricians regarding the amounts and types of nutrient supplements that are required by infants, since breast-fed infants have long been given little or no supplementation. Furthermore, the need for supplementation depends upon a variety of factors such as (1) status of the infant at birth, since preterm or low birth weight infants have higher nutritional requirements to attain the rates of growth and development of normal infants (2) type of milk or formula used (3) affliction of the infant with diarrhea, fever, infection, and/or other stresses and (4) age at which supplemental foods are introduced. It is noteworthy that even breast milk is low in iron, copper, fluoride, vitamins A, D, and E, and biotin, folacin, niacin, thiamin, and vitamin B-6. Furthermore, diluted evaporated milk is notably inferior to breast milk with respect to the contents of iron, zinc, vitamin A, vitamin E, and vitamin C. Therefore, the need for nutrient supplements should be evaluated by a health professional who is familiar with the diet and the overall health status of the infant. 

The average content of niacin in human breast milk is 8 mg (65.6 pmol) per 1000 kcal (4200 kJ), and this is the basis for the recommendations (and dietary reference values) for infants up to 6 months. In the UK, the Reference Nutrient Intake niacin increment during pregnancy is nil, and during lactation it is 2 mg per day. 

---