For example, Consumer Reports analyzed ten brands of ginseng supplements and found that some brands contained almost no ginseng. Here's a starter list. According to the American Academy of Pediatrics Committee on Drugs, occasional or very light drinking of alcoholic beverages by the mother is not considered harmful to the breastfeeding infant. Alcohol does pass freely into mother's milk. Within 30 - 60 minutes after a drink, the alcohol is in mother's milk.
Caffeine passes readily into mother's milk.
Some mothers and babies, however, are more sensitive to the effects of caffeine than are others. Major brands of herbal teas are generally considered safe for nursing mothers and their babies. Private or little-known brands or teas made from a single herb should be viewed with caution. For example, sage is known to reduce a mother's milk supply. If a mother is regularly drinking more than a quart of herbal tea a day, or if the tea contains potent ingredients, the baby might experience side effects of the tea.