From "A Consumer's Dictionary of Food Additives" by Ruth Winters, M.S.
Copyright 1994. A book I highly recommend:

Lactic Acid: Butyl Lactate. Ethyl Lactate.... present in blood and muscle
tissue as a product of the metabolism of glucose and glycogen... It is
produced commercially by fermentation of whey, cornstarch, potatoes, and
molasses....

Lactic Yeasts: Obtained from milk. See Lactic Acid.

Lactose: Milk Sugar. ... Produced from whey... widely used in the food
industry as a culture medium... Also used as a medical diuretic and
laxative. Used widely as a base in eye lotions...

Those are the only "Lac-" ingredients listed in this volume with a specific
source being milk. Other "Lac-"s are listed but do not list a source.

The descriptions are much more comprehensive than shown above and include
information on what sorts of products you are likely to find these in.
--
Linda Blanchard
Midland, Texas, USA
http://www.nowheat.com  (and no milk, too!)