There are two possible stories behind the all-day pills.

One is an acidophilus pill call DairyCare, which its creator 
claims will work against lactose all day long, after an 
initial two-week break-in period. I've had mostly good 
feedback on it. Check my web site at;
http://ourworld.compuserve.com/homepages/stevecarper/dcare.htm

An article in Maclean's magazine talked about a pill to "cure" 
lactose intolerance, based on experiments on rats. The "pill" is 
a genetically modified virus that puts an active lactase gene into 
the intestine where it can manufacture the lactase we lack. This 
"cure" is at least ten years away, assuming it ever works at all. 
More info on my web site at:
http://ourworld.compuserve.com/homepages/stevecarper/li_cure2.htm

Steve Carper