system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What happens inside a person's body whenever a lactose relief pill is taken before consuming dairy?

Is the lactose pill countering the lactose in the dairy? Is the lactose pill just coating the stomach so the lactose in the dairy doesn't irritate it as much? 

All I know is those pills are wonderful, but think it would be really interesting to find out what is happening inside of a person's body after the pill is taken.
gpt
Lactose is a sugar. Lactase is an enzyme that digests it. People with lactose intolerance lack the lactase to digest lactose. The lactose pills and additives (such as LactAid, milk with lactase added to it) simply provide the enzyme for digestion.