What is an actual fat burner supplement that i can buy from walgreens cvs or walmart that actually helps to burn fat - belly fat?

Avoid "fat burners": Our bodies like to use glucose (our main fuel), which comes from the food in the stomach and small intestine, and from the liver (where glucose is stored in a starch form called glycogen). As long as one is NOT eating enough to supply glucose to his cells, his liver will run low on glucose/glycogen, and his body will burn fuels like fat to keep his cells working. Eat less and exercise more.