Optimal doses of barley as a food or supplement have not been established for any condition. However, to try to lower cholesterol, people have used one of these daily doses: 1  3 grams of barley oil extract. 2  30 grams of barley bran flour.
Still, the very best way to raise your body temperature is to go for a light jog - just get your heart pumping. Jogging/running is one of the easiest ways to get your heart pumping in a short amount of time and works throughout your whole body (as opposed to the heat pad).
A fever occurs when the body increases in temperature. Most common cause of this is an infection of some kind. The White blood cells that eat the infection, release chemicals that go to the brain and tell it to raise the temperature of the body. The brain has a set point for our temperature, 98.6F.