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).
Fever occurs when an area in your brain called the hypothalamus (hi-poe-THAL-uh-muhs) â also known as your body's thermostat â shifts the set point of your normal body temperature upward. When this happens, you may feel chilled and add layers of clothing or wrap up in a blanket, or you may shiver to generate more body heat, eventually resulting in an elevated body temperature.