AICAR (5-aminoimidazole-4-carboxamide-1-β-D-ribofuranoside) is a substance produced naturally by the body that stimulates AMP activated protein kinase (AMPK), a protein that regulates metabolism in a variety of ways. AMPK acts as an energy regulator and is activated during exercise or other circumstances that use up cellular energy.
Once activated by AICAR, AMPK works to make energy more available. For example, it increases the usage of fat for energy and causes cells to make more mitochondria (the cells’ powerhouses or energy creators). AMPK basically ensures that the various tissues in the body don’t run out of energy.
There are many circumstances that activate AMPK naturally, including hypoxia (low oxygen levels during exercise or at elevation), hypoglycemia (low blood sugar with exercise or fasting), the use of cellular energy during muscle contraction, and anything that disrupts energy creation within cells.
