Lactic acid levels get higher when strenuous exercise heart failure, infection or shock lower, flow of blood and oxygen through out body. Lactic Acid is an alpha hydroxyl acid it is exfoliates skin. Lactic acid is produced in muscle cells and red blood cells. It forms when body breaks down carbohydrates to use for energy, oxygen levels are low. Lactic Acid should not used on sensitive, peeling or compromised skin. Lactic acid is an anti-wrinkle and pigmentation-fighting ingredient.