Sodium carbonate (also known as washing soda, soda ash and soda crystals), Na 2 CO 3, is the water-soluble sodium salt of carbonic acid.
7. Improves Skin Function. Niacin helps protect skin cells from sun damage, whether it's used orally or applied to the skin in lotions . And recent research suggests it may help prevent some types of skin cancer . A 2015 study found that taking 500 mg of nicotinamide (a form of niacin) twice daily reduced rates of non-melanoma skin cancer among people at a high risk of skin cancer .
Common side effects of niacin include flushing, itching, and gastrointestinal disturbances, such as nausea and vomiting. Hepatotoxicity (liver cell damage), including elevated liver enzymes and jaundice, has been observed at intakes as low as 750 mg of niacin per day for less than three months (84, 85).