Sodium bicarbonate
From PyroGuide
Formula: NaHCO3
Synonyms: Baking soda, cooking soda, bicarb soda, sodium hydrogencarbonate, or bicarbonate of soda
Description: Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. Sodium bicarbonate is used as baking soda to lower the acidity of foods and give dough a darker color when cooked. Sodium bicarbonate is also widely used for a deodorizer and as a cleaning agent used for scrubbing and toothpaste. In pyrotechnics, sodium bicarbonate is used for some yellow compositions, as a delay agent in glitters, and as a burn rate modifier.
Hazards: There is very little to no hazard when in contact with baking soda. As long as not to much is consumed it's harmless.
Sources: It is sold in many shops for baking, as baking soda or bicarbonate of soda. It can also be used to make Na2CO3 very easily by heating it above 70 degrees Celsius (~160 degrees Fahrenheit).