Baking soda is a natural and inexpensive ingredient that is used for (almost) everything. It is quickly biodegradable and its price is ridiculous: from 1.95 euros to 4.45 euros at Carrefour for the 500 g package, depending on the brand.
It can replace many household products, composed of chemical elements, harmful to your health and the environment. The ingredient is also used in cooking recipes, replacing baking powder for example. Purchased in a pharmacy, it can also have a medical use - to be discussed with a health professional - to relieve aches and pains.