Baking soda, or Sodium bicarbonate, is a substance which finds multiple applications among Manosphere readers. Roosh V even claims that it changed his life. RVF member Moma "feels like MacGyver" using it because of the many possible applications.
While baking soda is capable of much more, these are the most popular usages.
Applying a tiny amount of it into the wet armpits after showering will prevent them from smelling for up to 24 hours.
Instead of using traditional shampoo it is recommended to apply baking soda on the scalp once a week to help clean out any major impurities and grease chunks. The other six days one should only use water.
Baking soda can be used as a simple toothpaste, but can also (according to the major toothpaste companies, which have a financial vested in interest in the matter) can supposedly break down the enamel. Baking soda can also be messy and gritty compared to packaged toothpaste.