At some point, you will need more ingredients to make better products for your clients! Thanks to the suppliers, you will be able to receive them with the regularity that you choose! You will be able to manage this by tapping on the Suppliers section of your restaurant.  

As long as you drag the bar, you will be able to check how much of that specific ingredient the suppliers are bringing, and the time left.

*NOTE: f you still don't have the supplier available in your game, don't worry! This option will appear further in the game :)