Aluminum Content in Baking Soda
From my reading, it looks like the idea that aluminum is in common baking soda is untrue.
Arm & Hammer site emphatically claims to have no aluminum in its baking soda.
From what I’ve read, it is unlikely any baking soda you can buy has aluminum in it.
Unlike baking soda, baking powder may contain aluminum in it, however you can buy it without or make your own. According to David Lebovitz’s website : 1 teaspoon of baking powder, mix 1/2 teaspoon cream of tartar with 1/4 teaspoon of baking soda and 1/4 teaspoon cornstarch.
I don’t use any baking powder in my products.