Is The Garlic Powder You Buy At The Grocery Store A Pure Substance Or Mixture? - Tasting Table
Briefly

Garlic powder is made by dehydrating garlic cloves and then grinding them into a fine powder, retaining its raw qualities and potency while being a mixture.
Substituting garlic powder for fresh garlic is simple: use ⅛ teaspoon of garlic powder for every clove of garlic. A little goes a long way.
Read at Tasting Table
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