Baking powder is a leavening agent that contains baking soda plus an acid, so it makes cakes, muffins, biscuits and pancakes rise with only moisture and heat. Most baking powder sold today is double acting, releasing gas once when mixed and again in the oven, which gives bakers some time before the batter goes in. The first decision is whether a recipe calls for baking powder, baking soda or both, because they are not interchangeable.
Aluminium free baking powder is the next choice. Some powders use an aluminium based acid that can leave a slight metallic taste in some recipes, while aluminium free versions avoid it. European recipes sometimes use single sachets of baking powder sized for one cake, which is why some packs here come in small envelopes.
Freshness matters a lot. Baking powder loses strength over time and in humid kitchens. Test it by adding a spoonful to hot water: lively bubbling means it is still active. A tightly closed lid and a cool, dry cupboard extend its life.
Size and container come next. Among the 7 products that list size, most fall between 0.3 and 4.5 pounds, and 0.8 pounds is typical. Small cans suit home bakers who use it occasionally, while large tubs suit frequent baking and bakeries. Buy a size you will use before it loses strength.
Before buying, check whether the powder is double acting, whether it contains aluminium, the size, the container, and the date on the pack. Some brands are labelled vegan or gluten free, which matters for strict diets where cross contact is a concern. If a recipe rises poorly, an old can of baking powder is often the cause, so replace it every several months if you bake rarely, and write the opening date on the lid.
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