Is it really necessary to dissolve active dry yeast before using it in bread? Inquiring bread bakers want to know! You may have heard over the past year or so that active dry yeast (ADY) has been reformulated into a smaller particle size, and can now be used without dissolving it first – as had always been the requirement. Note: Dissolving yeast and proofing yeast are two distinct processes. First we'll cover dissolving; see the end of this post for information on when to proof yeast.