hiya for some reason it's best to use your sins daily , unfortunately you cannot save them up hope that helps although you don't have to use the 15 but the rest cannot be savedim new to slimming world but does everyone use their syns everyday as iv been doing it for 3 days now and have hardly used any syns as im full and I don't really pick at things? can I save them up for the weekend as im out? but in general isit best to use 15 a day? sounds strange that I find it hard to use syns I thought I would use them easily! thanks in advance! any advice is greatly appreciated!