How long can you use horlicks after sell by date?

Well, honey, technically you can use Horlicks after the sell-by date as long as it looks and smells okay. The sell-by date is just a suggestion for peak quality, not a magical expiration date. So, if it's not growing mold or smelling funky, go ahead and mix it up - you might just be fine. But hey, use your best judgment and don't come crying to me if you end up with a bad case of the runs.