Once a manufacturer realizes they need to recall a product, they will send out notices by mail/email, TV commercials, news outlets, and via social media.
However, just because a manufacturer sent out a recall notice, this doesn’t absolve them of the responsilbity for injuries that occur afterward. Although consumers have a duty to discard of the effective product or food once they hear about the recall, there are many individuals who never receive the notices. That said, if you do find out about the notice and ignore it, the manufacturer will invariably argue that their liability is limited because of your failure to act on their warnings.