Many brands now include a QR code on the package that you can scan with your phone. It should take you to the official product page or a verification page. But here's the catch: counterfeiters can copy QR codes too. So don't rely on it alone. If the code leads to a weird website or a page that doesn't look official, that's a bad sign.

You can also look up the brand's website and see if they have a way to verify the product. Some brands let you enter the batch code online. If the brand doesn't offer this, you can still contact them directly with the batch number to ask if it's legit.