Ay, good question kasi maraming fake ngayon! I usually check the packaging mabuti, authentic Cetaphil has clear, crisp printing, walang typos, at ang barcodes are legit when you scan. Best is bumili from trusted stores like Watson's, Mercury Drug, or Watsons online para sigurado ka na original, kasi ang dami ng counterfeit sa malls ngayon talaga. A few of us mums nag-invest na lang sa official channels kaya walang hassle, lalo na pang-baby sensitive skin mo.