India, March 20 -- For most of us, buying sunscreen is a quick decision. We scan the label for a high SPF, maybe glance at whether it's matte or gel-based, and toss it into the cart. But lately, another phrase has started appearing on sunscreen packaging and skincare campaigns: "in-vivo tested."

If you've noticed the term and wondered whether it's just another marketing buzzword, you're not alone. The phrase has been gaining traction across the beauty industry, largely because consumers are asking more questions about the science behind sunscreen claims. And according to dermatologists, it's actually a meaningful detail, though not the only one that matters.

To break down the science behind the term and what it means for consumers, we s...