The Ultimate Guide to SPF: Key Facts, Common Mistakes, and How to Avoid Them

The Ultimate SPF Guide (2025): What Works, What Doesn’t, and How to Use It Right If there’s one skincare habit that outperforms fancy serums and trends, it’s sunscreen. This SPF guide covers what SPF actually measures, the difference between UVA and UVB, how to choose your formula, how much to apply, how to reapply (yes, […]