More is better, Right? intuitively, a higher number may seem more effective, but with sunscreen, it's not that simple. This is a very common question since there are so many sunscreen options out there. How do you know which one to pick?? SPF50? SPF100? or more number? SPF30 is enough, If you are using it correctly. SPF30 blocks 97% of UVB from your skin when applied at a density of 2 mg/cm2(approx. 1 shot full of sunscreen for your whole body). When used correctly, SPF30 sunscreen is sufficient to protect your skin from UVB rays & the burning & damage that leads to skin cancer. But i bet you are not putting enough on, You're not alone. Most people don't put on enough sunscreen, usually about 30% of the required density, which means you are getting about SPF-10. This isn't enough to protect you from sunburns or skin cancer.
