Which sunscreen SPF offers a negligible increase in UV protection compared to SPF 50?

The choice of SPF 75 offers a negligible increase in UV protection compared to SPF 50 due to the diminishing returns associated with higher SPF values. The SPF rating indicates the level of protection against UVB radiation, with higher SPF values providing slightly more protection. However, the difference in actual UV protection becomes minimal as the SPF increases.

For instance, SPF 50 blocks approximately 98% of UVB rays, while SPF 75 may only block around 98.6% of UVB rays. This small incremental increase means that the additional protection gained by moving from SPF 50 to SPF 75 is minimal, making SPF 75's increase in UV protection negligible.

While lower SPFs like 30 also provide good protection, the increase from those levels to SPF 50 shows a more significant difference in UVB protection than moving from SPF 50 to SPF 75. This principle of diminishing returns is important in understanding how SPF works and why, after a certain point, increasing SPF does not significantly enhance protection.