How long does it take for P50 to work?

-Some users instantly can tell a difference in the way their skin looks- increased glow, less breakouts, more even tone- but the sweet spot for noticeable change is typically 50 days (this I learned from the Breaking Beauty podcast, which dedicated an entire episode to Lotion P50!).

Is P50 bad for your skin?

P50 1970: the original formulation is the strongest and shouldn't be used on sensitive skin. It also contains phenol, an acid ingredient that's been banned from use in cosmetics in many countries due to its potential as a lung and skin irritant. This version is also the only one deemed unsafe for use in pregnancy.