Biologique Recherche P50 vs Oumere No. 9: my honest review after years of acids. From phenol burn, smell, and acne fixes to how my skin reacted long-term. Was the sting progress or addiction? Full breakdown inside. Worth the hype? Read before you buy. https://www.reddit.com/r/40PlusSkinCare/comments/1q4qyo8/biologique_recherche_vs_oumere_no_9_my_honest/