By Dr. Liji Thomas, MD Reviewed by Lauren Hardaker Mar 5 2026 As probiotic skincare products claim benefits ranging from anti-aging to mood enhancement, researchers reviewed the scientific evidence and found that while some probiotic strains affect mental health when consumed, there is currently no proof that applying them to the skin can influence emotional well-being. Study: Neurocosmetics or Hype? Psychobiotic Potential of Strain-Specific Cosmeceuticals . Image credit: polinaloves/