- Wrinkle Prevention : Vitamin B5 replenishes the skin’s natural barrier against the loss of moisture.|Wrinkle Repair : Vitamin B5 actively hydrates your skin by drawing moisture from the atmosphere.|It’s D-Panthenol : Only D-Panthenol is converted to Vitamin B5 and not the L-Panthenol.|Please note that all serums can sometimes create irritations for people with very sensitive skin or uncommon allergies. |Always test the product on a small area before using it ideally behind an ear or under the chin. |Allow 24 hours to measure skin sensitivity to the product.