Palmitoyl Tripeptide-5 – produces new collagen to improve wrinkles and strengthen the dermis. Revision Hydrating Serum, Nectifirm by Revision.

Panthenol (Vitamin B5) – humectant moisturizer (attracts water), tissue repair, wound healing.
SkinCeuticals.

Persea Gratissima (see Avocado Oil)

Phloretin – from apples and root bark of fruit trees, anti-inflammatory, antifungal, and anticancer, improves cell turnover, slows degradation of collagen, increases elastin, inhibits sun-induced pigment formation/tanning. SkinCeuticals.

Phytosphingosine – improves skin barrier and function, and skin moisture. SkinCeuticals.

Plantain (Plantago Major) – relieves pain, itch, infection of skin.

Polyporus Umbellatus (Mushroom) Extract – contains kojic acid which inhibits tyrosinase enzymes that produce skin pigment. In skin lighteners. Antibacterial. iS Clinical.

Proxylane – increases elastin, collagen and thickness of dermis, improves hydration. SkinCeuticals.

PSP – (Processed Skin Proteins) contains proteins and polypeptides, human growth factors and cytokines – for wrinkle improvement, in Neocutis line.