Our Ingredient Library


Every Kate Somerville ingredient is tested for safety and maximum effectiveness. Come meet the active ingredients that will deliver the visible results you deserve.



Ectoin is a 100% natural Amino Acid derivative that deeply soothes + hydrates while protecting against environmental damage to keep the skin’s barrier healthy.

Glycolic Acid

Glycolic acid is an AHA (alpha hydroxy acid). Made from sugar cane, its tiny molecules penetrate skin easily to stimulate collagen + dissolve the top layer of dead cells.

Hyaluronic Acid

The largest naturally-occurring humectant in the skin, hyaluronic acid hydrates skin cells by pulling in and retaining a high volume of water.

Lactic Acid

Lactic acid is an alpha hydroxy acid (AHA). It doesn't penetrate pores as deeply as other acids, making this exfoliator ideal for surface texture issues like firmness, hyperpigmentation + dark spots.


A form of vitamin B3, niacinamide improves skin's natural barrier by boosting ceramide production + increasing cell turnover.


Peptides are short-chain amino acids. As we age, our natural production of essential proteins like collagen, elastin, and keratin declines. Peptides tell those skin cells to rebuild and repair, while mending the skin barrier + locking in moisture.


Retinol is a form of vitamin A. This potent over-the-counter exfoliator increases cell turnover, unclogs pores + helps regain elasticity.

Salicylic Acid

Salicylic acid is a BHA (beta hydroxy acid). It breaks down bonded skin cells to balance sebum production, unclog pores + remove dead skin.


Full of natural antioxidant properties, squalane builds and strengthens skin's natural moisture barrier to lock in hydration at the cellular level.


Sulfur removes dead skin by drying it out and allowing it to easily slough away. This keeps pores clear and allows fresh new layers of skin to grow in its place. It also has antibacterial properties, combating bacteria that lead to acne + other forms of skin irritation.

Vitamin C

Vitamin C replenishes natural lipids, restores healthy skin barrier function, aids in collagen production + neutralizes free radicals.

Zinc Oxide

Zinc Oxide is a mineral compound derived from Zinc. Known for its skin-soothing + UVA/UVB-shielding properties, it’s commonly used in skincare products, particularly sunscreens.