Want to know more about what's inside our products?

Dive into the Science Behind St. Croix: Uncover the meticulously chosen ingredients that power our formulations, the cutting-edge technologies that enhance their efficacy, and the dedication we invest in bringing you skincare that harmonizes science and beauty.

Our Favorite Peptides

  • Idealift™ - Lifting

  • Matrixyl 3000™ - Wrinkles

  • SYN®-TC - Collagen

  • Uplevity™ - Firming

  • Regestril™ - Stretch Marks

  • GHK-Cu - Repair

Acetyl Dipeptide-1 Cetyl Ester

Fights against skin sagging and improves resistance to gravity. It not only stimulates elastin synthesis but also promotes a correct and functional elastic fibre architecture by inducing the most important elements involved in tissue structure.

More Info

Palmitoyl Tripeptide-1 (and) Palmitoyl Tetrapeptide-7

A synergy of two matrikines, Pal-GHK and Pal-GQPR, that repair the cutaneous damages of age. This product is used in anti-wrinkle applications. It contains matrikines which are messengers of cutaneous restructuration and repair. They activate the neosynthesis of extracellular matrix macromecules providing this product with a visible anti-wrinkle efficacy.

More Info

Palmitoyl Tripeptide-5 (and) Palmitoyl Dipeptide-5 Diaminobutyroyl Hydroxythreonine

A cosmetic peptide, tailor-made to ensure best performance for high-performing, facial anti-ageing formulas. This product significantly increases the formation of Collagen I, III, IV, VII and XVII – helping to make beautiful, smooth skin. In fact, a comprehensive consumer study confirmed they experienced a new dimension in skin smoothing. In just 28 days at a usage level of 2.5%, skin became smoother with a softer touch and an improved overall young-looking appearance.

More Info

Acetyl Tetrapeptide-2

Designed to fight the undesired effects of a lack of skin firmness and cohesion by enhancing the natural elements that help to maintain collagen levels and elastin fibres correctly assembled, and facilitating the union between cells and the ECM by acting on focal adhesions.

More Info

Palmitoyl Tripeptide-1 (and) Palmitoyl Tetrapeptide-7 (and) Phaseolus Lunatus (Green Bean) Seed Extract

Effectively prevents and reduces stretch marks by slowing down the degradation and by promoting regeneration of the extracellular matrix. Shows a visible and significant anti-stretch mark efficacy.

After 2 months use, stretch marks fade, skin becomes smoother, and their depth can be reduced by up to 72%.

More Info

Copper Tripeptide-1

GHK-Cu exhibits a broad range of anti-aging, reparative, and protective actions. It can increase production of key skin proteins such as collagen as well as other important components of dermal matrix. GHK-Cu modulates the skin remodeling process, being able to stimulate both breakdown and synthesis of dermal matrix components. It repairs and remodels skin, anti-wrinkle, anti-aging, firm skin.

More Info