Ascorbyl Succinoyl Tetrapeptide-21

Ascorbyl succinoyl tetrapeptide-21 is a hybrid ingredient that combines ascorbic acid (vitamin C) with a short-chain peptide. This combination creates a more stable form of vitamin C than pure ascorbic acid, which is prone to oxidation. The ingredient functions as an antioxidant, helping to neutralise free radicals generated by environmental stressors like UV exposure and pollution.By pairing vitamin C with a tetrapeptide (a chain of four amino acids), this ingredient aims to deliver both antioxidant benefits and skin-conditioning properties. The peptide component may contribute to improved…

Antioxidant. Reduces Redness

The ascorbyl succinoyl component donates electrons to neutralise free radicals, preventing them from damaging skin cells and collagen. This antioxidant action may help reduce visible signs of oxidative stress, including dullness and uneven tone.The tetrapeptide portion works to condition and support skin barrier function. Peptides are recognised by the skin as building blocks and can signal improved firmness and elasticity. Together, the two components offer both protective and conditioning benefits in a single molecule.

This ingredient is typically found in serums and treatment products. It works well in routines alongside other antioxidants, though layering multiple vitamin C derivatives is unnecessary. Apply to clean skin before moisturiser. If your skin is sensitive or prone to irritation, introduce gradually and monitor tolerance. Vitamin C derivatives are generally better tolerated than pure ascorbic acid, but individual responses vary.

Generally well-tolerated across most skin types. As with all vitamin C derivatives, discontinue if irritation or sensitivity develops. Not recommended during pregnancy without consulting a healthcare provider. If you're pregnant or breastfeeding, please check with us first — [email protected].