Researched by Helena DeMaria-Williams
Formula IngredientHumectantSodium Caproyl Prolinate
INCI: Sodium Caproyl Prolinate
Sodium caproyl prolinate is an amino acid-derived humectant made from L-proline (a naturally occurring amino acid) and a short-chain fatty acid (capric/decanoic acid). It works by binding water molecules to the skin, improving moisture retention, and additionally functions as a penetration enhancer — helping other active ingredients such as niacinamide, zinc PCA, and amino acids absorb more effectively. It also acts as a mild antimicrobial booster, supporting preservative systems in formulations.
Category
Humectant
Irritation Risk
Low
Skin Types
all skin types, dry, dehydrated, sensitive, oily, combination, anti-ageing concerns
What does this do in a formula?
hydration, moisture retention, penetration enhancement of actives, antimicrobial boosting, skin conditioning, hair conditioning
Is Sodium Caproyl Prolinate safe? Key considerations
Can Sodium Caproyl Prolinate cause irritation?
Low RiskSodium caproyl prolinate is an amino acid salt with no known irritation concerns at typical cosmetic use concentrations. It is not listed under EU CosIng Annex II (prohibited) or Annex III (restricted) substances. The ingredient has a 'no penalty' rating across all safety categories in cosmetic ingredient databases. It is considered well-tolerated by all skin types.
Does Sodium Caproyl Prolinate increase sun sensitivity?
No RiskSodium caproyl prolinate does not have photosensitising properties. It is not an exfoliant, retinoid, or UV-absorbing compound, and no special sun protection precautions are required based on its presence in a formulation.
Is Sodium Caproyl Prolinate safe during pregnancy?
CautionMANUAL REVIEW: No specific pregnancy safety data exists for sodium caproyl prolinate in MotherToBaby, EWG, or major toxicological databases. As an amino acid-derived ingredient with low systemic absorption, it is unlikely to pose significant risk at cosmetic concentrations; however, the absence of dedicated safety studies means 'Caution' is assigned pending further review. Pregnant individuals should consult a healthcare provider if concerned.
How does Sodium Caproyl Prolinate work?
Sodium caproyl prolinate is an amino acid-derived humectant made from L-proline (a naturally occurring amino acid) and a short-chain fatty acid (capric/decanoic acid). It works by binding water molecules to the skin, improving moisture retention, and additionally functions as a penetration enhancer — helping other active ingredients such as niacinamide, zinc PCA, and amino acids absorb more effectively. It also acts as a mild antimicrobial booster, supporting preservative systems in formulations.
Which products contain Sodium Caproyl Prolinate?
Shop products that contain Sodium Caproyl Prolinate
