Sodium PCA-Nalidone

This is the sodium salt of a naturally occurring amino acid compound and an important component of the skin’s natural moisturising factor. It is manufactured using a clean, controlled process and used in cosmetics as a highly effective humectant. It is water-soluble and fits naturally into formulations that mimic the way a healthy outer skin layer retains moisture.

Sodium PCA attracts and retains water in the outer layer of the skin, helping to reduce roughness, flaking and tightness. It supports the suppleness of surface skin cells and improves comfort without leaving a greasy film. It is not an exfoliating acid, although the abbreviation PCA may sound technical. It works mainly as part of a moisturising system and combines well with amino acids, lactate, betaine, glycerine and hyaluronic acid.

It is particularly beneficial for dry, dehydrated, mature and sensitive skin. Its lightweight, water-based nature also makes it suitable for oily and acne-prone skin that needs to restore hydration without clogging pores. It is useful in products applied after cleansing, toners, serums, creams and treatments for dry hands or body.

A comparative study of moisturising ingredients on Asian skin showed that 1 per cent Sodium PCA increased hydration by more than 25 per cent compared with an untreated area and a placebo during the first three hours after application (Cosmetics and Toiletries, 2005). This result confirms its rapid humectant effect, rather than a long-term replacement for the lipid barrier.

Typical use levels range from around 0,2 to 5 per cent, depending on the product type. At high concentrations, it can increase stickiness, so it is combined with emollients and film-forming ingredients. It is generally very well tolerated, although the final feel depends on the formulation as a whole.

In your daily routine, it is worth assessing longer-term comfort and suppleness in particular, as well as whether your skin feels less tight during the day. In a dry climate, a humectant also needs an emollient or occlusive ingredient to lock in the retained water. The result therefore depends on the whole formulation, regular use and gentle cleansing, rather than simply a high concentration of one ingredient. Regular application in appropriate amounts is also important.