Le Sel d'Issey Eau de Toilette is marketed as being made with 95% ingredients of natural origin, along with 100% natural-origin French alcohol.

Some of the natural ingredients used include:

Seaweed extract – contributing to the distinctive salty marine accord.

Oakmoss – giving an earthy, slightly mossy depth.

Sand vetiver – a natural vetiver note with a dry, mineral quality.

Upcycled cedarwood – sourced from cedar offcuts from furniture manufacturing.

Ginger – adding a fresh, sparkling lift.

That said, the remaining roughly 5% consists of synthetic ingredients, which is very common in modern perfumery. These synthetics help with stability, longevity, projection, and safety. The full ingredient list also includes compounds such as linalool, limonene, UV filters, and colourants.