Rayon

Rayon is simply the generic name for regenerated cellulose fiber, and viscose is the most common type, so viscose and rayon describe the same material made by dissolving wood pulp in carbon disulfide.

Because rayon is viscose, it carries the same profile. The acute danger is to workers handling carbon disulfide, which causes nerve and cardiovascular damage at occupational doses. What reaches you is residue: the chemical substances used in production can remain in the fabric and provoke allergic reactions or contact dermatitis on skin contact, and formaldehyde-based finishing agents are sometimes added for wrinkle resistance, leaving residues that irritate sensitive skin. Rayon is breathable and absorbent, so it wears cool, but unbranded or uncertified pieces are the ones most likely to carry leftover finish.

Treat rayon and viscose as identical when shopping, prefer closed-loop lyocell as the safer regenerated fiber, choose OEKO-TEX STANDARD 100 certified goods, and launder before first wear.

Standard rayon manufacturing emits toxic chemicals and contributes to deforestation pressure on endangered forests.