LA BIOSTHETIQUE Structure Restoring Treatment RT (Spray 50ml + Mask 100ml)

This is a repair course rather than a weekly mask — two products used back to back in one wash, aimed at hair that has been through bleach, permanent colour or repeated chemical work and has started to feel rough and fragile through the lengths.

The actives

• Cysteine, in the spray — a natural amino acid that traps damaging components of chemical treatments and helps create new sulphur bonds.
• Magnesium mineral salt, in the spray — strengthens and stabilises the hair by cross-linking salt bonds.
• Keratin and wheat protein, in the spray — rebuild and fortify the fibre against breakage.
• Camellia and argan oil, in the mask — strengthen the structure and moisturise without weighing hair down.
• Wheat germ extract and sugar beet copolymer, in the mask — preserve colour vibrancy and smooth the hair surface.
• Ceramides, in the mask — mend compromised areas along the hair shaft.

Worth knowing

The spray works inside the fibre and the mask works on the surface, which is why the order matters and why neither is sold as a standalone fix here. Dose by hair length rather than by feel — under-dosing a repair treatment is the usual reason it seems not to have worked.