Its special protein complex is formulated with keratin and is indicated for the treatment of alopecia problems and the care of weakened hair. Properties. Keratin is an albuminoid protein that has the property of fixing on the hair cuticle (exterior protection of the hair) where it may be most damaged. Mode of use. Apply to wet hair, massage the hair dermis until foam appears. Clarify. Repeat the operation, leaving it exposed for 1 minute. Rinse completely. Frequent use.