Esthederm Sérum Intensif Spiruline is a regenerating serum for stressed skins. Spirulina, or blue gold, is an algae with nutritional, revitalizing and regenerating properties. Esthederm has created an intensive serum based on spirulina to assure new life and tone to tired skins. Benefits are visible after few applications and your skin looks more firm and elastic. How to use: Apply in combination with Intensive Spiruline cream, morning and / or evening on face, neck and décolleté. If applied by itself, this treatment is ideal for men, oily skins or in summer. For an ideal result, use the serum for a 2-month treatment.