S3 Clinic is a multidisciplinary medical clinic in Cascais, Portugal, focused on health, skin and longevity. Its approach brings together dermatology, aesthetic medicine and complementary medical specialties, with the aim of caring for each patient as a whole. Guided by its identity, Skin, Soul and Science, the clinic combines conventional and complementary areas of care and emphasizes personalized treatment, close patient relationships and long-term support.

Services include medical specialties and aesthetic treatments, supported by advanced medical equipment. The clinic highlights the integration of injectable procedures with technology, and states that procedures are performed or supervised by healthcare professionals. Its S3 Steps process provides a structured care journey: assessment, diagnosis, treatment planning, procedure and follow-up.

S3 Clinic also offers S3Lightness, a personalized program designed to support healthy, sustainable weight loss and metabolic wellbeing, and S3Balance, which focuses on individualized hormonal balance and wellbeing during the climacteric or other periods of hormonal deficiency. The clinic is located at Estoril Sol Residence on Avenida Marginal in Cascais.