A-B-C-D-E-F-G-H-I-K-L-M-N-O-P-R-S-T-U-V-Z

Sebum
Matter produced by the sebaceous glands linked to a piliary follicle and which naturally lubricates both the hair and the body hair.
Selenium 
Trace element with strong antioxidant properties, it is very effective in the fight against ageing.
Serotonin
Cerebral neurotransmittor which regulates food intake and has a positive effect on mood.
Sulfured amino acids
These acids, methionine and cysteine, form part of the Essential Amino Acids. They have the characteristic of containing at least 1 atom of sulfur, which allows them to form disulfur bridge that are chemically stable between different molecules.
Sunburn cells
Cells that have been subject to the harmful effects of the sun.
Suntan
This takes place as a result of the synthesis of melanine – a natural pigment in the skin - which provides an active defence mechanism during sun exposure.