° Beer C et al. A clinical trial to investigate the effect of Cynatine HNS on hair and nail parameters. Scientific World Journal 2014; 2014:641723./ Complife Italia: Double blind Placebo controlled clinical study aimed at evaluating the efficacy of a foodsupplement, Cynatine® HNS, to help improve the conditions of skin, hair and nails 
°° Maia Campos et al. Oral supplementation with hydrolyzed fish cartilage improves the morphological and structural characteristics of the skin: a double-blind placebo controlled clinical study. Molecules 2021; 26:4880. 
°°° Tedesco E, Benetti F, Pezzani R. In vitro evaluation of different organic matrices used to modulate silicon bioavailability. FASEB J 2020; 34:12229–38./ Wauquier et al. An Ex Vivo Clinical Investigation for Skin Health Applications. Nutrients 2022; 14:5027./ Farcoderm 2010 evaluation of the bioavailability activity of a dietary supplement