What it is: BioSilk Thickening Conditioner contains Vitamin B and Wheat Proteins which are gently infused into the hair cuticle adding fullness and thickness to each strand of hair. What it does: Silk proteins penetrate hair to condition and create incredible shine. What else you need to know: UV filters protect hair from damaging UVA/UVB rays with the Ideal for thinning hair. Product Options Available are as follows: Size : 12 oz - Biosilk Thickening Conditioner;.