OGX Vanilla Silk Silk Serum. This Silk Serum is a totally indulgent blend of Tahitian vanilla bean oils to instantly protect your hair with our unique nutrient infusion and hydrolyzed silk proteins. Protects, smoothes, conditions and shines your hair. Vanilla silk proteins, shea butter, and vitamins smooth, seal, and shine, conditions, and detangles dry, damaged hair, while preventing frizz and helping to prevent damage.