Brow PeptideLENGTHEN STRENGTHEN THICKEN 0. 4 OZ Brow Peptide is a non toxic eyebrow serum and styling product. our clean formulation was created with nutrient rich peptides to promote thicker, fuller brows as it shapes and sculpts with all day hold. improves brow texture: conditions brows with keratin rich peptides to smooth coarse, brittle brows. strengthen: encourage regrowth and decrease triggers of hair loss. fuller brows: thickening serum stimulates keratin