The LASH and BROW ingredients are the same, except for the BROW serum has a slightly higher concentration of one active ingredient. This is because the brows respond better to a more robust formula. The eye area is naturally more sensitive. So, our formula for the LASH serum is perfectly blended for results without exacerbating individual sensitivities. Additionally, the BROW applicator is a spoolie brush. This allows you to brush the serum on the brow line in one fell swoop — and then, gently rub the product back and forth on the skin where hair growth is desire. The invigoration helps bring blood flow to the area and delivers superior results. The LASH applicator is an eyeliner-style brush so that you can apply a line at the base of the upper eyelashes (inside to outside) with precision and without wasting product. The HAIR formula is an elegant serum with the same clinically evaluated ingredients found in the LASH and BROW serums. We blended in three key additions, Hyaluronic Acid (HA), Provitamin B5, and Rubus Fruticosus (Blackberry) Leaf Extract. HA acts as a cushion to promote collagen and elasticity and is a super magnet for moisture. Pantothenic acid prevents moisture loss, deeply penetrating the hair and helping to nourish the scalp. The blackberry leaf extract has been found to stimulate elastin synthesis by increasing the elastin gene transcription and increasing tropoelastin. Our version supports the prevention from solar elastosis. We use naturally derived, naturally sourced ingredients. All formulas are paraben-free, top allergen-free, clinically evaluated, vegan friendly, gluten-free, and proven safe.