Mary Kay Lash & Brow Building Serum®

.15 fl. oz.


Improves the overall appearance of lashes, leaves brows looking healthier. See results in just 30 days.

  • Lashes seem more voluminous.
  • Lashes look maximized
  • Brows look healthier.

All prices are suggested retail.

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  • Overview
  • Application Tips
  • Key Ingredients
  • Claims and Benefits

Mary Kay Lash & Brow Building Serum®

Turn lash envy into lashes that look fuller, look thicker, look maximized. Turn problem brows into the healthy, natural-looking brows you want. All it takes is just seconds a night – and in just 30 days you’ll see the results that women everywhere are already talking about.

Mary Kay Lash & Brow Building Serum® is formulated to help lashes and brows live up to their fullest potential. Lashes appear more voluminous and look renewed, and brows look healthier. This gentle, fast-drying serum is powered by our Lash Response™ Complex, an essential nutrient boost of amino acids, a peptide and red clover extract. The appearance of lashes and brows is improved.

Application Tips

  • Apply at night after removing makeup and contact lenses.
  • Apply as you would a liquid eyeliner along the lashline.
  • Apply the formula to sparse or bare areas of the eyebrows in the direction of hair growth.

Key Ingredients

This gentle, safe, non-drug formula contains the revitalizing Lash Response™ Complex that contains:

Amino Acids help provide essential nourishment.
Red Clover extract. Red clover is a botanical known to contain antioxidants that help neutralize free radicals.

Claims and Benefits

7 out of 10 Women Said Lashes Appeared Fuller*.

Here’s what else women told us after using Mary Kay Lash & Brow Building Serum® once a day for one month during an independent study*:

77% said it reduced lash brittleness and breakage
76% said the look of lashes was improved
65% said the look of brows was improved

*Study conducted by an independent research company during which 196 lash panelists and 95 brow panelists applied the product once a night for one month.