Mary Kay Lash & Brow Building Serum Review - For Lashes and Brows Eye Lash/Eye Brow Serum Updated October, 2021
Final Thoughts

Overall Score 71%

Mary Kay Lash & Brow Building Serum Review

Manufacturer’s Claim

This review examines Mary Kay Lash & Brow Building Serum, formulated by the manufacturer to improve the appearance of lashes and brows. The manufacturer claims that this Serum will enable lashes to appear more commodious and renewed and the brows will look healthier.


Amino Acids Roughly 88% of the hair is composed of the protein keratin. An adequate level of amino acids in the body leads to an optimum production of keratin which, in turn, boosts hair growth. Amino acids play a major role in the production of red blood cells that supply nutrients and oxygen to hair follicles, thus facilitating hair growth.  Red Clover extract makes hair strong by preventing dandruff and scalp irritations, it softens the hair and adds volume and luster to the hair. And makes the hair more manageable.

Mary Kay Lash & Brow Building Serum should contain 10% active ingredients with a minimum of 5 patented, clinically proven ingredients such as WideLash, Fision KeraVeg18, Regu-Fade, AnaGain, and Pentavitin to be effective.

WideLash aids eyelashes to appear longer, fuller and stronger by promoting hair bulb keratinocyte proliferation and ensuring optimal hair anchorage. It is a vegetable-based alternative to animal keratin, is a cohesive solution containing wheat & soy amino acids, with additional pure amino acids carefully selected to mimic the functional ratios in commercial human hair amino acids. Comparison studies were conducted on Fision KeraVeg18 vs. hydrolyzed animal keratin, showing this product has properties comparable to, (or in some cases), better than, hydrolyzed animal keratin. This keratin alternative protects hair from harsh salon processes, improves compatibility and reduces damage from the excessive force used against hair.

Regu-Fade a preservative-free, pesticide-free, nature identical trans-resveratrol, with extraordinary purity and safety profiles that offers multifunctional, excellent skin lightening properties for a radiant and youthful looking skin. Regu-fade visibly brightens the skin within two weeks. AnaGain can be used for stimulating hair growth and fighting hair loss. It reduces hair loss by inducing dermal papilla cells to reactivate the hair growth. AnaGain reactivates hair growth, helps the hairs to keep their original density and thickness. It has been proven, thanks to DNA microarray analysis of plucked hair follicles, to activate, in the dermal papilla, specific signal molecules which are required to initiate the growth of a new hair. Pentavitin is 100% natural and plant-derived with both Nature certification and Ecocert approval. Pentavitin does not contain any preservatives, is suitable for use in both skin and hair care applications.


The Serum should be applied as the consumer would apply a liquid eyeliner along the lash line, at night after removing makeup and contact lenses. The Serum should be applied too thinly distributed or bare areas of the eyebrows in the direction of the hair growth.


The price of this Serum is $36.00 for 15 fl. Oz. if bought online from the manufacturer’s website. This Serum may be bought online from third-party retailers as well. The manufacturer does not offer any discounted prices.


The manufacturer offers the consumer the assurance that if they are dissatisfied with the item purchased, it will be replaced without charge, exchanged or the full purchase price refunded following its return, to the manufacturer.

Mary Kay Lash & Brow Building Serum Review – The Bottom Line

This product comes with good reviews and the manufacturer gives the consumer the assurance that the product may be returned or exchanged at no additional cost. However, this product might not be effective as it should contain 10% active ingredients with a minimum of 5 patented, clinically proven ingredients. The manufacturer does not offer the consumer any discounts either, as this product seems to be in a higher price category than similar products.

Reviewed & delivered by our panel of experts at Reviewy.