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Thrive Causemetics

Liquid Lash™ Extensions Lash Serum

Purchase Frequency

Get longer- and fuller-looking lashes in 8 weeks with our peptide-powered, revolutionary vegan lash serum. Need more assistance? Let's Chat!

We think you will love our serum, but if you don't, no worries! Enjoy easy returns with our return + exchange process.

What Makes It Different
  • Limitless Length Volumizer™ promotes the appearance of healthier-, fuller-, and longer-looking lashes after consistent use in just 8 weeks.

  • Our transformative lash serum is ophthalmologist-tested and made without ingredients known to cause irritation or be harmful during pregnancy.*

*consult physician before use while pregnant.

How to Use

  • Peptide-powered and loaded with biotin and sodium hyaluronate, our lash serum conditions and hydrates for healthy-looking lashes and lids. More Key Ingredients Below

  • 100% vegan + cruelty-free! Our high-performance products are always formulated without parabens, phthalates, sulfates and synthetic fragrance.

Full Ingredients List

Karissa's Pro Tip

For best results, apply to the skin closest to the lashes (the lash root), not the actual lashes. One dip into the bottle is enough serum for both eyes.

bigger than beauty® giving mission

For every product purchased, we donate to help communities thrive.

Learn More

Real Results

In a consumer perception study of 32 subjects aged 21-68.


agree lash serum is easy to use, the thin brush applicator allows for easy, precise application, and they did not experience any irritation.


agree their lashes look healthier as well as looking longer and more voluminous when mascara is applied after using this lash serum for 8 weeks.


agree that they experience less lash loss during makeup removal after using this lash serum for 8 weeks.


see noticeable results in the volume of their lashes after using this lash serum for 10 weeks.


agree this lash serum improved the overall look of their lashes after 8 weeks of use.


see noticeable results in the length of their lashes after using this lash serum for 8 weeks.


agree that their lashes look denser after using this lash serum for 8 weeks.


  • What Else You Need to Know

    Gentle yet effective, this high-performance formula provides transformative results with lash-loving ingredients. Our vegan lash serum promotes longer- and fuller-looking lashes while conditioning and hydrating the eye area to help prevent irritation to skin. Liquid Lash™ Extensions Lash Serum is dermatologist-, ophthalmologist-, and allergy-tested and formulated with sensitive skin in mind. If you have known allergies or sensitivities, we recommend consulting the full ingredient list or performing a patch test.

    • Paraben-Free
    • Sulfate-Free
    • Formulated without Phthalates
    • Vegan
    • Cruelty-Free
    • No Synthetic Fragrance

  • 0.10 fl oz / 3 mL

  • Made in the USA of global ingredients

Image: Ingredients | Lash Serum


  • Power 5-Peptide Blend

    A unique blend of 5 powerful peptides visibly improves eyelash volume by conditioning the lashes to provide healthier-, longer-, fuller-, and stronger-looking lashes.

  • Biotin

    Also known as Vitamin B7, Biotin improves the quality of keratin structures in hair to have a positive effect on fine and brittle hair.

  • Sodium Hyaluronate

    Holds 1,000 times its weight in water to hydrate and replenish moisture on the skin and eyelashes, ensuring lashes are conditioned and helps prevent irritation.

  • Amino Acid Blend

    Amino acid blend moisturizes and helps to nourish for healthier lashes while strengthening hair.

  • Organic Pea Sprout Extract

    Helps the eyelashes to keep their density and thickness by helping to improve hair’s vitality.

Frequently Asked Questions

    • How often do I need to apply the serum?

      You only need to apply once per day, and we recommend applying nightly before bed for best results.

    • How soon can I expect to see results?

      Your lashes will appear fuller, healthier and longer after consistent use in just 8 weeks.

    • Can I use the serum with lash extensions?

      Yes, our serum is safe to use with lash extensions.

    • Can I use the serum under makeup?

      While you can use the serum under makeup, we recommend applying in the evening before bed and allowing 1-2 minutes to dry.

    • Will the serum cause any discoloration?

      Our serum will not result in discoloration and 100% of users did not experience any irritation caused by Liquid Lash™ Extensions Lash Serum.*

      *in a clinical consumer perception study of 32 subjects aged 21-69

    • Is the serum irritating for sensitive skin?

      Our clinically tested, high-performance formula provides results with non-irritating, vegan ingredients developed for sensitive skin.

    • Can I use the serum if I am pregnant or nursing?

      Our serum is made with gentle vegan ingredients, and is specifically made without ingredients known to be harmful to pregnancy*.

      *please consult your physician before using while pregnant

    • Do you offer a subscription discount?

      We offer free shipping on all of our auto-replenishment products, so you save with every purchase! Our auto-replenishment program will also make sure you never run out of your favorite products. Learn more HERE.

Our Commitment

  • Vegan and Cruelty-Free

  • Leaping Bunny Certified

Bigger than Beauty®
giving mission

For every product purchased, we donate to help communities thrive.

  • Cancer

  • Domestic Abuse

  • Homelessness + Poverty

  • Veterans

  • Racial + Social Justice

  • Under-Resourced Youth

  • Education

  • LGBTQ+

Our Causes

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