Physicians Formula Eye Booster Lash-Enhancing 2-in-1 Eyeliner Serum — Ultra Black, Hypoallergenic Lash-Boosting Precision

Physicians Formula Eye Booster is a dual-action liquid eyeliner that defines the lash line while delivering a lash-nourishing serum to help lashes look longer, fuller and thicker over time.

This innovative 2-in-1 tool combines a high-pigment, ultra-black liquid liner with a targeted Lash Boosting complex formulated to condition hairs at the base of the lash. Designed for sensitive eyes and approved by dermatologists, it works as an instant precision liner and a daily lash treatment you can wear alone or under makeup.

How quickly will I see a difference in my lashes?

Visible improvement is gradual because the product conditions and targets the base where lashes grow. Many users notice subtle enhancement within two weeks and more pronounced changes by four weeks when used consistently.

• Short-term: instant bold definition from the liquid eyeliner formula.
• 2 weeks: a portion of users reported perceiving longer, fuller lashes.
• 4 weeks: a larger share of users noted even more visible length and volume.
• Use daily for best cumulative results; results vary by individual.

Can I use this if I have sensitive eyes or wear contacts?

The formula is hypoallergenic and designed with sensitive skin and eyes in mind, making it suitable for many contact lens wearers. It is dermatologist approved and excludes a long list of harsh ingredients commonly avoided in sensitive formulations.

• Hypoallergenic formulation reduces irritation risk.
• Dermatologist approved for sensitive skin and eyes.
• Free from 150+ commonly avoided harsh substances.
• Apply carefully along the lash line to minimize eye contact.

How do I apply it for best results — as liner or serum?

The slim, precision tip creates clean lines when used as a liquid eyeliner; when applied as a serum, place a thin swipe at the lash base where it conditions the hair follicles. You can wear it alone for a natural boost or layer mascara and other eye makeup over it once dry.

• As eyeliner: draw a steady line close to the lash roots for instant definition.
• As serum: apply a thin coat directly at the base of lashes and allow to dry.
• Layering: safe to wear under mascara and other makeup after drying.
• Daily use yields the best cumulative conditioning effect.

What does "cruelty-free and vegan" mean for this product?

This product is formulated without animal-derived ingredients and is not tested on animals, aligning with cruelty-free and vegan standards. Those preferences ensure the product meets ethical sourcing and testing criteria without compromising performance.

• No animal testing during development or production.
• No animal-derived components in the formulation.
• Suitable for shoppers seeking vegan and cruelty-free cosmetics.
• Delivers cosmetic benefits without animal-based ingredients.

Who is this for? If you want a dependable, high-pigment liquid liner that also conditions lashes over time, this dual-purpose product suits makeup lovers who prefer streamlined routines and have sensitive eyes. It’s ideal for people seeking a bold, ultra-black liner with a built-in lash treatment, contact lens wearers looking for gentle formulas, and anyone aiming to add a conditioning step without extra products.

Ingredients

Water. Ethylhexyl Acrylate/Methyl Methacrylate Copolymer. Butylene Glycol. SD Alcohol 40. Beheneth-30. Ammonium Acrylates/Methyl Styrene/Styrene Copolymer. Glycerin. Myristoyl Pentapeptide-17. 1,2-Hexanediol. Acrylates/Octylacrylamide Copolymer. Caprylyl Glycol. Ethylhexylglycerin. Pentylene Glycol. Polyglyceryl-3 Disiloxane Dimethicone. Phenoxyethanol. Sodium Hydroxide. Disodium EDTA. Black 2.