Physicians Formula Eye Booster Super Slim Liquid Eyeliner — Ultra Black, Waterproof Precision & Lash-Boosting

Physicians Formula Eye Booster Super Slim Liquid Eyeliner is an ultra-fine, waterproof liquid liner with a precision brush tip and a lash-conditioning complex for long-wearing, sensitive-skin-friendly definition.

This waterproof eyeliner delivers an ultra-black finish from a super-slim brush tip that helps you draw hairline lines, sharp wings, or everyday definition with control. The quick-drying formula is enriched with a Lash-Boosting Complex to condition and help support healthier-looking lashes while being formulated for sensitive eyes. The brand’s hypoallergenic heritage means this liner avoids common harsh ingredients and is cruelty-free and vegan.

How does the super-slim brush tip improve application?

The brush tip is designed to be exceptionally fine and flexible, letting you vary pressure to create anything from barely-there lash definition to a dramatic cat eye. Because the tip is narrow, it reduces tugging and gives precise placement even along the tightline.

• Ultra-fine brush for micro lines and detailed wings
• Flexible bristles for controlled pressure and smooth strokes
• Good for tightlining and defining the inner lash area

Will it stay put through the day and resist smudging?

This formula is water-resistant and quick-drying, engineered to resist everyday humidity, minor rubbing, and light moisture so your line stays sharp longer. While it holds up well for all-day wear, remove it with an oil-based remover for best results.

• Waterproof finish that dries quickly on the lid
• Smudge-resistant wear suitable for daily activities
• Easily removed with dedicated makeup remover when needed

What does the Lash-Boosting Complex do for lashes?

The formula includes conditioning ingredients intended to help support the look of stronger, healthier lashes over time with regular use. It’s not a medical treatment, but daily application adds nourishing and protective components along the lash line to improve lash appearance and comfort.

• Conditioning agents to help reduce brittleness
• Formulated to support lash appearance when used consistently
• Works alongside other Eye Booster products for enhanced lash care

Is this eyeliner suitable for sensitive skin and cruelty-free users?

Physicians Formula developed this liner with sensitive skin in mind, following a long-standing approach to hypoallergenic formulations and avoiding 150+ known harsh ingredients. The product is vegan and cruelty-free, and is tested to be gentle on eyes prone to irritation.

• Hypoallergenic formulation for sensitive eyes
• Vegan formula and not tested on animals
• Created to meet strict safety and comfort standards

Who is this for: This eyelin er is aimed at anyone who wants the precision of a professional-fine tip with the durability of a waterproof liner—especially helpful for those with sensitive eyes or anyone seeking a cruelty-free, conditioning liner. It’s ideal for makeup users who value detailed lines, long-lasting wear, and gentle ingredients that support lash health without sacrificing bold, ultra-black definition.

Ingredients

Water/Eau, Propylene Glycol, Acrylates Copolymer, Butylene Glycol, Styrene/Acrylates Copolymer Acrylates/Ethylhexyl Acrylate Copolymer, Acrylates/Dimethylamino-Ethyl Methacrylate Copolymer, Phenoxyethanol, Simethicone, PPG-2 Methyl Ether, Caprylyl Glycol, Ammonium Acrylates Copolymer, AMP-Acrylates Diacetoneacrylamide Copolymer, Aminomethyl Propanol, Potassium Sorbate, Sodium Dehydroacetate, Dextran, Acetyl Tetrapeptide-3, Trifolium Pratense (Clover) Flower Extract, Black 2 (CI 7266), Blue 1 (CI 42090), [2206-1NE].