Physicians Formula Eye Booster Super Slim Liquid Eyeliner, Waterproof Ultra Black

For makeup looks that call for controlled, precise definition, Physicians Formula Eye Booster Super Slim Liquid Eyeliner offers an ultra-fine brush tip and a rich Ultra Black shade. Its slim applicator is designed to help create a natural line or a more defined cat eye and wing.

The waterproof liquid formula glides on, dries quickly, and is designed to resist smudging for all-day wear. That makes it a practical choice when you want eye definition with a clean, natural finish.

The Eye Booster collection also features a Lash-Boosting Complex. The formula is made for sensitive skin and is vegan and cruelty-free.

Product specs

• Type: Liquid eyeliner
• Shade: Ultra Black
• Applicator: Super slim brush tip
• Formula: Waterproof, with a Lash-Boosting Complex
• Finish: Natural
• Product claims: Sensitive skin approved, vegan, and cruelty-free

The brush tip is the key detail for shoppers choosing between a fine liquid liner and a thicker applicator. Its narrow shape is designed for maximum control, giving you the flexibility to keep the line subtle or build a more noticeable cat eye or wing. The deep black formula glides on easily, then dries quickly, so the finished look stays crisp rather than feeling like a drawn-out application.

Tips for day-to-day use

Choose the line style that suits the look you want: a natural line for understated definition, or a wing when you want a more graphic shape. Want one liner that can support both approaches? The fine brush tip and Ultra Black color make this product suited to either, while the natural finish keeps the look versatile.

The waterproof, quick-drying formula is designed to resist smudging for all-day wear. This can be useful for days when you want your eye makeup to remain defined through a full day, without choosing a liner solely for a bold, dramatic finish. For shoppers who prioritize a slender applicator and precise placement over a broader liner tip, the Super Slim design offers a clear point of difference.

Everyday use

Use it to add a fine line for a natural makeup look, or shape the line into a cat eye or wing for more definition. The brush tip is designed to give you control across these styles, so the same eyeliner can suit a restrained everyday look as well as a more pronounced eye. Its deep Ultra Black shade keeps the line distinct, and the natural finish works with the range of looks described for the product.

The formula’s Lash-Boosting Complex is intended to strengthen and condition lashes. It adds a care-focused element to an eyeliner designed for application, while the sensitive-skin-focused formulation and cruelty-free, vegan claims may matter to shoppers choosing eye makeup with those preferences in mind.

Final verdict

Physicians Formula Eye Booster Super Slim Liquid Eyeliner is a focused choice for anyone who wants an ultra-fine brush tip, waterproof wear, and the flexibility to draw natural lines or wings. Its Ultra Black color, quick-drying formula, and Lash-Boosting Complex bring practical application features together in one liquid liner.