Which product is typically used to promote nail growth?

Nail strengtheners are specifically designed to promote nail growth by reinforcing the structure of the nail. These products often contain proteins, vitamins, and minerals that nourish the nails and improve their overall health. This enhancement can lead to stronger and healthier nail growth over time, making nail strengtheners a go-to choice for those looking to enhance their nail length and durability.

To contrast, while top coats are intended to provide a protective layer over polish, cuticle oil is primarily focused on moisturizing the cuticle area and maintaining skin health around the nails. Meanwhile, base coats help polish adhere better and create a barrier between the nail and the polish, but they do not directly promote nail growth. Therefore, nail strengtheners are specifically formulated to support and encourage healthy nail growth, making them the correct answer to the question.