Ettusais Lip Essence is a popular lip care product that has garnered a significant amount of attention in the beauty industry. As a scientist with a deep understanding of skincare ingredients, I will provide an honest review of this product, taking into account its formulation, efficacy, and overall performance.

The Ettusais Lip Essence is formulated with a blend of emollients and moisturizing agents, including glycerin, squalane, and royal jelly extract. These ingredients are known for their hydrating properties and ability to lock in moisture, making them ideal for combating dry and chapped lips.

Glycerin, a humectant, attracts water to the skin and helps to retain it, providing long-lasting hydration. Squalane, a natural component of skin’s sebum, has excellent emollient properties that soften and soothe the skin. It also has a natural affinity to the skin, being one of the main components of the skin’s lipids, and thus absorbs quickly without a greasy residue. Royal jelly extract, a substance produced by honeybees, is rich in nutrients and known for its moisturizing and healing properties.

The product also contains SPF 18 PA++, offering some protection against harmful UV rays. However, it's worth noting that for optimal sun protection, a higher SPF is generally recommended.

In terms of efficacy, many users report that Ettusais Lip Essence provides immediate relief to dry lips, leaving them feeling soft and hydrated. The product has a glossy finish, which some users might find appealing, while others may prefer a more matte look.

One potential downside is the inclusion of fragrance in the ingredient list. While it might provide a pleasant sensory experience, fragrance can potentially cause irritation for those with sensitive skin or allergies.

In conclusion, Ettusais Lip Essence is a well-formulated product that delivers on its promise of providing hydration and comfort to the lips. Its blend of moisturizing ingredients works synergistically to nourish and protect the lips, although the inclusion of fragrance might not suit everyone. As with any skincare product, individual experiences may vary, and it's always recommended to patch test a new product before full application.