Detailed answer

Niacinamide, also known as vitamin B3, plays a crucial role in hydrating dehydrated skin by improving its moisture barrier. It enhances the production of ceramides, which are natural lipids that help protect the skin's outer layer and prevent moisture loss. By increasing ceramide levels, niacinamide strengthens the skin's barrier function, allowing it to retain hydration more effectively.

Moreover, niacinamide also helps to boost the production of natural moisturizing factors (NMFs) in the skin, such as hyaluronic acid, which further aids in hydrating the skin. Additionally, it has anti-inflammatory properties that can reduce redness and irritation, common symptoms of dehydrated skin.

Furthermore, niacinamide supports the restoration of skin's natural lipid content, resulting in improved moisture retention. It also assists in regulating oil production, which can be disrupted in dehydrated skin, helping to balance the skin's hydration levels.

In summary, niacinamide plays a vital role in hydrating dehydrated skin by strengthening the moisture barrier, increasing production of NMFs, reducing inflammation, and supporting the restoration of natural lipid content.