Overall, niacinamide can help build proteins in the skin and lock in moisture to protect against environmental damage.
1. Supplemental protein
Niacinamide helps build keratin, a protein that keeps skin firm and healthy.
2. Skin barrier
Niacinamide helps your skin grow a ceramide (lipid) barrier, which in turn helps retain moisture. This is good for all skin types, especially if you have eczema or mature skin.

3. Reduces redness and spots
Niacinamide can help reduce inflammation, which may help relieve redness from eczema, acne, and other inflammatory skin conditions.
4. Shrink pores
There may be a second benefit to keeping your skin smooth and hydrated - pores naturally shrink over time.
5. Moisturizing
The benefits of moisturizing aren't just for people with dry skin. Niacinamide can also help regulate the amount of oil produced by the sebaceous glands and prevent your glands from overworking.
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