The Ordinary Niacinamide 10% + Zinc 1% The Ordinary Niacinamide 10% + Zinc 1% ($6) is a bestselling product that helps clarify congested skin. While, naturally, that's helpful in any season, its zinc PCA and vitamin B3 work to reduce excess sebum that can cause visible oiliness in hot weather. Image Source: sephora.com The Ordinary Niacinamide 10% + Zinc 1% $6 from sephora.com Buy Now