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If taking NAC on an empty stomach causes stomach pain or mild nausea, it is perfectly acceptable to take it with a small amount of food to improve tolerability

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Niacinamide: Niacinamide, or vitamin B3, is a powerful antioxidant that improves the skin's barrier function, evens out skin tone and reduces the appearance of pores

Once reconstituted, the solution is refrigerated never frozen

Shelf life is determined by the manufacturer and is commonly up to 2 years, depending on formulation and packaging