Not Medical Advice: NIOXIN® products have a 36-month shelf life. However, once the product has been open for more than 12 months it may not be as effective as it once was.
According to Ulta.com, expiration dates are printed on the NIOXIN Systems 2, 4 and 6 only due to the UV protection in the ingredients. Manufacturer's suggestions are to use by expiration date.
Shelf life of cosmetics depends on period after opening and production date.
Period after opening (PAO): Some cosmetics should be used within a specified period of time after opening due to oxidation and microbiological factors. Their packaging has a drawing of an open jar, inside it there is a number representing the number of months.
Production date: Unused cosmetics also lose their freshness and become dry. According to EU law, the manufacturer has to put the expiration date only on cosmetics whose shelf life is less than 30 months. The most common periods of suitability for use from date of manufacture:
Perfumes with alcohol: about 5 years
Skin care: minimum 3 years
Makeup: from 3 years (mascara) to more than 5 years (powders)
Note: Expiration dates may vary depending on the manufacturer.
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