Hairstory products have a two-year shelf life before being opened. Due to the rapid turnover of the products they sell, you won't receive anything that has been languishing in their warehouse for more than three to six months.
After opening, a product's POA (period after opening) is the amount of time it will last before it becomes hazardous or detrimental.
Even if a product has settled or separated after a lengthy amount of time (more than a year), it will continue to be helpful in cleaning, conditioning, or styling: It will not be detrimental.