The Pro-Vitamin Thin-to-Thick Hair Thickening Conditioner -Your hair and scalp are easily damaged by an increasingly hazardous environment. This super revitalizing conditioner provides precisely the type of complete nutritional, environmental and UV protection you need. Reinforces and strengthens weak, chemically processed hair, by infusing Amino Acids into the hair cortex. ExpirationThis product has no expiration date or the manufacturer has not provided an expiration date.