The shelf life of the 7E Wellness Conductive Tx Gels and other skin care products follow the FDA Cosmetic Safety and Shelf-Life guidelines.  FDA does not require manufacturers to put expiration dates on labels.  Skin care products containing drugs such as sunscreens or Retin-A do require an expiration date.   In general, a skin care product’s “shelf life” generally refers to the length of time you can expect a product to look, smell and act as expected and to remain safe for use.  This length of time varies depending on the ingredients in the product, including the type of preservatives, type of product, how it is used and stored.Over time, products will begin to degrade or break down for a number of reasons.   Below is a list of the most common reasons: *Product contamination with soiled applicators or fingers. *Humidity and/or temperature change. *Exposure to sunlight and air can change texture, color and aroma. *Natural ingredients. *Weak preservatives.   To ensure the longevity of your skin care products, follow the guidelines below: *Avoid air contamination by keeping products tightly closed when not in use. *Use on clean single use applicators dipped into the product. *Do not double dip into a product container. *Do not leave products in extreme temperatures. *Keep containers clean and sanitized by handling containers with clean hands.   According to the 7E manufacturers, the Conductive Tx Gels have a shelf life of approximately one year after being opened and two years unopened.  If the gel has displayed a change in quality or consistency such as: separation, foul smell, mold, or color change please discard the product.  Glycerin can be obtained from both plant and animal sources. Common plant sources include soybeans or palm, and animal-derived tallow is another source. Vegetable glycerin is typically made from soybean, coconut, or palm oils, and is therefore considered to be vegan.  Our products use vegetable glycerin.