Let’s take altitude for a moment. Due to the second law of thermodynamics entropy is always increasing. As a result the active chemical molecules of a product are always degrading, albeit slowly. Eventually there will be a measurable decrease in potency. This can take several years with proper handling and storage. Unless stated otherwise the minimum shelf life for our products is 3 years after the date of manufacture. The date of manufacture is stated on the product label, labelled as “MFG”, next to the LOT #.
Unfortunately we can’t provide a more precise answer. True shelf life is variable and in most cases little data is available. FDA regulations require that no shelf life is given for a dietary supplement unless data can substantiate it. Rather that lie to you about the expiration date we’re just telling you how it is. Shelf life decreases with exposure to heat, moisture, oxygen and sunlight, which can create free radicals and break chemical bonds. Shelf life can be extended by deep freeze (-20°C or -80°C). A powder ingredient in deep freeze could have a shelf life in excess of 10 years with minimal degradation. It is not recommended to store a liquid, oil or solution product at anything below room temperature because this will alter the solubility properties and maybe precipitate the mixture, rendering it non-uniform and difficult to measure without resuspension.