As someone dedicated to making products that are free of preservatives, I began utilizing miron glass a number of years ago miron glass. This high-quality glass is imported from Europe. Its ability to filter out harmful ultraviolet light is the reason for its success. Several of my products are packaged in miron glass, which is quite expensive. I advise folks to reuse their jars to preserve other things (eg essential oils, olive oil, smoothies, etc.).