Swanson® brand products include a Best By date and/or a Manufactured (MFG) date. A “Best By” date indicates that the product will successfully meet the claims made on its label up until the date given. These products undergo rigorous stability testing to determine the most accurate dating for our finished products. A “Manufactured” date states when the product was bottled. In most cases, supplements are considered stable at full potency for 2-3 years from the manufactured date. Most liquid supplements and probiotics are typically stable for one year from the manufacture date. This does not include food items or topical/cosmetic products (creams, lotions, shampoo, etc).