Not necessarily. Our EcoFresh Nutrient Lock Packaging™ system is the best in the industry and protects the integrity of the fragile nutrients in our products quite well. The amber glass prevents the most damaging wavelengths of light from destroying fragile nutrients. In addition, the glass bottle, airtight metal lid with rubber seal, and oxygen absorber in the bottle effectively creates a vacuum, preventing oxidation of fragile nutrients. Once opened, it is recommended to store products in a dry, dark, cool place (e.g., kitchen cupboard).