Do Frozen Vegetables and Fruits Retain Their Vitamin Content?

Frozen fruit and vegetables can retain nutrients, but they are not universally higher or lower in vitamins than fresh produce. The product, time after harvest, pretreatment, and storage conditions affect the result.

Blanching and freezing. Brief blanching before freezing limits enzyme activity in most vegetables. Time varies with the vegetable and piece size; do not apply 1–3 minutes to every product. Excessive blanching can increase vitamin and mineral losses. Freezing slows quality changes but does not sterilize food.

Use. Follow package cooking instructions. Putting a frozen vegetable or fruit that requires cooking straight into a smoothie is not a safe shortcut. If thawing is necessary, use an appropriate cold method; do not leave food on the counter for a long time.

Buying. Choose intact packages containing frozen products and return them to the freezer promptly after shopping. Large ice crystals or clumping may indicate a quality problem, but appearance alone cannot establish the temperature history. Do not buy products if you doubt their cold chain.