Provide the customer service representative with your name and Nutrisystem membership number — outlined on your billing material — and tell the representative that you wish to cancel your membership and stop all food shipments. The Best Meal Delivery Plans. Call the return line toll-free at and ask for a return authorization number. Ship back the Nutrisystem food that you already have to get your money back if this was your first Nutrisystem shipment. How to Use Nutrisystem While Breastfeeding. The address for returning the Nutrisystem food is as follows:

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