Since this formula's own guarantee is calculated from your purchase date, your order confirmation email is worth keeping accessible from day one.
Your order number, the purchase date, the exact package and price you paid, and any correspondence with customer support — all worth keeping in one place, not just your inbox.
Since this formula's own materials require returning all products, including empty bottles, for a refund, keeping your confirmation email and holding onto bottles protects your ability to use the full 60-day guarantee window.