Checking the expiration date on your specific bottle is a simple step worth doing before you start.
Check the expiration date printed on each bottle when your order arrives, and note it somewhere alongside your order confirmation if you've ordered multiple bottles.
Since this formula's own materials describe results building across weeks 1-2, weeks 3-4, and into a second month, confirming the expiration date on the larger packages gives you enough runway to actually complete that full evaluation window.