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 the 3-bottle, 90-day package as matching the typical reviewer trial length, confirming the expiration date gives you enough runway to actually use the full package within that window.
The 6-bottle package carries the lowest per-bottle cost.
See Current Pricing