The brand suggests 90 to 180 days. The guarantee ends at 60. A plan lets you use both honestly.
Before the first gummy, write down a baseline: sleep, energy, mood and training, each rated 1 to 5 over a week. Keep other habits steady. Check in at day 30 and day 60 with the same ratings and notes on anything unusual.
At day 50, do a first review and decide whether you would continue. This gives you ten days to request a refund if you decide not to.
If you continue, do it knowingly, since the refund option has ended. Re-rate at day 90 and, if you went on, at day 180. If the ratings have not moved, you have a clear answer, and if they have, you still cannot be sure the gummy was the cause. Keep it honest and simple.