A log is the only way to tell whether it is doing anything for you.
Each day: date, whether you took it, energy (1 to 5), mood (1 to 5), sleep hours and quality (1 to 5), activity, and any note such as stomach upset or a stressful day.
Use the same scale every day and write it at the same time.
Average each week and compare with your baseline. Look for a trend over several weeks. Note other changes you made, since they muddy the result. Review at day 30 and day 50, ahead of your refund deadline.