The page does not list side effects, so this is general guidance for any new supplement.
Mild stomach upset, nausea or a slight headache are the kinds of things people notice with new supplements. They often settle if you take the gummy with food. Hives, swelling of the face or lips, trouble breathing, chest pain, a racing heartbeat, fainting or severe dizziness are not mild.
Stop for any of the second group and seek care.
If a mild effect persists beyond a few days, stop and see whether it resolves. Do not take more to get past it. Keep the bottle and your notes for your doctor. You are inside the refund window, so there is no reason to push through discomfort. Our earlier post on side effects covers the FAQ answer.