The page calls this the single most relevant caution for its audience.
What the page says
Alpha lipoic acid can lower blood sugar. Combined with glucose-lowering medication, that raises the risk of low blood sugar. The amount in the capsule is not printed.
What to do
If you take diabetes medication or insulin, ask your doctor or pharmacist before starting, and do not change any medication yourself. Know the signs of low blood sugar, such as shakiness, sweating or confusion, and seek care if severe.
Medical note: Quiet Nerves is a dietary supplement for general nerve-wellness support and is not a treatment for neuropathy, nerve damage or any diagnosed condition. Persistent, worsening or spreading numbness, tingling or burning should be checked by a doctor. If you take diabetes medication, blood thinners such as warfarin, thyroid medication or antibiotics, or you are pregnant, nursing or recovering from surgery, consult your doctor before use.