CoQ10 is made by the body and involved in energy production.
The wording
The page says levels can fall with age and that it supports cardiovascular function and circulation to the hands and feet. It also warns that CoQ10 may reduce warfarin's effect.
The caveats
The claims are general and the amount is not printed. Anyone on warfarin or other blood thinners should ask a prescriber before use. Do not change any medication on your own.
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.