I am very sorry to say that nothing heals the disease. Depending on the particular cause for dementia, there is usually no cure. Dementia can actually be caused by several factors, not just age. Medications, illnesses (diabetes is one), etc.
You may want to check this out about Mannatech. It is considered a fraud and has not been approved by the FDA, which means that long term effects have not yet been explored.
This company is a Multi Level Marketing company that feeds off of the portion of the population desperate to find a cure. IT IS NOT A CURE NOR IS IT A TREATMENT.
Mannatech Sued for Fraud and Invasion of Privacy