The purpose of this study is to determine whether Tanakan® is effective at slowing the progression from memory complaint to dementia of Alzheimer's type.

Inclusion Criteria:

• Spontaneously reporting a memory complaint
• Short anxiety battery test < 6, (only if patient screened at GP site)
• Geriatric depression scale < 15
• Mini-mental state (MMS) > 25 in GP's office (in hospital site MMS is done as complementary scale)

Exclusion Criteria:

• Objective memory impairment
• Clinician rated dementia staging system > 0.5
• Mini-mental state < 25
• Dementia, past history of seizures, Parkinson disease