Why need anti-Tau-protein agent in addition to Resveratrol for treating Alzheimer's

QUOTE

"Moussa says that resveratrol should be further tested in a phase III study, but the agent, by itself, is unlikely to be a complete treatment for Alzheimer’s. It does not inhibit destruction of brain neurons by tau, another protein aggregate involved in the disease, so a likely beneficial treatment would combine resveratrol with an agent that targets tau, he says."

SOURCE:

Https://gumc.georgetown.edu/news/Resveratrol-Appears-to-Restore-Blood-Brain-Barrier-Integrity-in-Alzheimers-Disease