Amyloid and tau sit behind most Alzheimer's headlines. They are rarely explained in plain language.
Amyloid plaques build up between brain cells. Tau tangles form inside them. These changes can begin many years before symptoms, and blood biomarkers can now help detect them. What they cannot do is predict your future on their own. Here is what each protein does, and what you can measure today.
One builds up between neurons, the other forms inside them.
Amyloid beta is a fragment produced when a larger protein, APP, is broken down. Normally it is cleared from the brain. In Alzheimer's, certain forms accumulate into plaques between neurons. Tau helps support the internal structure of neurons. In Alzheimer's it becomes abnormally phosphorylated and forms tangles inside them. Tau burden tends to track cognitive symptoms more closely than amyloid burden does.
Not everyone with a biomarker change will develop dementia. The biology and the symptoms do not start at the same time, which is why a result is most useful read alongside the rest of your biology.
What brought you here?
Three ways in, one page. Pick the one that sounds like you.
Early information is most useful when you can act on it.
At BetterBrain, pTau-217 is an optional add-on. The core panel focuses on the broader modifiable picture: vascular, metabolic, inflammatory, and nutritional markers. The question is what you would do with a result once you have it.
See everything we test ↗Use the long window for what you can change.
Alzheimer's-related changes can begin years before symptoms. Many factors associated with long-term brain health can be addressed well before then.
Amyloid and tau biology can be assessed with PET imaging, cerebrospinal fluid testing, and increasingly with blood-based biomarkers such as pTau-217.
A biomarker change does not predict your future on its own. BetterBrain reads it alongside cognition and your vascular, metabolic, inflammatory, and nutritional markers.
Blood pressure, lipids, blood sugar, physical activity, hearing, and sleep are all associated with long-term brain health, and all can be addressed well before symptoms.
Biomarkers can change. One case is not a clinical trial.
One member, Joan (name changed for privacy), came to BetterBrain at 59 with a family history of dementia, an elevated pTau-217 result, and elevated ApoB and Lp(a). Her plan included clinician-directed treatment, lipid management, Zone 2 cycling, and cognitive stimulation. At her 90-day follow-up, BetterBrain reported improved memory and processing speed, and pTau-217 moving into a less concerning range. One case cannot tell us which intervention caused the changes, or whether another person would see the same.
See what BetterBrain tests ↗Know what each test can tell you.
PET imaging, cerebrospinal fluid testing, and blood biomarkers all assess amyloid or tau biology. None of them, alone, tells you whether or when symptoms will develop.
pTau-217, a phosphorylated tau fragment measured in blood, is an optional add-on at BetterBrain. It is read alongside cognition and 50+ vascular, metabolic, inflammatory, hormonal, and nutritional markers, rather than as a standalone answer.
Information is one input. The plan is the product.
BetterBrain does not hand you a number and wish you luck. Every result is read inside a system built to explain what it means for you, and where you can take meaningful action.
There is more to brain health than two proteins.
Up to 45% of dementia cases are potentially preventable, according to the 2024 Lancet Commission, which identified 14 modifiable risk factors across life. The useful question is where your own margin lies.
Review the evidence ↗Clear answers, without false certainty.
Do amyloid plaques mean Alzheimer's?
Amyloid plaques are a hallmark of Alzheimer's biology, but biomarker positivity alone does not tell you whether or when symptoms will develop.
Can you test for amyloid and tau without a brain scan?
Yes. Blood biomarkers such as pTau-217 can help detect Alzheimer's-related pathology in appropriate clinical settings.
What removes amyloid plaques naturally?
No food or supplement has been shown in randomized trials to reliably remove existing amyloid plaques.
Does everyone develop amyloid with age?
Amyloid positivity becomes more common with age, but it is not universal and does not always correspond to cognitive impairment.
The biology can start years before symptoms. So can your plan.
pTau-217 is an optional add-on to the BetterBrain panel, read with cognition, 50+ markers, and expert interpretation. A Brain Health Coach turns it into a personalized action plan, ranked by impact.