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Study of promising Alzheimer’s marker in blood prompts warning about brain-boosting supplements

Elevated levels of an enzyme called PHGDH in the blood of older adults could be an early warning sign of Alzheimer’s disease, and a study led by the University of California San Diego provides new evidence to support this claim. In analyzing brain tissue, researchers observed a trend consistent with their previous findings in blood samples: expression levels of the gene coding for PHGDH were consistently higher in adults with different stages of Alzheimer’s disease, even the early stages before cognitive symptoms manifested.

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