A normal blood or urine test may still miss a thiamine problem that is localized to a specific part of the brain. This clip explains how researchers have reported region-specific or functional B1 abnormalities in Parkinson’s, Alzheimer’s, Huntington’s, and other neurodegenerative conditions, including problems with transporting thiamine into vulnerable brain tissue. It also looks at animal research using high-dose B1 with biotin, and why these findings have led to further human investigation.

Some Parkinson’s patients show normal thiamine levels on standard blood tests, yet case reports have described substantial improvement after high-dose B1. This clip explores why thiamine responsiveness may not always look like a classic deficiency, and why normal blood or red-cell levels may not tell the full story about how B1 is functioning inside the nervous system.

Functional medicine often uses organic acids testing to look beyond nutrient levels in the blood and assess how metabolism is actually functioning. This clip explains how markers such as lactate, pyruvate, and alpha-ketoglutarate can point to problems with thiamine-dependent enzymes, giving a clearer picture of what may be happening inside the cells in real time.