Researchers at York University claimed that the high concentration of Vitamin B12 in Marmite helped increase levels of chemicals in the brain which protects against Alzheimer’s and Parkinson’s. A nuerotransmitter called Gamm-Amino Butyric Acid is increased which calms the brain resulting in reduced anxiety, induce sleep and calm nervous conditions.
Sources: Can Marmite help against dementia? This study says it could
How is Marmite made:
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Wikipedia: https://en.wikipedia.org/wiki/Marmite