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203 , 204 , 205 , 206 , 207 Problems with smell typically precede cognitive and motor symptoms and may occur as a result of the accumulation of betaamyloid and hyperphosphorylated tau in olfactory regions of the brain

Aside from that, vitamin B12 is an essential part of DNA synthesis, ensuring old and damaged cells are replaced with healthy ones

10.1038/srep30028 Sci

PMID: 10652388

Evaluating Risk Factors: Certain individuals are at a higher risk of vitamin B12 deficiency, including vegans and vegetarians, older adults, people with gastrointestinal disorders, and pregnant or breastfeeding women

The analyses of 5 -reductases in humans and animals highlight the differences between testosterone and DHT, and the significance of DHT in male sexual differentiation and prostate physiology and pathophysiology