In older age, vitamin B12 absorption tends to be less efficient due to a range of health issues, including gastritis stomach lining inflammation and thinning but also because of decreased production of stomach secretions (EFSA, 2015
This can be somewhat useful for healthier people, because it is reliant on the strength of that individuals ability to make glutathione
To elucidate this, mice that were deficient of hepatic igf1 using the CreloxP system were generated (303)
On a therapeutic note, some microbiota-targeted treatments have reduced protein aggregates in models: long-term broad-spectrum antibiotics reduced A deposition and microglial reactivity in an AD mouse model, and recolonization with a simplified microbiota reversed some of these effects, indicating that specific microbial communities can either exacerbate or ameliorate protopathic cascades [102]
Always consult a qualified healthcare professional before starting any new supplement, especially if you have existing health conditions, take medications, or are pregnant or nursing