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People who follow a vegan or strict vegetarian diet are at a higher risk of deficiency unless they take supplements or consume plenty of B12-fortified foods

It also helps in reducing hair loss by extending the anagen (growth) phase of the hair cycle

A capsule

The frailty reduction signal is more translationally relevant, as frailty is a recognized clinical syndrome in aging humans

A review of randomized trials found that L-tyrosine, a precursor to dopamine and norepinephrine, helped maintain attention and reaction time under acute stressors such as cold or sleep loss, with no clear benefit at rest

A crucial aspect of the treatment methodology was the method of delivery: intracerebroventricular (ICV) infusion