PLoS ONE 12 , e0175549 (2017)
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What is Vitamin B12, and why is it important
Sleep optimization strategies include maintaining consistent sleep-wake schedules, creating optimal sleep environments (cool, dark, quiet), limiting blue light exposure in evening hours, avoiding caffeine in the afternoon and evening, managing stress through relaxation practices, and addressing any underlying sleep disorders such as sleep apnea with appropriate medical treatment
Sublingual drops are easy
Simply telling patients to take tablets in the hope that they will absorb some of the B12 is based on dubious research and will force patients to by-pass their doctor