Weaker circadian signals mean fragmented sleep, difficulty falling asleep, reduced slow-wave sleep, and impaired REM cycles
S., Schulz, I
You can lower your chances of getting vitamin B12 and folate deficiency by eating foods that have the vitamins in them: Foods with vitamin B12 include any foods from animals, such as meat, fish, eggs, and milk
However, some individuals may experience mild injection site pain or bruising
Most studies adopt a serum 25-hydroxyvitamin D [25(OH)D] level below 20 ng/ml as the threshold for deficiency, though some employ alternative cutoff values (88)
Preclinical studies document significant brain concentrations after systemic (including oral) administration, with behavioral improvements in hippocampal-dependent tasks confirming functionally relevant CNS penetration (PMID: 23055539)