The review found no eligible studies for this question.
B vitamins showed no clear difference in incidence of MCI or dementia > 2 to 5 years of supplementation compared with placebo (moderate certainty).
Intramuscular vitamin K showed no clear difference in bleeding complications: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in necrotizing enterocolitis: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in sepsis: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in sepsis: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in mortality (all infants): 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in mortality (all infants): 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in bleeding complications: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in intraventricular hemorrhage > Grade II: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 5: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 5: 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 25: 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in presence of PIVKA II at day 25 ‐ 0.2 mg IV versus 0.5 mg IM compared with intravenous vitamin K (low certainty).
Intramuscular vitamin K showed no clear difference in necrotizing enterocolitis ‐ 0.2 mg IV versus 0.2 mg IM compared with intravenous vitamin K (low certainty).