Sep 22, 2026 · 1h 9m
Newborn vitamin K prevents a dangerous return of bleeding
Ep 222 Vitamin K: Calling the shots
Newborns start with little vitamin K, making a simple, highly effective intervention crucial against potentially catastrophic bleeding.
- 1Newborns have low vitamin K stores, and breast milk provides too little to reliably prevent early-life bleeding.
- 2Intramuscular vitamin K is safer and more reliable than oral regimens, particularly for preventing late vitamin K deficiency bleeding.
- 3Flawed leukemia claims and persistent misinformation weakened trust in a prophylaxis whose benefits are strongly supported by evidence.
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The opening account of a nonresponsive infant whose emergency workup revealed blood makes the stakes of preventable vitamin K deficiency immediate.
The brief
Vitamin K activates proteins involved in clotting, bone health, and vascular function, but newborns begin life with unusually low stores and limited dietary supply.
That vulnerability can produce severe bleeding, including bleeding in the brain; the episode opens with an infant’s emergency evaluation after a lumbar puncture reveals blood.
The standard intramuscular injection prevents vitamin K deficiency bleeding more reliably than oral regimens, which require repeated doses and are less dependable against late bleeding.
Henrik Dam’s discovery helped make prophylaxis possible, while later research and clinical adoption transformed newborn care and sharply reduced bleeding deaths.
A flawed 1990s leukemia scare, supplement marketing, and medical mistrust now threaten uptake, even as surveillance suggests the injection remains highly effective and safe.
Featuring
Henrik DamMentioned
World Health Organization
International Agency for Research on CancerListen to the full episode and explore every guest, topic, and moment on PodLume.