Vitamin K deficiency can slow blood clotting and cause more blood to accumulate under the skin as a bruise.
Notes on verification
Well-established physiological mechanism corroborated by multiple independent clinical/medical references including MSD Manuals and peer-reviewed overviews. [tier=gold indep_score=0.925 clusters=4 claim_tier=everyday | kind=empirical eligibility=high]
Sources
- Random Bruising: 13 Possible Causes Excluding Obvious Injury (seed:health_and_medicine)
- https://ada.com/conditions/vitamin-k-deficiency/ (corroboration)
- https://www.msdmanuals.com/professional/nutritional-disorders/vitamin-deficiency-dependency-and-toxicity/vitamin-k-deficiency (corroboration)
- https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/vitamin-k-deficiency (corroboration)
- https://www.healthdirect.gov.au/vitamin-k-deficiency (corroboration)