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    Ingredient guide · Ingredient reference

    Easy bruising: vitamin C, vitamin K and other explanations

    Severe vitamin C or K deficiency can contribute to abnormal bleeding. Unexplained bruising still needs assessment rather than a vitamin guess.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Two deficiencies act through different pathways

    Vitamin C deficiency impairs collagen formation and can produce bruising and poor wound healing in scurvy. Severe vitamin K deficiency reduces normal clotting function. Clinically significant K deficiency is rare in adults; neither explanation should be inferred from one bruise. [1][2]

    Bruising often follows damaged small blood vessels

    A bruise can occur when an injury lets blood leak into nearby tissue. MedlinePlus advises contacting a clinician for bruising without an injury or other explanation. Severe pressure or pain in a swollen bruised area needs urgent assessment. The pattern and history matter more than the color of a single mark. [3]

    Keep medication decisions separate from self-treatment

    Imagine new unexplained bruises appear while someone uses warfarin. Vitamin K changes can alter its action, so adding K without the prescribing team is not a safe diagnostic experiment. Report the bruising and review medicines, dietary changes and whether testing is needed. [2][3]

    Hypothetical example — distinguish a symptom from a confirmed nutrient diagnosis
    ObservationInterpretation
    Bruise after an impactLocal vessel injury is plausible
    Unexplained recurrent bruisesSeek assessment
    Warfarin plus a new K supplementRequires clinician coordination
    Easy bruising: vitamin C, vitamin K and other explanations — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Vitamin C - Health Professional Fact Sheet
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. Vitamin K - Health Professional Fact Sheet
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.
    3. Bruise: MedlinePlus Medical Encyclopedia
      Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.