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    Ingredient guide · Ingredient reference

    Lower-vitamin-K vegetables: portions and consistency matter

    Potato, sweet corn and zucchini have lower K1 values than leafy greens in these raw-food records. Low does not mean zero, and warfarin use does not require eliminating vegetables.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Selected lower values

    USDA SR Legacy reports vitamin K1, or phylloquinone, at 0.3 mcg per 100 g raw sweet yellow corn, 2 mcg for raw potato with skin, 4.3 mcg for raw zucchini with skin and 13.2 mcg for raw carrot. These are selected examples, not a universal low-vitamin-K menu. [1]

    Use the food as eaten

    These raw entries allow a consistent composition comparison. They are not advice to eat potatoes raw, and a cooked dish requires a matching cooked record and consideration of added ingredients. Larger portions still supply more vitamin K. NIH ODS advises people taking warfarin to maintain consistent vitamin K intake because changes can alter its anticoagulant effect; avoiding all vegetables is not the principle. [2]

    A hypothetical serving comparison

    For 100 g raw zucchini, the reference K1 amount is 4.3 mcg; 200 g gives 8.6 mcg. Doubling the portion doubles the estimate. If a clinician has asked you to track intake, record preparation and amount rather than relying on the word low alone. Medication decisions should follow the treating team’s instructions. [1][2]

    Hypothetical example — apply reference composition to specified hypothetical portions
    Hypothetical raw portionK1 estimate
    Zucchini 100 g4.3 mcg
    Zucchini 200 g8.6 mcg
    Carrot 100 g13.2 mcg
    Lower-vitamin-K vegetables: portions and consistency matter — 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. USDA FoodData Central — SR Legacy April 2018 composition and portion tables
      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.