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    Ingredient guide · Ingredient reference

    Omega-3 in vegetables: plant fatty acids differ from fish oil

    Vegetables can contribute small amounts of plant omega-3, but a vegetable portion is not interchangeable with a fish-oil serving. Check the exact fatty acid and edible amount.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    An explicitly identified ALA example

    The USDA SR Legacy raw-zucchini entry lists 0.061 g alpha-linolenic acid per 100 g. A 200 g portion provides about 0.122 g. This amount is small compared with concentrated ALA sources such as flaxseed oil, chia seeds and walnuts described by ODS. [1][2]

    Leafy-green numbers need their original labels

    The older raw-spinach and raw-kale entries list 0.138 and 0.378 g respectively in the undifferentiated 18:3 field per 100 g. That is a fatty-acid class field, not a separately measured EPA-plus-DHA amount or a fully specified ALA result. It is more accurate to retain the field name than to label every such value fish-equivalent omega-3. [1]

    A hypothetical comparison by form

    Imagine a food log combines ALA from a vegetable with DHA from fish. Keep separate columns for the named forms before considering a total. ODS describes limited conversion of ALA into the longer-chain forms, so the numerical sum alone does not establish equal physiological delivery. These composition records do not show that eating vegetables is equivalent to taking a particular omega-3 supplement. [2]

    Hypothetical example — compare specified portions using historical reference data
    Raw zucchini portionALA estimate
    100 g0.061 g
    200 g0.122 g
    Omega-3 in vegetables: plant fatty acids differ from fish oil — 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. Omega-3 Fatty Acids - 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.