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Raw or cooked spinach: oxalates, minerals and preparation

By Claire Mercier · Nutritionist, MSc6 min readPublished 09/12/2026
Sources
7
Validated claims
4
Dominant evidence
Limited
Freshness
09/12/2026
Raw or cooked spinach: oxalates, minerals and preparation

Spinach has no single best preparation for every goal. Raw leaves keep a fresh texture; boiling, draining and discarding the water can remove some soluble oxalates.

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1. Oxalates and cooking Oxalates can be soluble or insoluble. A review reports that water cooking may reduce soluble oxalate, but it does not provide a universal value for every plate. In a laboratory trial, boiling spinach for 12 to 15 minutes and discarding the water reduced measured oxalates.

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2. Minerals: measurement is not a clinical benefit In a small human study, fractional magnesium absorption was lower with a spinach meal than with a kale meal; this does not provide a daily absorption rate for each portion. In an in-vitro study, blanching or cooking increased measured iron availability; this does not prove a clinical improvement in iron status.

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3. A practical choice Alternate methods: use raw spinach for texture and minimal heating; boil and drain when oxalate reduction is the priority; use short cooking when taste and volume matter most.

04FAQ ### Does steaming reduce oxalates like boiling? Water contact is different; steaming cannot be assigned the same reduction observed when cooking water is discarded.

01Should everyone avoid spinach? No. Most people can include it in a varied diet with a suitable preparation.
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Sources Full references are provided in the associated evidence dossier.

Sources

Peer-reviewed studies and institutional references used for this article.

  1. 1Cleveland Clinic· 2024
    Other sourceLimited

    general public guidance

    View source
  2. 2Harvard Health· 2019
    Other sourceLimited

    baby spinach laboratory cooking comparison

    View source
  3. 3Noonan et al., International Journal of Food Science & Technology· 2010
    Other sourceLimited

    laboratory spinach and vegetables

    View source
  4. 4Massey, Journal of the American Dietetic Association· 2007
    Systematic reviewEstablished

    food composition and bioavailability literature

    View source
  5. 5Lee et al., British Journal of Nutrition· 2004
    Randomized controlled trialLimited

    10 healthy adults · 10 participants

    View source
  6. 6Brogren & Savage, Asia Pacific Journal of Clinical Nutrition· 2003
    Other sourceLimited

    human meal study

    View source
  7. 7Yadav & Sehgal, Plant Foods for Human Nutrition· 2002
    Other sourceLimited

    processed spinach and amaranth leaves; in-vitro assay

    View source

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By

Claire Mercier

Registered nutritionist focused on whole-food diets and metabolic health.

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