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Limited evidenceGeneral health

Fruit & Vegetable Concentrates

Encapsulated dried juice powders sold as insurance against a poor diet. They reliably raise blood levels of carotenoids and folate, but no trial shows they improve health outcomes the way eating the produce does.

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What the science says

  • Raising blood micronutrient levels Moderate evidence

    A four-week randomised controlled trial in Japanese adults found mixed fruit and vegetable juice concentrates increased serum carotenoids and folate and lowered plasma homocysteine. Several similar trials report the same biomarker shifts, which is the most consistent finding in this literature.

  • Cardiovascular and pulmonary markers Limited evidence

    A randomised controlled trial in heavy smokers reported improvements in some markers of pulmonary function and cardiovascular risk with an encapsulated juice powder concentrate. Trials of this kind are small, short and frequently manufacturer-funded, and none measures clinical events.

  • Substituting for actual produce Limited evidence

    A dose-response meta-analysis of prospective studies found that higher blood concentrations of antioxidants track with lower cardiovascular and mortality risk, but supplement trials of isolated antioxidants have repeatedly failed to reproduce that benefit. Capsules deliver a fraction of the fibre and none of the food matrix.

Dosage & safety

Studied doseProducts are typically taken as 2-6 capsules daily, standardised to a stated juice-powder weight rather than to nutrient content. The trials used comparable label doses over 4-12 weeks.
SafetyGenerally safe. Concentrates are usually low in fibre and can contain concentrated sugars in powder form. Some brands supply substantial vitamin K, which matters if you take warfarin. High-oxalate ingredients such as spinach or beet may be an issue for people prone to kidney stones. Not a replacement for eating vegetables, and not a treatment for any deficiency without testing.

How to take it

TimingTiming does not matter.
With food?With a meal — the carotenoids and vitamin K need fat to absorb.
Worth knowingThese supply almost no fibre, which is much of what makes vegetables worth eating; treat them as a top-up, not a replacement.

Interactions

With medications

  • warfarin

    Some brands supply substantial vitamin K from greens, which reduces warfarin's effect. keep intake consistent and tell your prescriber before starting or stopping

With other supplements

  • multivitamins

    Duplication of vitamin A, vitamin K and minerals across two products. read both labels before taking them together

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Can fruit and vegetable capsules replace eating vegetables?

No: fruit and vegetable concentrates raise blood carotenoids and folate, but no trial shows they improve health outcomes the way eating produce does, and isolated antioxidant trials have repeatedly failed. They supply almost no fibre, so treat them as a top-up, not a replacement.

Do fruit and vegetable supplements actually raise nutrient levels?

Yes, with moderate evidence: a four-week randomised trial found mixed fruit and vegetable juice concentrates increased serum carotenoids and folate and lowered homocysteine, and similar trials agree. Biomarker shifts are not the same as fewer clinical events.

How many fruit and vegetable capsules should I take?

Fruit and vegetable concentrates are typically taken as 2–6 capsules daily with a meal, as in trials lasting 4–12 weeks. Labels are standardised to juice-powder weight, not nutrient content.

Are fruit and vegetable concentrates safe with warfarin?

Some fruit and vegetable concentrates supply substantial vitamin K from greens, which reduces warfarin's effect, so keep intake consistent and tell your prescriber before starting or stopping. High-oxalate ingredients may also matter if you form kidney stones.

Scientific references

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