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.

Evidence last reviewed: August 2026

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.

Scientific references

Four week supplementation with mixed fruit and vegetable juice concentrates increased protective serum antioxidants and folate and decreased plasma homocysteine in Japanese subjects
Kawashima A, Madarame T, Koike H — Asia Pac J Clin Nutr, 2007
An encapsulated juice powder concentrate improves markers of pulmonary function and cardiovascular risk factors in heavy smokers
Bamonti F, Pellegatta M, Novembrino C — J Am Coll Nutr, 2013
Dietary intake and blood concentrations of antioxidants and the risk of cardiovascular disease, total cancer, and all-cause mortality: a systematic review and dose-response meta-analysis of prospective studies
Aune D, Keum N, Giovannucci E — Am J Clin Nutr, 2018

Where to buy

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