Effects of greens+® A Randomized, Controlled Trial

Publication: Canadian Journal of Dietetic Practice and Research
July 2004

Abstract

Greens+® is a popular natural health product marketed as energy-enhancing; however, no objective data substantiate this claim. The study objective was to determine if ingestion of greens+® 1. increases vitality, energy, and perception of wellbeing; 2. increases overall mental health and general health, and 3. decreases the incidence of colds and flus in an otherwise healthy female population. A total of 105 women were enrolled in this 12-week, randomized, double-blind, placebo-controlled clinical trial; 63 (60%) completed the treatment protocol. Both treatment and placebo groups showed a significant time trend effect, scoring better on all outcome measures as the trial progressed. Compared with the placebo group, the greens+® group scored marginally higher on vitality, the primary outcome measure (p=0.055), and significantly higher on energy (a secondary outcome measure, p=0.018). Findings were based on repeated measures analysis of variance; baseline scores were used as covariates. Although a trend toward greater improvement in the greens+® group was noted in the other secondary outcome measures, this trend did not reach statistical significance. Overall, our findings were positive but not conclusive that greens+® increases vitality and energy. These results provide justification for further study of the effects of greens+®.

Résumé

Greens+® est un produit naturel populaire vendu pour ses propriétés énergisantes, sans toutefois qu’aucune donnée objective n’appuie cette allégation. Le but de l’étude était de déterminer si l’ingestion de greens+® 1. accroît la vitalité, l’énergie et la perception de bien-être; 2. améliore la santé mentale globale et la santé générale et 3. réduit l’incidence de rhumes et de grippes dans une population féminine en bonne santé. Au total, 105 femmes ont participé à cet essai clinique de 12 semaines, à répartition aléatoire, à double insu et contrôlé avec groupe placebo; 63 femmes (60%) ont suivi le protocole de traitement au complet. Le groupe traité et le groupe placebo ont tous deux montré un effet significatif du temps, en obtenant de meilleures notes à toutes les mesures de résultats à mesure que l’essai avançait. Comparativement au groupe placebo, le groupe greens+® a obtenu des notes légèrement plus élevées pour la vitalité, mesure de résultat primaire (p=0,055), et significativement plus élevées pour l’énergie (mesure de résultat secondaire, p=0,018). Les résultats étaient basés sur une analyse de variance avec mesures répétées; les notes de base ont été utilisées comme covariables. Bien qu’on ait noté une tendance vers une plus grande amélioration dans le groupe greens+® pour les autres mesures de résultats secondaires, cette tendance n’était pas statistiquement significative. Dans l’ensemble, nos résultats étaient positifs mais ne permettaient pas de conclure que greens+® accroît la vitalité et l’énergie. Ils justifient la poursuite de l’étude des effets de greens+®.

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Information

Published In

cover image Canadian Journal of Dietetic Practice and Research
Canadian Journal of Dietetic Practice and Research
Volume 65Number 2July 2004
Pages: 66 - 71

History

Version of record online: 12 February 2007

Authors

Affiliations

Heather Boon, BScPhm, PhD
Faculty of Pharmacy, University of Toronto, Toronto, ON
Joyce Clitheroe, MLT, BHA
The Michener Institute for Applied Health Sciences, Toronto, ON
Tonia Forte, MSc
Department of Public Health Sciences, University of Toronto, Toronto, ON

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