The Study
Evaluating the potential of natural product combinations with sorbic acid for improving preservative action against food-spoilage yeasts.
This study tested a bunch of natural stuff with a food preservative in a lab dish to see if they work better together. It found they didn’t — but that’s only in the lab, not in real food or in your body.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists tested if common natural ingredients like herbs or spices could team up with sorbic acid (a food preservative) to kill yeast better than sorbic acid alone.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 53 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means adding natural ingredients won't help reduce the amount of sorbic acid needed in food — manufacturers must still use the same amount to prevent spoilage.
- 2All 200 natural products tested, plus combinations of three ingredients and even in soft drinks, failed to improve sorbic acid's ability to kill yeast — every test showed no synergy (FICI ≥ 0.5).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Fungal biology
Year
2023
Authors
Harry J. Harvey, A. Hendry, D. Archer, S. Avery
Related Content
Claims (5)
Sorbic acid is a man-made food additive made from compounds originally produced by mold, and it is used in processed foods to prevent bacteria and fungi from growing.
Testing 200 natural products with sorbic acid under different glucose levels showed no consistent increase in antifungal effectiveness against Saccharomyces cerevisiae or Zygosaccharomyces bailii compared to sorbic acid alone.
Combining sorbic acid with two natural substances in a soft drink does not enhance the ability to kill spoilage yeasts more than expected, and adding more ingredients does not improve this effect.
Sorbic acid and natural products do not work together more effectively than expected, regardless of whether the sugar level in the environment is high or low.
Sorbic acid does not combine effectively with other preservatives to enhance their effects, because it inhibits cells through multiple mechanisms simultaneously.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.