Effect of quince fruit extract and apple cider vinegar on glycemic indices

Determining the effect of quince fruit extract and apple cider vinegar on glycemic indices in adults with prediabetes: A double blind randomized clinical trial

Status

Active, not recruiting

Phases

Phase 3

Study type

Interventional

Source

IRCT

Registry ID

IRCT20160822029472N3

Enrollment

108

Registered

2026-05-11

Start date

2026-06-22

Completion date

Unknown

Last updated

2026-06-01

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Prediabetes. Impaired fasting glucose

Interventions

Intervention 1: Intervention group: Recommended to consume one tablespoon (5 ml) of apple cider vinegar with a glass of water during each meal (breakfast, lunch, and dinner). Intervention 2: Intervent

Eligibility

Sex/Gender

All

Age

20 Years to 50 Years

Inclusion criteria

Inclusion criteria: Willingness to cooperate; Having prediabetes; Age between 20 and 50 years; No smoking or alcohol; No special diet; No weight change in the past 3 months; No pregnancy or breastfeeding; BMI between 20 and 30.

Exclusion criteria

Exclusion criteria: Intention to modify lifestyle or pharmacological therapy over the course of the study Unwillingness to consume the mixture of apple cider vinegar and quince fruit Known allergy or adverse reaction to apple cider vinegar Presence of gastrointestinal diseases (irritable bowel syndrome and inflammatory bowel disease)

Design outcomes

Primary

Measure	Time frame
Fasting plasma glucose. Timepoint: First, the sixth and twelfth weeks. Method of measurement: Enzymatic colorimetric method.	—

Countries

Iran (Islamic Republic of)

Contacts

Public ContactSeyed hosein davodi

Shahid Beheshti University of Medical Sciences

hdavoodi1345@gmail.com+98 21 2235 7483

Outcome results

None listed

Source: IRCT (via WHO ICTRP) · Data processed: Jun 11, 2026