# Oral supplement in healthy older adults to support physical fitness and mental wellbeing

## TL;DR

A cucumber extract supplement called Q-actin™ improved sleep quality and finger dexterity in older adults over 12 weeks.

## Contribution

Demonstrates Q-actin™'s potential to enhance sleep and physical dexterity in healthy older adults through melatonin-related effects.

## Key findings

- Q-actin™ supplementation increased melatonin derivatives in urine, linked to better sleep quality.
- Participants showed improved finger dexterity and self-reported sleep quality improvements.
- Findings suggest Q-actin™ may support overall wellbeing in older adults.

## Abstract

Cucumbers have been anecdotally credited with anti-inflammatory properties. IdoBR1 [(2R,3R,4R,5S)-3,4,5-trihydroxypiperidine-2-carboxylic acid], an iminosugar amino acid isolated from the fruits of certain cucumbers (Cucumis sativus, Cucurbitaceae), has been demonstrated to possess anti-inflammatory activity. Q-actin™ is a quality-controlled cucumber extract containing measured idoBR1, which has shown promising results in the treatment of osteoarthritis through oral administration.

A healthy middle-aged and older adult population was recruited and randomized to receive either Q-actin™ (2 × gummies containing 10 mg Q-actin™ daily) or matched placebo gummies for 12 weeks. Physical strength and finger dexterity were assessed using hand grip strength and the Nine-Hole Peg Test, respectively. We evaluated diet choices with the Prime Diet Quality Score and sleep quality with the Pittsburgh Sleep Quality Index and collected first-morning urine samples for chemical composition analysis using Flow Infusion Electrospray Ionization Mass Spectrometry (FIE-MS).

We recruited a cohort of 47 healthy middle-aged and older adults (ages 50–78; 15 men and 32 women). FIE-MS analysis on urines was conducted and we tentatively identified elevated melatonin derivatives after Q-actin™ supplementation, suggesting a positive effect on sleep quality, which correlated with self-reported Pittsburgh Sleep Quality Index. The relative m/z-transition areas of melatonin and its two main biotransformation products in selected urine samples after Q-actin™ supplementation were confirmed following LC-MS/MS fragmentation.

Q-actin™ demonstrated potential benefits in a healthy middle-aged and older adult population by improving sleep quality, as evidenced by elevated melatonin derivatives identified in urine samples and self-reported improvements on the Pittsburgh Sleep Quality Index and improved finger dexterity. These findings support the hypothesis that Q-actin™ may have positive effects on overall wellbeing, as shown here in healthy older people, and could be rated to enhanced sleep quality.

ISRCTN registry ISRCTN28705061 and clinicaltrials.gov/ NCT05878847.