Quercetin is a plant-based flavonoid that is naturally found in many fruits and vegetables, and is considered to be a potent antioxidant with several expected health benefits such as anti-inflammatory effects and bone-conserving properties. Participants will supplement with either Quercetin, or placebo, for 90-days with pre- and post-testing visits.
Quercetin is a plant-based flavonoid that is naturally found in many fruits and vegetables such as onions, apples, berries, green tea, and red wine and is currently an FDA approved supplement. Quercetin is considered to be a potent antioxidant with several expected health benefits. Both in vivo and in vitro studies have demonstrated that quercetin acts as a potent natural osteogenic agent with benefits that include anti-inflammatory effects and bone-conserving properties. Quercetin is suggested to protect against bone loss by inhibiting bone resorption and stimulating bone formation which is indicated by an increase in bone mineral density and bone formation markers such as osteocalcin. The purpose of this study is to investigate the effects of quercetin supplementation on bone, specifically on bone turnover markers, in postmenopausal women. The interplay between cytokines (i.e., IL-6, CRP, and TNF-alpha) and bone turnover markers was also considered. In a double-blind, placebo-controlled fashion, we aimed to recruit 50, healthy, postmenopausal women between the ages of 45-75 years to participate in a 90-day supplement trial. Participants will be randomly assigned to one of two supplement groups: 1) quercetin 500 mg, once per day, or 2) placebo (methyl cellulose E4M) 500 mg, once per day for 90-days. Participants will be asked to visit the laboratory (KSU Human Performance Laboratory) on 2 separate occasions for pre- and post-testing visits consisting of body composition measurements and blood draws by a CITI approved/IRB approved research team member trained in phlebotomy under the supervision of Dr. VanDusseldorp.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
TRIPLE
Enrollment
33
Once-daily 500 mg Quercetin
Once-daily 500 mg methylcellulose 9E4M)
Kennesaw State University
Kennesaw, Georgia, United States
Osteocalcin ng/mL
Bone formation marker
Time frame: 90-days
PINP ug/L
Procollagen type-I N-terminal propeptide. Bone formation marker.
Time frame: 90-days
CTX ng/L
Type-I collagen cross-linked C-terminal telopeptide. Bone resorption marker.
Time frame: 90-days
IL-6 pg/mL
Interleukin-6 inflammatory marker.
Time frame: 90-days
TNF-alpha pg/mL
Tumor necrosis factor-alpha inflammatory marker
Time frame: 90-days
CRP mg/L
C-reactive protein inflammatory marker.
Time frame: 90-days
FBG mg/dl
Fasting blood glucose
Time frame: 90-days
BMD g/cm^2
Total, lumbar, right and left femur, and left forearm bone mineral density
Time frame: 90-days
Body composition
body fat percentage
Time frame: 90-days
Timed up and go (seconds)
Physical function test
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Time frame: 90-days
Dominant handgrip strength (kg)
Physical function test
Time frame: 90-days