Synbiotic Supplementation in Cyclists

Inclusion Criteria: * Male or female between the ages of 18-45 * Currently cycling for at least 3 hours per week for the past 3 months * Free of any contraindications to exercise and any medical condition that could interfere with or influence metabolic or cardiovascular responses to exercise * Have a resting heart rate \<100 bpm and resting systolic and diastolic blood pressures \<160 mmHg and \<90 mmHg, respectively. Exclusion Criteria: * Use of antibiotics or probiotic products within 4 weeks prior to study enrollment (note: participants will be eligible after a 2-week washout period) * Current laxative use * Are a smoker or use tobacco products * Consume \>21 units of alcohol per week * Have donated blood in the previous 3 months * Have a BMI ≥30kg/m2 * Are pregnant or lactating or planning to become pregnant for the duration of the study * Are dieting for weight loss or are following a low carbohydrate diet * Have participated in another clinical trial within the 30 days preceding study enrollment * Are taking medications known to affect cardiovascular or metabolic responses to exercise * Have a medical condition that could interfere with study intervention and assessment * Have current musculoskeletal injuries that limit exercise capacity * Are non-English speaking