This randomized, double-blind, placebo-controlled study evaluates the effects of resO™ Bone and Joint Support Postbiotic on physical function, pain interference, mobility, and recovery in adults aged 18-75 years experiencing joint discomfort, stiffness, or reduced mobility.

Participants will be randomized to receive either resO™ or placebo for 4 weeks. Outcomes will be assessed using validated patient-reported outcome measures, including PROMIS Physical Function, PROMIS Pain Interference, Duke Activity Status Index (DASI), International Physical Activity Questionnaire-Short Form (IPAQ-SF), and pain numeric rating scales.

The primary objective is to evaluate whether resO™ improves physical function and reduces pain interference compared with placebo.

Joint discomfort and reduced mobility are associated with impaired physical function, pain interference, and decreased quality of life. Chronic low-grade inflammation and connective tissue degeneration contribute to limitations in daily activities and recovery.

This study evaluates resO™ Bone and Joint Support Postbiotic, a microbiome-informed supplement containing heat-inactivated Lactiplantibacillus plantarum RSB11® HI combined with glucosamine sulfate, chondroitin sulfate, methylsulfonylmethane (MSM), Boswellia serrata extract, curcumin extract, bromelain, and vitamin D3.

This is a prospective, randomized, double-blind, placebo-controlled, parallel-group study conducted remotely using electronic data capture. Approximately 40 participants aged 18-75 years with self-reported joint discomfort, stiffness, or reduced mobility will be randomized 1:1 to receive either resO™ or placebo for 4 weeks.

Primary endpoints include changes from baseline to Week 4 in:

PROMIS Physical Function T-score PROMIS Pain Interference T-score

Secondary endpoints include:

Pain intensity Numeric Rating Scale (NRS) Duke Activity Status Index (DASI) International Physical Activity Questionnaire-Short Form (IPAQ-SF) Activity limitation assessments Musculoskeletal recovery assessments Rescue medication use

Safety and tolerability will be assessed through adverse event monitoring and gastrointestinal tolerability questionnaires.

Inclusion Criteria

Provide voluntary signed informed consent Adults aged 18-75 years Self-reported joint discomfort, stiffness, or reduced mobility affecting daily activities In generally good health based on self-reported medical history Agree to maintain stable diet, exercise, and lifestyle patterns throughout the study Able and willing to comply with study procedures and electronic questionnaires Access to smartphone, tablet, or computer with internet access

Exclusion Criteria

Chronic inflammatory or autoimmune joint disease requiring immunosuppressive or biologic therapy Recent joint surgery or significant musculoskeletal injury within the past 3 months Current unstable use of prescription medications intended for joint pain or inflammation Regular use of joint-targeting supplements that cannot be discontinued prior to participation Known allergy or intolerance to study product ingredients Participation in another investigational study within the past 30 days Pregnant, planning pregnancy, or breastfeeding Significant uncontrolled medical condition that may interfere with study participation or interpretation of results Inability or unwillingness to comply with study procedures