Chronic non-specific low back pain (CNSLBP) is a prevalent condition contributing to pain, functional limitations, and reduced quality of life. Core stabilization exercises (CSE) have shown promise in enhancing spinal stability and reducing symptoms. Additionally, vitamin D supplementation plays a critical role in musculoskeletal health. Study objective will be to determine combined effect of vitamin D supplementation and core Stabilization exercises is better than core Stabilization Exercises alone in reducing pain-related and functional independence among chronic non-specific low back patient A randomized controlled trial will be conducted on 52 adults aged 25-45 diagnosed with Chronic non-specific low back pain.

Subjects will be divided into two groups: the intervention group will receive an 8-week Core stabilization exercises program alongside daily vitamin D supplementation, while the control group will receive either Core stabilization exercises alone Visual Analog Scale (VAS), and Oswestry Disability

Inclusion Criteria:

• Adults aged 25 to 45 years will be included.
• Both gender Male /Female will participate.
• Subjects with diagnosed non-specific low lumber pain persisting for at least 12 weeks will be included.
• Subjects must have baseline pain score of ≥4 on the Visual Analog Scale.
• Confirmed serum vitamin D levels <30 ng/m will be included

Exclusion Criteria:

• Low lumber pain due to specific causes such as fracture malignancy infection or inflammatory diseases (e.g. ankylosing spondylitis).
• Presence of significant comorbidities that could interfere with participation (e.g. cardiovascular neurological or respiratory disorders).
• History of spinal surgery within the last year.
• Subjects currently taking vitamin D supplements or undergoing other treatments for vitamin D deficiency.
• Use of medications such as corticosteroids or opioids that might affect pain perception or functional assessment.
• Enrolled in any other physical therapy or pain management program within the last three months.