This pilot study evaluates the effect of theory menu-based mini-videos on vitamin D adherence in older adult with osteoporosis. Half of participants will watch the videos while the other half will receive usual care (treating physician advice).

Osteoporosis is a common disease around the world. The morbidity and mortality attributed to osteoporosis is due to fracture. The evidence shows that vitamin D is effective in preventing osteoporotic fracture, however, adherence to vitamin D is low among people with osteoporosis (20%-60%). The Health Action Process Approach (HAPA) has been found useful to describe, explain, and predict changes in health behaviours in a variety of setting. Based on HAPA, mini-videos will be developed aiming to increase vitamin D adherence in people with osteoporosis. Mini-videos will address self-efficacy, outcome expectancy, risk perception and action and coping plan. This pilot study aims to evaluate the recruitment and participants' feedback about the mini-videos.

Inclusion Criteria:

• Over the age of 50 years
• Have been diagnosed with primary osteoporosis
• Have low vitamin D level (less than 75nmol/L) recently (within the previous month)
• Fluent in English

Exclusion Criteria:

• Cognitive diseases
• Mal-absorption syndromes that may interfere with vitamin D absorption.