Vitamin D3 capsule: We already know that sunlight allows the skin to produce vitamin D. However, increased sun exposure to prevent vitamin D deficiency may not be appropriate and it may be difficult to find in foods that have high vitamin D due to several factors. Therefore, it is popular to find a replacement for vitamin D in the form of dietary supplements because taking adequate amounts of vitamin D supplements will help with calcium absorption, strengthen bones, and prevent thin bones and osteoporosis.