Why Vitamin D Matters More in Your 40s

Vitamin D helps calcium absorption, bone health and normal muscle function. Here’s why maintaining adequate levels becomes important in your 40s.

By Divine Media 24 ·October 6, 2026 ·2 min read ·19 views ·Updated 27 October 2026, 3:56am

Actor Trisha Krishnan recently shared a glimpse of herself enjoying some morning sunlight, writing “And some vitamin D” on Instagram. Her post has also brought attention to why maintaining adequate vitamin D levels matters, particularly as people move through their 40s.
Vitamin D helps the body absorb calcium and plays an important role in maintaining healthy bones. It is also involved in normal muscle and nerve function. According to the National Institutes of Health (NIH), prolonged vitamin D deficiency can cause osteomalacia in adults, which can lead to bone pain and muscle weakness.
Bone health becomes increasingly important with age. In women, the decline in bone formation becomes more pronounced around menopause as estrogen levels fall, increasing the long-term risk of bone loss and osteoporosis. Adequate vitamin D and calcium are therefore part of maintaining bone health, although supplements are not automatically necessary for everyone.
Sunlight is one way the body produces vitamin D when ultraviolet rays reach the skin. However, the amount produced varies depending on factors including skin pigmentation, sun exposure and lifestyle. People who receive little sunlight may be at greater risk of inadequate vitamin D levels.
The NIH recommends 600 IU (15 mcg) of vitamin D daily for adults aged 19–70, including people in their 40s. Individual requirements can differ, particularly when deficiency or certain health conditions are involved.
Rather than relying on excessive sun exposure or high-dose supplements, maintaining a balanced diet and discussing testing or supplementation with a healthcare professional when appropriate can help support healthy vitamin D levels.