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Using Sunlight to Increase Vitamin D Levels

Updated: Jan 15



















Using sunlight to increase vitamin D levels is a natural and effective method because the skin can synthesize vitamin D when exposed to ultraviolet B (UVB) radiation from the sun. Vitamin D is essential for several bodily functions, including maintaining bone health, supporting the immune system, and regulating various cellular processes.

Here's how sunlight exposure helps increase vitamin D levels:


  1. Sunlight exposure: When your skin is exposed to sunlight, specifically UVB rays, it triggers the conversion of 7-dehydrocholesterol (a compound present in the skin) into previtamin D3.

  2. Previtamin D3 conversion: Previtamin D3 is an unstable compound that quickly undergoes a thermal conversion to become vitamin D3 (cholecalciferol).

  3. Vitamin D3 synthesis: Vitamin D3 is then absorbed into the bloodstream and transported to the liver, where it undergoes further processing to become calcidiol (25-hydroxyvitamin D).

  4. Active form of vitamin D: Calcidiol is the storage form of vitamin D, and it undergoes one final conversion in the kidneys to become calcitriol (1,25-dihydroxyvitamin D). Calcitriol is the biologically active form of vitamin D that exerts its effects on various tissues and organs.


To maximize vitamin D synthesis from sunlight exposure:


  • Aim for direct sunlight: Exposure to sunlight between 10 am and 3 pm is most effective for vitamin D synthesis. This is because the angle of the sun's rays allows for more penetration of UVB through the atmosphere during these times.

  • Expose enough skin: The more skin exposed to sunlight, the more vitamin D can be synthesized. However, be mindful of not staying under direct sunlight for too long to avoid the risk of sunburn and skin damage.

  • Consider your location: Vitamin D synthesis is more efficient in regions closer to the equator because the sun's rays are more direct. People living at higher latitudes may have reduced vitamin D synthesis during the winter months when the sun is lower in the sky.

  • Skin color matters: Individuals with darker skin produce vitamin D less efficiently compared to those with lighter skin, as melanin, the pigment responsible for skin color, reduces UVB penetration.

  • Be cautious with sunscreen: While using sunscreen is essential for protecting your skin from harmful UV rays and reducing the risk of skin cancer, it can also inhibit vitamin D synthesis. If you are specifically trying to increase your vitamin D levels, consider spending some time in the sun without sunscreen (around 15-30 minutes) before applying it.


However, it's essential to strike a balance between getting enough sunlight to boost vitamin D levels and protecting yourself from overexposure, which can lead to sunburn and increase the risk of skin cancer. If you are concerned about your vitamin D levels, or if you have limited sun exposure due to certain factors (e.g., living in high latitudes, having dark skin, staying indoors most of the time), consider discussing supplementation with your healthcare provider. They can help determine the appropriate dosage based on your individual needs and circumstances.

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