When’s the Last Time You Spent Time in the Sun?


This is an important question to answer, because vitamin D from sun exposure is the best way to optimize your vitamin D levels and thereby reduce your risk of a wide range of diseases. 

Unfortunately, it’s been suggested that only about 30 percent of Americans’ circulating vitamin D is the product of sunlight exposure, which is an unfortunate byproduct of public health agencies’ misguided advice to stay out of the sun to avoid cancer (when in fact vitamin D from sun exposure will prevent cancer). Another obvious reason is the majority of us work indoors, and when not working, do not spend enough time enjoying outdoor recreation.

Occasional sunlight exposure to your face and hands is insufficient for vitamin D nutrition for most people. To optimize your levels, you need to expose large portions of your skin to the sun, and you may need to do it for more than a few minutes. And, contrary to popular belief, the best time to be in the sun for vitamin D production is actually as near to solar noon as possible. Ultraviolet light from the sun comes in two main wavelengths — UVA and UVB. It’s important for you to understand the difference between them, and your risk factors from each.

First there is UVB, the healthy wavelengths that help your skin produce vitamin D. Then there is UVA, which is generally considered the unhealthy wavelengths because they penetrate your skin more deeply and cause more free radical damage. Not only that, but UVA rays are quite constant during ALL hours of daylight, throughout the entire year — unlike UVB, which are low in morning and evening, and high at midday.

So to use the sun to maximize your vitamin D production and minimize your risk of skin damage, the middle of the day (roughly between 10:00 a.m. and 2:00 p.m.) is the best and safest time. During this UVB-intense period you will need the shortest sun exposure time to produce the most vitamin D.

As far as the optimal length of exposure, you only need enough to have your skin turn the lightest shade of pink. This may only be a few minutes for those who have very pale skin.

Once you have reached this point your body will not make any additional vitamin D and any further exposure will only result in damage to your skin. Most people with fair skin will max out their vitamin D production in just 10-20 minutes, or, again, when their skin starts turning the lightest shade of pink. Some will need less, others more. The darker your skin, the longer exposure you will need to optimize your vitamin D production.  If sun exposure is not an option a vitamin D3 supplement can be taken orally.

Research published by Grassroots Health from the D*Action study shows the average adult needs to take 8,000 IU’s of vitamin D per day in order to elevate their levels above 40 ng/ml, which they believe is the absolute minimum for disease prevention.

Important: Your Serum Level is what Really Matters

While 8,000 IU’s of vitamin D3 per day is a general recommendation that appears to be beneficial for most people, vitamin D experts from around the world are in agreement that the most important factor is your vitamin D serum level. There’s no specific dosage level at which “magic” happens. So the take-home message is that you need to take whatever dosage required to obtain a therapeutic level of vitamin D in your blood.

At the time (in 2007) the recommended level was 40-60 nanograms per milliliter (ng/ml). Since then, the optimal vitamin D level has been raised to 50-70 ng/ml, and when treating cancer or heart disease, as high as 70-100 ng/ml.





9 thoughts on “When’s the Last Time You Spent Time in the Sun?

  1. I am sorry but I do not agree with this advice given the prevalence of skin cancer, largely caused by sun exposure.
    As someone who has to be particularly cautious given my cancer treatment and thus use sunscreen and SPF clothing, hard to believe that you advocate sun exposure at peak periods. I do, of course, believe in the benefits of Vitamin D, although the recommended standard is 2,000 IU daily.

    1. Hi Andrew, I’m sorry if I offended you from my post but, vitamin D from sun exposure is the best source. However, UVB from the sun is the healthy wavelengths that helps your skin produce vitamin D. Then there’s UVA. The UVA is generally considered the unhealthy wavelengths because they penetrate your skin more deeply and cause more free radical damage. Now, it’s important to know what time of day to avoid the UVA thus the reason why I posted that. Here’s a study you might find interesting: http://www.ncbi.nlm.nih.gov/pubmed/19519827 and http://www.skincancer.org/prevention/uva-and-uvb/understanding-uva-and-uvb

      I appreciate your comment!


  2. Thanks for getting back to me. I looked at the two sites (thanks) but I don’t see how the advice in the latter site jives with your recommendation for Protect yourself from UV radiation, both indoors and out. Always seek the shade outdoors, especially between 10 AM and 4 PM. And since UVA penetrates glass, consider adding flat, tinted UV-protective film to your car’s side and rear windows as well as to house and business windows. This film blocks up to 99.9 percent of UV radiation and lets in up to 80 percent of visible light.

    Outdoors, dress to limit UV exposure: Special sun-protective clothes with UPF (ultraviolet protection factor) indicate how much UV radiation can penetrate the fabric; the higher the UPF, the better. A shirt with an UPF of 30, for example, means that just 1/30th of the sun’s UV radiation can reach the skin. Laundry additives can also be washed right into regular fabrics to provide higher UPFs. However, you can enhance your sun safety simply by learning to evaluate everyday fabrics’ sun protection qualities and choosing those with the best protection. For instance, bright- or dark-colored, lustrous clothes reflect more UV radiation than do pastels and bleached cottons; and tightly woven, loose-fitting clothes provide more of a barrier between your skin and the sun. Finally, broad-brimmed hats and UV-blocking sunglasses help shield the sensitive skin on your head, neck, and around the eyes – areas that usually sustain a lot of sun damage. between the hours 10 and 2, given that we cannot only expose ourselves to UVB and not UVB. Quote on preventive measures:

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    1. Thank you! Vitamin D is very important and if you’re able to spend the necessary time in the sun to get the natural form of D’s, take advantage. However, don’t overload!

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