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Vitamin D in the bloodstream can also be associated with improved muscle function
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Vitamin D: How important is it for athletic performance?

Vitamin D: The ‘sunshine vitamin’ and muscle health

An afternoon lunch outside, a day at the beach, or simply getting some fresh air, you’ve likely heard someone say “I’m getting my vitamin D!” – or maybe you’ve said it?

Most people have heard our bodies can make vitamin D from the sun, but are we able to meet our daily needs from our afternoon sunbathing? Vitamin D is best known for helping build and maintain bone structure, and increases the absorption of calcium, which is the main mineral found in bones. Chronic low vitamin D intake leads to poor bone development in children and weak bones in adults. This can cause osteoporosis, or brittle bones, meaning you’re more likely to have a bone fracture or break.

Vitamin D also plays a role in immune function, protein synthesis and muscle function, inflammatory response, and regulation of skeletal muscle.

Based on the functions of vitamin D, what might the specific roles of the vitamin be for athletes and sport performance? While a lot of factors limit the amount of sun exposure that is turned into vitamin D, there is quite a bit of evidence that this sunshine vitamin can help support healthy athletes. More on that later.

There are several complicated steps involved with turning sun rays into vitamin D in the body. I’ll spare you the details. But let me present to you the realistic side of using the sun as a primary source of vitamin D. First and foremost, UV sun rays are quite damaging to our skin and increase the chance of skin cancer, so lathering up with sunscreen is a great defence against this damage. However, when we wear sunscreen, it blocks the UV rays from penetrating our skin, and UV rays are required for us to then make vitamin D in the body. But UV rays increase skin cancer risk, so sunscreen is more important than getting our dose of Vitamin D from the sun!

Further, other factors that reduce our ability to make vitamin D from the sun include the time of day, seasons (e.g summer vs. winter), cloud coverage, smog, and skin melanin (darker skin colors make less vitamin D). So athletes who train mostly indoors won’t get as much sun exposure as athletes training outdoors. A great comparison would be ice hockey players (indoor, winter sport) and track and field athletes (outdoor, spring sport). Ice hockey players will have significantly less sun exposure from indoor training or being covered in protective gear if playing outside. Whereas, track and field athletes will have higher sun exposure from training outdoors.

So, it looks like we need to turn to food for boosting vitamin D in athletes … although food sources might not be enough either. We will also discuss that later.


By Brittany Johnson - Scientific Affairs Manager at GNC (General Nutrition Centers)

August 26th, 2022


We take your reputation as seriously as we do our own. As many as one in ten sports supplements can be contaminated with ingredients and compounds prohibited in sport, so you need to ensure that your trusted nutrition partners consider their product development as seriously as you do your performance.

To ensure our certified supplements are safer for athletes, we test every single sports supplements batch for banned substances before being released to market. Our sports supplements certification process is trusted by sports professionals all over the world -- with Informed Sport, you can be confident your reputation is in safe hands.

Informed Sport is a global independent supplement testing and certification programme designed to test and provide certified supplements for elite athletes and drug-tested personnel. It is the only global certification programme that tests every single batch of a product before it’s released to market. When an athlete sees the Informed Sport quality mark, they can know it has been tested to the highest of standards. With Informed Sport, you can be confident your reputation is in safe hands.

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Frequently Asked Questions

Do you offer discounts for sports clubs?
Yes our 1000iu vitamin D3 tablets and 4000iu vitamin D capsules can be purchased with discount (minimum order required) to find out more message us via email where our dedicated accounts manager will reach out!
How do I become a partner with SunVit-D3

Here at SunVit-D3 we look to work with sports clubs on a fee basis, this is done simply by signing up to our programme again this can be done through our dedicated page or via

Do you have any means of allowing players to test their vitamin D levels?
Yes for players vitamin D levels to be tested we recommend our Rapid Vitamin D test which can be purchased directly with discount (multiple orders only) simply click the link or if you have any questions reach us at