Skip to main content
Health & Nutrition
Zaheera Swing
Nutritional Therapist & Herbalist BSc Hons Nutritional Science + NTPD

4 Reasons Your Body Needs Vitamin D3 & How To Tell If You’re Deficient

Vitamin D3, often dubbed the 'sunshine vitamin', is a crucial nutrient produced by our bodies when our skin cells are exposed to sunlight. Its key functions include supporting immunity, regulating mood, promoting joint and bone health, and maintaining blood sugar balance.

However, given modern lifestyles and seasonal changes, it's challenging for many people to get enough Vitamin D from sunlight and diet alone, leading to widespread deficiencies. Symptoms of deficiency can include fatigue, bone pain, depression, and impaired wound healing, among others. Supplementation with Vitamin D3 has shown to be effective, with Vitamin D3 and K2 supplements being particularly beneficial due to their synergistic roles in supporting bone health and preventing unwanted calcium deposits in soft tissues.



With over 40% of Americans suffering from low Vitamin D3 levels, it’s safe to say this deficiency is an epidemic! And it’s pretty likely you’re not getting enough. Our bodies need Vitamin D3 to function correctly, and low levels can leave you tired and under the weather, weakening your immunity and bone health. [1] No thanks!

Vitamin D is called the sunshine vitamin since it’s produced in our bodies when our skin cells are exposed to UV rays from the sun [2]. But with modern lifestyles and seasonal changes, it can be challenging to get enough. Even though it’s found in some foods, it’s almost impossible to get adequate quantities through diet alone, leading to Vitamin D deficiency.



What are the symptoms of Vitamin D deficiency?


  • Fatigue or tiredness
  • Bone pain or muscle weakness
  • Depression
  • Impaired wound healing
  • Hair loss
  • Increased risk of infections
  • Softening of the bones (osteomalacia)
  • Delayed growth in children
  • Bone fractures in older adults


N.B: The above symptoms may not only be specific to low Vitamin D levels - a doctor's diagnosis is necessary to confirm Vitamin D insufficiency. 

Keep reading to find out how Vitamin D3 works its magic in your body and the best way to raise your levels fast and effectively to avoid Vitamin D deficiency...



1. Immune Health


Your immune system is packed with Vitamin D3 receptors. Vitamin D3 comes in to fill these receptors, regulating the activity of critical immune cells in the process [3].

Vitamin D3 also increases cathelicidin, a chemical with potent antimicrobial properties that helps to fight off foreign invaders and improve immune function. Studies even show that supplementation with Vitamin D3 may reduce the risk of respiratory tract infections [4] [5].



2. Sunny Mood


Feeling blue? Clinical trials have shown that Vitamin D3 deficiency and depression go hand-in-hand. Vitamin D3 affects mood in multiple ways by regulating serotonin and dopamine, two essential neurotransmitters involved in feelings of well-being, happiness, and sleep [6] [7].

There may also be a link between Vitamin D3 deficiency and seasonal affective disorder (SAD) since Vitamin D3 stores are typically depleted during the winter months as people get less exposure to sunlight. With this link in mind, researchers found that Vitamin D3 supplementation was associated with a significant improvement in depression scores in those with SAD! [8]

Doctors in the northern hemisphere commonly prescribe a Vitamin D supplement to maintain adequate levels, particularly during winter.



3. Joint & Bone Health


One of Vitamin D’s top roles in the body is to support calcium absorption in the intestines. Calcium is an essential mineral required for strong bones and muscle contraction. And because of Vitamin D’s prime role in its absorption, Vitamin D deficiency may also be associated with low calcium levels. Calcium absorption is essential for maintaining bone mineral density [9] [10].

Not only is Vitamin D3 essential for bone health, but research also shows that deficiency in this vital vitamin may result in achy, painful joints and sore muscles. Clinical studies have found that supplementing with Vitamin D3 may help soothe joint discomfort by supporting healthy inflammatory responses [11] [12].



4. Blood Sugar Balance


Blood sugar balance is an essential foundation for overall health. Keeping your blood glucose levels stable can help to support sustained energy and weight loss, protect brain health and even support healthy cardiovascular function! [13] [14] 15] [16] 

Vitamin D3 plays an essential role in how your body regulates blood glucose, so much so that Vitamin D3 deficiency has even been associated with an increased risk of developing type 2 diabetes! You see, Vitamin D3 helps to increase your body’s sensitivity to the hormone insulin, which transports glucose out of the blood and into your cells to produce energy [17] [18].




The Best Way To Benefit From Vitamin D3



Vitamin D3 supplementation is the most effective and efficient way to get your Vitamin D stores to optimal levels, especially if your access to sun exposure is or you have a history of skin cancer.

However, not all Vitamin D supplements are created equal, and many fall short... This is why we created AdaptoZen Vitamin D3 + K2 Drops!

Vitamin D3 is the most bioactive and bioavailable form of Vitamin D, proven to boost Vitamin D levels significantly more than Vitamin D2. That's why we’ve included a potent dose of 5000 IU of D3 in our convenient, fresh peppermint-flavored formula. Since Vitamin D3 is a fat soluble vitamin, we’ve also included organic olive oil and MCT oil for maximum absorption. [19] [20].

But did you know that taking dietary supplements containing only Vitamin D3 isn’t the best idea? As mentioned, Vitamin D supplementation enhances calcium absorption, which can be problematic since excess calcium can get stored in soft tissues like arteries, which may increase the risk of heart disease. 

Vitamin K2 helps to direct calcium into your bones where it is needed, preventing calcium deposits in soft tissue. This makes Vitamin D3 and Vitamin K2 the perfect partnership! [21]

Learn more about this topic here from Dr. Dimitar Marinov.


Before you go, if you’d like to increase your Vitamin D intake through dietary sources, you may be wondering what foods are highest in Vitamin D. Let’s take a look:

  • Fatty fish such as salmon, tuna, and mackerel
  • Egg yolks
  • Mushrooms
  • Beef liver




Final Thoughts


In conclusion, Vitamin D3 is a vital nutrient for our overall health and well-being. It plays a crucial role in immunity, mood regulation, joint and bone health, and blood sugar balance. With over 40% of Americans suffering from low levels of Vitamin D, it's clear that this deficiency has reached epidemic proportions. The best way to ensure you're getting enough of the sunshine vitamin is to add a Vitamin D3 + K2 supplement to your daily regimen, especially when there is limited sun exposure.

Don't let a deficiency hold you back, boost your levels and feel the magic of Vitamin D3 working its wonders in your body!

Note: This article is for informational purposes only and not intended for use as medical advice. Always consult your healthcare provider before starting any dietary supplement.

Taking high doses of Vitamin D can result in Vitamin D toxicity over time. Therefore, it's always recommended to get your Vitamin D level tested every 4-6 weeks while taking dietary supplements containing Vitamin D.



Zaheera Swing
Nutritional Therapist & Herbalist BSc Hons Nutritional Science + NTPD
As a qualified Nutritional Therapist (BSc Hons Nutritional Science + NTPD), Zaheera Swing has a deep passion for restoring balance and harmony to the body through the modalities of nutritional science, herbalism, and holistic lifestyle practices. Using the functional medicine model coupled with wisdom from ancient paradigms, she aims to provide insight into the underlying root causes of poor health and the holistic tools we can harness to enhance the well-being of mind, body, and spirit.
Learn More

Featured Article


Dive deep into the NutriRise products, ancient wisdom, and abundant living with co-founders Basim & Ramsha Mirza

More on this

Your source for abundant living
Get the latest NutriRise recipes, videos & offers delivered to your inbox

Your Cart

Your cart is currently empty.
Click here to continue shopping.
Thanks for contacting us! We'll get back to you shortly. Thanks for subscribing Thanks! We will notify you when it becomes available! The max number of items have already been added There is only one item left to add to the cart There are only [num_items] items left to add to the cart