10 Signs You're Vitamin D Deficient (Vitamin D Deficiency Test)

Do you know that research suggests that there are one billion people worldwide who are deficient in Vitamin D? 

Because of this, it becomes very important to know the signs and symptoms of Vitamin D deficiency. In addition to understanding the signs and symptoms, you need to know there is also a simple test that helps you know if you are Vitamin D deficient.

So, you must also know what is that simple test and how to interpret that test to know whether you are low in Vitamin D or not. 

And the most crucial piece is knowing the best form of Vitamin D supplement to take for maximum health benefits.

vitamin d

In this blog post, we will cover all these topics about Vitamin D Deficiency.

What Is Vitamin D?

To start off: What is Vitamin D? Vitamin D is a fat-soluble Vitamin that is needed for several functions of your body, to keep your bones in good shape, to keep your immune system in good shape, to keep your whole body in good shape, especially your hormones. We need Vitamin D.

Signs And Symptoms Of Vitamin D Deficiency

So what are the signs and symptoms? Let's get started. 


The first sign and symptom of Vitamin D deficiency is feeling tired or fatigued all the time. 

There was a research study done on 480 adults that showed if your body is low in Vitamin D, then you have more chances of feeling tired and fatigued. 

And the best part was that increasing your Vitamin D levels is able to give you more energy. 

This means, if you're feeling tired in the morning or during the day around 2 or 3 o’clock during the day you feel or you feel like you need to take a nap or you're feeling tired all the time, then it might be because of low Vitamin D.

Sleep Issues

Having problems with sleeping, insomnia or disturbed sleep has also been linked to Vitamin D deficiency. 

The reason behind this is the sleep hormone called melatonin. We have seen that low Vitamin D interferes with the proper functioning of the melatonin in your brain and in your body.

Sleep issues

Because of this, you get poor sleep or disturbed sleep. 

So if your sleep is not proper, make sure you get your Vitamin D levels checked.

Getting Sick Easily

Another symptom is that you're getting sick more easily.

It can be anything like getting coughing episodes all the time, getting colds very frequently, sinus infections, or any other kinds of infections.

If any of these are more often than the others, then it means your immune system might not be functioning properly.

Vitamin D plays a very vital role in keeping your immune system healthy. 

So, if you're getting sick very often, then it might be because of Vitamin D deficiency.

Body Aches or Pain

Body aches, muscle pain, or bone pain are also signs of Vitamin D deficiency. 

The reason is that Vitamin D plays a very important role in lowering inflammation in the body.

Body Aches or Pain

When you are low in Vitamin D, then your inflammation levels go high and that may be the reason you're getting muscle pain, muscle aches, or bone pain.

Hair Loss

The next symptom is hair loss.

If you're having hair loss problems, then again Vitamin D might be playing a role in it.

This is because Vitamin D regulates the hormonal balances in your body, especially your thyroid hormones, your testosterone, your female hormones as well as your adrenal hormones. 

All of these hormones play a very vital role in your hair growth. 

Any dysfunction in these hormones can cause hair loss. So Vitamin D deficiency can be linked to hair loss issues also.

Autoimmune Conditions

Any autoimmune conditions like Hashimoto's conditions, thyroid problems, MS, lupus, or rheumatoid arthritis, can also be the symptom of Vitamin D.

if you have any autoimmune disease, then Vitamin D might be the reason for it. The reason is that Vitamin D plays a very important role in regulating your immune system.

We have several research papers that suggest people who are low in Vitamin D have higher chances of getting these autoimmune conditions.

Bone Issues

Osteoporosis, weak bones, or bone fractures are other signs of Vitamin D deficiency. 

As you all may know, Vitamin D plays a very important role in our bone health. Without Vitamin D we do not get calcification of our bones. So, our bones do not get strong.

Bone Issues

Because of this, when the body is deficient in Vitamin D, bones become weak leading to bone fractures.

Anxiety or Depression

Feeling anxious, depressed, or stressed out all the time can be another sign of a lack of sufficient Vitamin D.

Vitamin D plays a very vital role in producing several neurotransmitters and chemicals that are responsible for keeping your mood in check.

When Vitamin D levels are low in the body, it interferes with the proper functioning of these neurotransmitters or brain hormones.

This can lead to mood dysfunction symptoms as said like anxiety or depression.

Weight Gain

Research studies have proven that people who are overweight or obese have higher chances of being Vitamin D deficient.

This means, your weight gain can be linked to low Vitamin D.

Skin Issues

Eczema or hives on your skin are also a symptom of skin issues.

Vitamin D plays a very vital role in keeping your skin cells in good shape. It also maintains the immune system in the skin region of your body and thereby is very important in your skin health.

Skin Issues

Consequently, we have seen that people who are low in Vitamin D have higher chances of getting eczema or hives on their bodies.


So, you know these are all the signs or symptoms of Vitamin D deficiency. 

Now, the next question arises - 

How to test for Vitamin D? 

How to interpret that test?

What is the best way to keep your Vitamin D in good levels?

Knowing these are very important. So, that’s exactly what we will be talking about in the next part.

How To Test Vitamin D Levels?

While signs and symptoms can hint at a potential Vitamin D deficiency, they aren't conclusive. In To proceed with proper treatment or care, clinical confirmation through proper testing is essential. 

We can now talk about how to test Vitamin D levels to accurately assess your status. 

Testing ensures precise insights into your Vitamin D levels and guides appropriate interventions for optimal health.

To assess your Vitamin D levels, a simple blood test is available. Even if you've previously undergone testing for Vitamin D levels and received normal results, it's crucial to review them again.

This is because most labs show a wide range of Vitamin D levels reporting them in nanograms. Most lab results report a typical range from 30 to 100 nanograms per milliliter (ng/mL) as normal.

However, research suggests that having Vitamin D levels at the lower end of this normal range may indicate insufficiency. Ideally, maintaining levels between 50 to 60 ng/mL ensures your body receives adequate Vitamin D for optimal functioning. 

Therefore, it's essential to go back to your lab results and check the levels. 

If your levels are below 40 ng/mL, it is important to start Vitamin D supplementation. This ensures your body receives sufficient amounts.

Importance Of Vitamin D Supplementation

Now, you might be wondering: can you get enough Vitamin D from food and sunlight alone, or do you need supplements?

Read on to know why you should consider Vitamin D supplementation to get sufficient Vitamin D for your body.

Getting Vitamin D From Food Sources

As said, you can get Vitamin D from food sources. But here is the catch.

Vitamin D comes in two forms: Vitamin D2 and Vitamin D3. 

Most commonly the food sources can only provide you Vitamin D2. The problem is this Vitamin D2 needs to be converted to Vitamin D3 and then further processing of this Vitamin D3 is the only way your body can utilize it. 

Vitamin D From Food Sources

In several people this is not happening, so that's the reason food is not the best way to get your Vitamin D levels up. Often, even people who are eating very healthy diets have a very low Vitamin D levels. The reason is that their body cannot utilize that Vitamin D.

Getting Vitamin D From Sunlight

Now the other thing a lot of people think is that getting adequate sunlight can also raise their Vitamin D levels. 

Let me tell you an interesting fact: a lot of people who are living in Equatorial countries like Africa and Asia have their Vitamin D levels among the lowest in the whole world. 

So even with sun exposure, it cannot be guaranteed that you are getting an adequate amount of Vitamin D.

So this is where supplementation with Vitamin D is very important, especially during the winter months it becomes very important because you are not getting any sunlight as well as your Vitamin D levels are the lowest during the winter months.

Types Of Vitamin D Supplements

So, now that you know Vitamin D supplements are important, which Vitamin D supplement should you choose?

There are different kinds of supplementations for Vitamin D and it is very important to know the right supplement. 

The majority of the over-the-counter Vitamin D supplements are Vitamin D2 and they are useless because again they are not giving you the right form of Vitamin D supplement. 

So, it is very important to take a Vitamin D3 supplement only.

Vitamin D Supplements

One more thing to consider here is to take a Vitamin D3 supplement which also gives you Vitamin K2. 

Why should you take Vitamin D3 with Vitamin K2?

As you may know, Vitamin D plays a very important role in calcium absorption and deposition in the bones.

If you're taking Vitamin K with Vitamin D, it makes sure that all this calcium in your body is directly going to your bones and making your bones stronger.

Otherwise, it has been shown that there is some concern that some of the calcium that is being absorbed by Vitamin D can lie in your arteries and cause some C calcification over there. 

So, if you're taking a Vitamin D supplement, make sure you're taking Vitamin D3 along with Vitamin K2 ensuring all that benefit of calcium goes directly to your bones and nowhere else in the body.

Dosage Of Vitamin D Supplements

Let’s address the next question: What is the appropriate dosage of Vitamin D3 that you need to take? 

Most people are, again, taking very low amounts of Vitamin D3, probably only 100 or 400 international units, which is again very low. It is recommended that the range of Vitamin D3 supplementation needs to be between 2,000 to 5,000 international units on a daily basis to keep your Vitamin D levels in a good range.


So there you have it, a detailed understanding of the signs and symptoms of Vitamin D deficiency, along with information on how to interpret your test results and the correct approach to supplementing with Vitamin D3. Take the time to review your test results and ensure your Vitamin D levels are optimal for your health.