Why You Need Vitamin D

by | Oct 8, 2021 | Mental Health, Nutrition Articles

Vitamin D carries out some pretty big roles in our body. Learn why this vitamin is so integral to your health and why it can be extra important to supplement during the fall and winter.

Although I love cozy fall and winter evenings, I do reach a point here in southern Ontario where I eventually begin to feel a little deprived of some bright, warm sunlight—and rightly so—we need it!

What is Vitamin D?

Vitamin D is a fat-soluble vitamin. It actually acts more like a hormone in our body than a vitamin and has countless important roles because nearly every tissue type in our body has a vitamin D receptor. This means having adequate vitamin D levels is crucial for good health and the function of many different systems in our body.

Sunshine is what enables our body to manufacture Vitamin D. It is made from the cholesterol in our skin when we’re exposed to sunlight.

Unfortunately, here in Canada, besides around May-October, we don’t get a whole ton of sun all year long. In the wintertime approximately 40% of Canadians are below the recommended vitamin D intake (and surprisingly 25% are low in the summer months).

Let’s explore what some good ol’ vitamin D does for us!

Health Benefits of Vitamin D

Bone Health

It’s well known that vitamin D is essential for bone health. One of its main roles is stimulating and controlling the absorption of calcium. It helps draw calcium into the bloodstream and increase its absorption from our intestines.

Vitamin D also works synergistically alongside magnesium and vitamin K2 for optimal bone health. Vitamin K delivers calcium from the bloodstream to bones and teeth and helps remove calcium deposits found in soft tissue.

Immune Health

The sunshine vitamin supports our immune system and actually helps activate the T cells in our body. These cells seek out and destroy different bacteria and viruses that can cause colds and flu. In fact, a study in 2010 found that vitamin D3 supplementation during winter may help reduce your chances of catching the flu.

Mental Health

Vitamin D helps to activate our “feel good” neurotransmitters, including serotonin and dopamine. This can be especially helpful for those who suffer from Seasonal Affective Disorder (SAD) where a lack of sunlight has an adverse effect on mental health. It also helps maintain our nervous system and may help boost mood in those with depression.

Blood Sugar & Diabetes Management

Vitamin D can help support insulin levels and even diabetes management, including Type 1 and Type 2. According to research, 2000IU of vitamin D may help reduce the risk of Type 1 Diabetes. There was also a that study found low levels may increase risk of Type 2 Diabetes.

Cardiovascular Health

Vitamin D can even support your heart and reduce your risk of heart disease.


There was a study that found participants’ cancer risk cut by 60% in those getting 1100IU per day, alongside calcium. How amazing is that?! Sufficient vitamin D levels in the body may also help reduce the risk of total rates of rates, including colorectalprostate, and breast cancer

How to Boost your Vitamin D Levels

Food & Lifestyle

Get sunshine on your skin (in Canada we get more sunlight between May-October) and enjoy dark coloured mushrooms, eggs, and fish like sardines, herring and mackerel, or a cod liver oil.

Those of us living in cooler climates with limited sun exposure during parts of the year usually need a bit of a boost. Many people can benefit greatly from supplementing with this sunshine vitamin during the fall and winter months.


There are two kinds of vitamin D you can take as a supplement: vitamin D3 (cholecalciferol) and vitamin D2 (ergocalciferol).

D3 is derived from lanolin—the oil found in sheep’s wool—while D2 is a plant-based source. D2 is a popular choice amongst vegans and vegetarians, however if possible, I recommend opting for D3 as it’s easier for the body to absorb.

You can take vitamin D in a liquid, soft gel, or tablet form. Vitamin D is fat-soluble and is therefore better absorbed when taken as liquid or encapsulated in an oil, as opposed to a hard, chalky tablet. Vitamin D absorption is best when taken with food.

Dosages vary depending on individual needs, but a safe amount to start with is 1,000IU, although many people require much more than that. Be sure to speak with your health care practitioner for the appropriate dose.

Are You Low in Vitamin D?

Low levels of vitamin D are more common than people would think. Dry skin, depression, osteoporosis, and conditions such as diabetes, heart disease, and even cancer, can be signs of low deficiency. A lowered immune function—such as frequent colds or flu—can also be implicated in vitamin D deficiency. Be sure to get your levels checked if you are concerned.

by Meghan Livingstone

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Hi, I’m Meghan. I’m a Certified Holistic Nutritionist, blogger, and YouTuber with a passion for healthy, simple living. I’m here to inspire you to listen to your body, eat mindfully and wholesomely, and create a fulfilling life that’s completely unique to you.