Two things we lack during the winter are sunshine and, consequently, vitamin D. In our northern climate, most of the sun's UVB rays are absorbed by the ozone layer, meaning we may struggle to produce any vitamin D at all during the winter months. This makes winter supplementation of vitamin D extremely important!
The term “vitamin D” refers to various fat-soluble vitamin variants all of which are cholesterol-like substances. ️Functionally, vitamin D works more like a hormone than a vitamin and is closely linked to the work of the parathyroid glands.
There is no other vitamin that requires more whole-body participation than vitamin D. The skin, bloodstream, liver, and kidneys all contribute to the formation of fully active vitamin D. With that said, fully active vitamin D is referred to as calcitriol, or vitamin D3 (which you may see on supplement labels).
Vitamin D & Bone Density
Boosts Immune Function
Improves Mood and Combats Depression
How to Get Vitamin D
Vitamin D can be found in fish liver oil and cod liver oil. It’s important to note that the animal-derived forms of vitamin D may be the most desirable supplementation form as the body is able to convert them into fully active vitamin D3 (calcitriol). The plant derived form is called vitamin D2 and does not appear to have the same functions as vitamin D3.
Unless you are eating a lot of wild caught fish, supplementation of vitamin D becomes very important during the winter months. Supplementing with both a high quality liquid fish oil or fish oil capsules as well as vitamin D is a wise decision for anyone getting little sun or living in northern climates.
️As mentioned, northern populations have been shown to have low levels of vitamin D. Research conducted at the University of Calgary concluded that virtually 100% of all Canadians are vitamin D deficient during some part of the year when sunlight exposure is scarce. So now the question becomes:
How Much Do We Need?
As a general rule of thumb, the Canadian RDA (Recommended Daily Allowance) for children and adults aged 9-70 should intake 600IU of vitamin D per day, with adults 70+ getting 800IU. This number however is usually the minimum amount and most people have other considerations that would support taking more vitamin D per day. It may be worth conducting blood work to determine how deficient you are in Vitamin D. This will determine how much you should supplement with. Most adults however find no negative effect by supplementing with >3000-5000IU during the winter months.
In addition to supplementation, whenever possible try to be outside when the sun is shining. This can be a challenge with the shorter days however even the smallest bit of sunshine on your face not only helps with vitamin D but will greatly enhance your mood. Sunlight on its own, even in the winter is essential to our health.
Taking Action
Vitamin D Supplementation
When purchasing any supplement, it is important to look for a brand that is of clinical grade. Avoid brands like Jamieson or Kirkland and go for brands like Designs For Health, Can Prev or Metagenics. You can order vitamin D and fish oil below with 15% off until Feb 28, 2025. Use code WINTER at check out.
Liquid Fish Oil by Designs For Health
Fish Oil Capsules by Designs For Health
Vitamin D by Designs For Health
The Randall Residences
298 Randall Street
Oakville, Ontario
L6J 1R1
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