2026-09-02 · Seasonal offers
Why autumn is the right time to test vitamin D in Canada
Canada's latitude means that from roughly October through March, the angle of the sun is too low for skin to synthesise meaningful amounts of vitamin D from UV-B radiation. By the time most patients notice symptoms of deficiency. Fatigue, low mood, muscle weakness. Their levels have often been declining for months. Testing in September or early October gives you a baseline while levels are still at their seasonal peak, and enough time to start supplementation before the drop becomes significant. Read more →