The consequences of a vitamin D deficiency
Pharmacist Dirk | Founder Metis Supplements
Last updated: 21 October 2025
The days are getting shorter. You notice it in everything: waking up in the dark in the morning, coming home in the dark in the evening. Fatigue that doesn't go away after a good night's sleep. An increased susceptibility to colds. These are subtle signals your body gives when it lacks essential building blocks.
The answer often lies in something simple: too little sunlight means too little vitamin D.
Three essential processes that vitamin D supports
1. Immune system support
Vitamin D plays a direct role in the functioning of your immune system. It activates immune cells and helps your body respond to external threats. In the autumn and winter months, when colds and flu are more common, a healthy vitamin D status is extra important.
2. Energy and body recovery
Fatigue during the dark months is no coincidence. Vitamin D supports energy production in your cells and contributes to muscle recovery after exertion. A deficiency can lead to a persistent feeling of fatigue and reduced stamina, even if you get enough sleep.
3. Maintenance of strong bones and teeth
The most well-known function of vitamin D: it helps with the absorption of calcium and phosphorus from food, which is essential for maintaining strong bones and healthy teeth. Especially during periods without sufficient sunlight, your body needs external support to ensure this process runs optimally.
How Metis can support you
Metis Essentials Vitamin D contains a highly absorbable dose of vitamin D3. Our formulas are designed for daily support, ensuring your body consistently receives what it needs.