Vitamin D in Estonia: Why It's Crucial in Winter

Vitamin D in Estonian Climate

Estonia is located at 59° latitude - this means from October to March, the sun isn't high enough for skin to produce vitamin D.

Why is Vitamin D Important?

Vitamin D affects:

• Bone health and strength
• Immune system function
• Muscle strength and recovery
• Mood and energy
• Testosterone levels in men

Deficiency Symptoms

• Fatigue and low energy
• Frequent colds and infections
• Muscle weakness
• Bone pain
• Depression and low mood
• Slow recovery from training

How Much Vitamin D Do You Need?

Note: Estonians have average vitamin D levels 40-50% lower than recommended!

Best Sources

Food

• Fatty fish (salmon, mackerel) - 400-1000 IU/100g
• Egg yolk - 40 IU/egg
• Fortified milk - 100 IU/glass
• Mushrooms - 100-400 IU/100g

Supplements

• Vitamin D3 (cholecalciferol) - preferred form
• Vitamin D2 (ergocalciferol) - plant-based, less effective

When to Take?

• In the morning with fatty food
• Vitamin D is fat-soluble - absorption is better with fat
• Take with K2 vitamin for better calcium absorption

Vitamin D and Training

Studies show optimal vitamin D levels:

• Increase muscle strength up to 20%
• Speed up recovery
• Reduce injury risk
• Improve athletic performance

Our Recommendation

For Estonian climate we recommend:
1. October to April take 4000 IU vitamin D3 daily
2. Add vitamin K supplements (100-200 mcg)
3. Take in morning with fatty food
4. Check blood levels 1x per year

Optimal blood level: 40-60 ng/ml (100-150 nmol/l)

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Browse our vitamin D selection at MaxFit.ee →

See also:

• Vitamin D Deficiency in Estonia: 6 Months of Darkness and What to Do About It
• Best Vitamin D Supplements for Athletes 2026
• Magnesium and Vitamin D: Why Take Them Together and How to Dose Correctly

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Read more: Vitamin D: A Science-Based Guide