Vitamina D3: l’alleato silenzioso per salute e performance atletica

Vitamin D3 (cholecalciferol) is one of the most extensively studied micronutrients due to its impact on multiple physiological systems: not only the skeletal system, but also immune function, muscle function, hormonal balance, and inflammation regulation. It is now widely recognized as one of the most deficient vitamins in the population, with implications ranging from overall health to sports performance.

What is Vitamin D and why is it so important?

Vitamin D is a fat-soluble vitamin available in two main forms:

• Vitamin D2 (ergocalciferol): plant-based, less stable
• Vitamin D3 (cholecalciferol): more effective, synthesized by the skin through sunlight exposure

Once activated by the liver and kidneys, vitamin D regulates over 900 genes, with effects far beyond bone metabolism.

Main functions of vitamin D3

• Supports bone and dental health
• Regulates blood calcium levels
• Ensures proper muscle contraction
• Strengthens the immune system

Natural sources of vitamin D: why are they often insufficient?

The body produces vitamin D3 when skin is exposed to UVB rays, but synthesis is highly variable due to:

• Geographic latitude and season
• Skin pigmentation and age
• Indoor lifestyle and sunscreen use

Dietary sources of vitamin D3 include fatty fish, eggs, liver, and fortified dairy, but average daily intake (<5 µg) is often too low.

Daily requirement: what do guidelines say?

The EU recommends 5 µg/day, but scientific societies (SINU, Endocrine Society) suggest 15–50 µg (600–2000 IU) in cases of:

• Low sun exposure
• Older adults or high BMI
• Osteoporosis prevention

Vitamin D and sports: proven benefits

• Improves muscle strength
• Reduces risk of injury
• Boosts immune defense
• Enhances recovery and bone metabolism

A notable example is the Norwegian national cross-country ski team, which in 2010 adopted a structured vitamin D3 supplementation protocol, resulting in fewer infections and better neuromuscular performance.

When to supplement with vitamin D3?

Supplementation is particularly useful during:

• Winter months (October to April in Central Europe)
• Low outdoor exposure
• Aging population
• Indoor sports (swimming, gym)
• Serum levels below 30 ng/mL

The optimal dosage is 2000 IU/day (50 µg). According to EFSA, the safe upper limit (UL) is 100 µg (4000 IU).

EthicSport's approach: quality and safety

• 2000 IU of pure vitamin D3 per softgel
• Lipid-based formula with sunflower oil for optimal absorption
• Easy-to-swallow softgels
• Gluten-free and suitable for sensitive individuals
• Free from banned substances (steroids, SARMs, stimulants)

Conclusion: why choose EthicSport vitamin D3

Vitamin D3 is not just a vitamin: it is a key modulator of physical efficiency, immune resilience, and bone health. Conscious supplementation is a smart prevention strategy, especially during low-sunlight months or for those at risk of deficiency. EthicSport’s formula offers a technical, reliable, and effective solution — ideal for athletes and the general population alike.