Published: 11-Mar-2026
Vitamin D – why sunlight isn’t always enough
Despite local sunshine, Vitamin D deficiency persists. It’s vital for immunity and bones. Brunel Laboratoria offers support when sun isn't enough.
South Africa enjoys high levels of sunshine throughout the year, yet vitamin D deficiency remains relatively common. This highlights the importance of understanding how vitamin D is produced and why additional support may sometimes be necessary.
What is vitamin D?
Vitamin D is a fat-soluble vitamin that is produced in the skin following exposure to ultraviolet B (UVB) radiation from sunlight. It plays an important role in maintaining overall health, particularly in supporting immune function and bone health.
Why deficiency still occurs
Despite favourable environmental conditions, several factors can limit vitamin D production:
- Sunscreen use reduces UVB absorption
- Indoor lifestyles limit sun exposure
- Seasonal variation affects UV intensity
- Skin pigmentation influences vitamin D synthesis
South African research indicates that vitamin D deficiency is not uncommon, particularly in urban populations and individuals with limited sun exposure.
Vitamin D and immune function
Vitamin D contributes to immune system regulation by supporting the activity of immune cells such as T-cells. These cells play a role in identifying and responding to pathogens.
Low vitamin D levels have been associated with an increased susceptibility to respiratory infections.
Role in bone health
Vitamin D supports calcium absorption in the body, which is essential for maintaining strong bones and teeth. Without adequate vitamin D, calcium cannot be effectively utilised.
Maintaining healthy vitamin D levels
- Sensible sun exposure
- Balanced nutrition
- Supplementation where appropriate
Where Brunel fits in
Brunel Basics Vitamin D3 may assist in maintaining adequate vitamin D levels throughout the year.
Conclusion
Maintaining optimal vitamin D levels may require a proactive approach, even in sun-rich environments. Understanding individual needs is key to supporting long-term health.
References
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