It matters because it's about our health!
The Sun and Vitamin D: How to Balance the Benefits and Risks?
Vitamin D production is directly linked to sun exposure. Unfortunately, along with the "beneficial" rays, those that damage our skin also reach us. Sunlight contains two main types of ultraviolet rays:
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UVB rays: The only ones that trigger vitamin D synthesis in the skin. However, they also cause painful sunburns.
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UVA rays: They easily pass through clouds and glass, and regular clothing only weakens them. They are responsible for skin aging (wrinkles and spots).
Important: Both types of rays (UVA and UVB) increase the risk of skin cancer, making sun protection critical!
The Paradox of "Safe" Sun
For most of the day, vitamin D production from the sun is practically zero. The reason is that in the morning and evening, the atmosphere blocks the delicate UVB rays. They are at their strongest only around midday (between 11:00 AM and 3:00 PM) on a sunny summer day.
This is the exact moment when our body can "consume" vitamin D (only 10–15 minutes are needed). But if we have already applied a heavy sunscreen, we block the UVB rays and the synthesis stops entirely.
What is the Solution?
Smart management of your sun exposure. This is where UV protection shirts (UPF 50+) come in, which you can easily find in specialized water sports stores. They effectively block over 98% of harmful UVA and UVB rays without any chemicals.
The formula is simple: Expose bare skin to the sun at midday for 10–15 minutes to get your dose of vitamin D, then put on your UV shirt to stay perfectly protected for the rest of the day.