You know the SPF (Sun Protection Factor) of your sunscreen, but do you know the UPF (Ultraviolet Protection Factor) of your clothes?

The difference between SPF (Sun Protection Factor) and UPF (Ultraviolet Protection Factor) is mainly in their usage and application.

1. SPF (Sun Protection Factor):

- Used for sunscreens and sun protection products.

- Measures the level of protection against UVB rays, which are responsible for sunburn and can contribute to skin cancer.

- For example, a sunscreen with an SPF of 30 means that you can theoretically spend 30 times more time in the sun without burning compared to not using protection. However, this depends on several factors, including skin type and the application of the product.

2. UPF (Ultraviolet Protection Factor):

- Used for clothing and textiles.

- Measures the level of protection of tissues against UVA and UVB rays.

- A UPF of 50 means that only 1/50th of UV light can pass through the fabric, providing high UV protection. It also means that the garment blocks approximately 98% of UV rays.

- A UPF of 15 is the minimum value to be considered "sun protection"

In short, SPF is used for products applied to the skin, while UPF is used for clothing and textiles that protect against ultraviolet rays.

While UV radiation is harmful, UVB rays play a vital role in the synthesis of vitamin D in our bodies. Here’s how it works:

1. Synthesis of vitamin D:

- When the skin is exposed to the sun's UVB rays, a chemical process is triggered. UVB rays transform a compound present in the skin, 7-dehydrocholesterol, into vitamin D3 (cholecalciferol).
- Vitamin D3 is then converted in the liver and kidneys to its active form, calcitriol, which is essential for several bodily functions.
2. Role of vitamin D:
- Vitamin D is crucial for the absorption of calcium and phosphorus, two minerals necessary for healthy bones and teeth.
- It also plays a role in the functioning of the immune system, regulating cell growth and reducing inflammation.
3. Alternative sources of vitamin D:
- Although sun exposure is an important source of vitamin D, it can also be obtained through certain foods (such as oily fish, eggs, and fortified dairy products) and supplements.
CONCLUSIONS
Use everything, abuse nothing: It is very important to get enough vitamin D to be healthy and it is also crucial to protect yourself against the harmful effects of UV rays with sunscreens with an SPF adapted to your skin, as well as clothing with a minimum UPF of 15 (the minimum value to be able to have the designation "Sun Protection").
Author: Luc Dessauvages

 

Luc Dessauvages