The Role of "Nano-Particles" in Sunscreen Formulation

SadaNews - Sunscreen contributes to skin care and protects it from burns and premature aging, in addition to safeguarding DNA. Therefore, its formulation is under careful scrutiny in global laboratories. Recently, questions have been raised regarding the impact of one of its components known as "nano-particles" or "nanoparticles."

What are the reasons for questioning these components?

The Role of These Particles

The term "nanoparticles" refers to particles that are smaller than 100 nanometers, or one billionth of a meter. Their presence in the ingredient list of some sunscreens is explained by their small size, which contributes to a comfortable formulation and a pleasant texture.

"Nanoparticles" are found only in sunscreens that use mineral filters, the most common being zinc oxide and titanium dioxide, which are white powders capable of reflecting long and medium ultraviolet rays, thereby protecting the skin from their harmful effects.

Using these powders would leave a white appearance on the skin. Here lies the importance of nanoparticles, which reduce the size of these powders' particles, preventing the filters from leaving white residues while maintaining their effectiveness in protecting against the sun and resisting light.

Risks of Inclusion in Creams

The small size of "nanoparticles" raises concerns about their potential change in properties, requiring verification of their safety.

It is mistakenly assumed that nano-particles in sunscreen penetrate the skin and reach the bloodstream. This has not been scientifically proven, and health authorities globally have allowed their use in mineral sunscreens, indicating they do not pose health risks.

Dermatologists point to the dangers of inhaling nano-particles, potentially causing lung damage and cancer. However, mineral sunscreens containing them are not sold in spray form, preventing inhalation.

Chemical Filters or Mineral Filters?

Whether you choose chemical or mineral sunscreen, what is certain is that protecting the skin from ultraviolet rays is a health-conscious and important step.

It is worth mentioning that each category of these filters has its advantages in terms of texture. Chemical filters are considered more user-friendly, while mineral filters tend to leave white marks on the skin, especially after swimming and sweating.

On the other hand, it is preferable to use mineral filters in facial sun protection products, especially since chemical filters can irritate the eyes. Many people suffer from allergies to them even when avoiding application around the eye area.

Experts indicate that it is not always necessary to choose between mineral and chemical filters. Many cosmetic laboratories combine both to achieve an effective formulation that combines the reflective effect of mineral filters with the UV absorption provided by chemical filters, in a comfortable and effective composition.